Symptom Charts

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart - Air Leak and Wind Noise

Condition	Possible Sources	Action
Air leak around the door perimeter	Loose fit seal	PINCH the seal carrier to improve retention on the seal flange.
	Seal installed incorrectly	INSTALL the seal correctly.
	Door misaligned	ALIGN the door correctly. CHECK the door gaps and fit in the door opening and ADJUST as necessary.
	Scuff plate installed incorrectly	INSTALL the scuff plate correctly.
	Seal or seal pin-type retainers damaged	INSTALL a new seal.
Air leak around a glass run	Door glass misaligned	ADJUST the door glass.
	Glass run installed incorrectly	ADJUST the glass run. INSERT foam in the glass run carrier.
	Leak path behind a glass run	INSTALL foam rope behind the glass run.
	Glass run channel spread wide	PINCH the glass run channel to reduce the size of the opening.
	Blow-out clip bent or contacting the door glass	ADJUST the blow-out clip or INSTALL a new glass run/blow-out clip molding assembly.
	Glass run damaged	INSTALL a new glass run.
Air leak at the inner belt line	Belt line seal installed incorrectly on the flange	ADJUST the seal. (Do not bend the flange.)
	Belt line seal integrated with door trim installed incorrectly (no glass contact)	INSTALL the door trim correctly.
	No contact with the side glass	ADJUST the door glass.
	No contact with glass runs at both ends of the belt line seal	ADJUST the belt line seal or ADD foam at the seal ends.
	Belt line seal damaged	INSTALL a new seal.
Air leak at the outer belt line	Belt line seal installed incorrectly on the flange (no glass contact)	ADJUST the seal.
	Belt line seal does not contact the glass	ADJUST the door glass.
	No contact with the glass runs at both ends of the belt line seal	ADJUST the belt line seal/ADD foam at the seal ends.
	Belt line seal damaged	INSTALL a new seal.
Draft at the inner door handle/speaker opening	Hole in the watershield	SEAL the hole with a suitable tape.
	Watershield misaligned	ALIGN the watershield correctly. INSTALL a new watershield if the pressure sensitive adhesive fails.
	Exterior door handle seal misaligned/damaged	ALIGN the seal correctly or INSTALL a new seal as necessary.
Wind noise from the exterior rear view mirror	Exterior rear view mirror housing misaligned	ALIGN with the edges shingled correctly and no gaps.
	Mirror sail gasket folded/misaligned	INSTALL with the gasket unfolded and aligned correctly.
	Mirror housing trim cap installed incorrectly	INSTALL with the edges shingled to the air flow.
	Air leak through the mirror housing hinge	Fully ENGAGE the mirror into its operating position/USE foam to block the air path through the hinge.
	Inner sail trim installed incorrectly	INSTALL the sail trim correctly/ADJUST the door trim.
	Inner sail gasket/barrier installed incorrectly	INSTALL the trim cover with the gasket/barrier aligned correctly.
	Air path through the wiring bundle/fastener access holes	BLOCK the air path(s) with foam/tape.
	Exposed fastener access hole on the mirror housing/sail	INSTALL a new cap if it is missing.
Air leak around the perimeter of fixed glass	Gaps in the adhesive bead	APPLY an approved adhesive. If the windshield is the source, RESEAL the windshield. REFER to GLASS, FRAMES AND MECHANISMS article.
	Air traveling up the windshield molding along the A-pillar	INSTALL foam rope the full length of the A-pillar.
	Windshield/backlite misaligned or not installed correctly	INSTALL the windshield/backlite correctly.
	Rear hood seal at the base of the windshield misaligned/damaged	ALIGN the seal correctly or INSTALL a new seal as necessary.
Air leak at the cowl	Cowl gasket misaligned/damaged	ALIGN the seal correctly or INSTALL a new seal as necessary.
Air leak around the liftgate perimeter	Loose fit seal	PINCH the seal carrier to improve retention on the seal flange or INSERT foam in the carrier.
	Seal misaligned	INSTALL the sea correctly.
	Liftgate misaligned	ALIGN the liftgate. CHECK the liftgate fit in the body opening and ADJUST as necessary.
	Scuff plate misaligned	INSTALL the scuff plate correctly.
	Seal or seal pin-type retainers damaged	INSTALL a new seal.
Air leak around the liftgate flip window perimeter	Loose fit seal	PINCH the seal carrier to improve the retention to the seal flange.
	Seal misaligned	INSTALL the seal correctly.
	Glass misaligned	ALIGN the glass correctly.
	Seal damaged	INSTALL a new seal.
Wind noise from the antenna	Shape of the antenna	INSTALL an antenna boot or a spiral antenna.
	Air leak around the antenna cable access hole	INSPECT the antenna access hole grommet. REPAIR as necessary.
Air leak from the closed roof opening panel	Seal installed incorrectly	INSTALL the seal correctly.
	Roof opening panel glass/door misaligned	ALIGN the roof opening panel glass/door correctly.
	Roof opening panel damaged	INSTALL a new roof opening panel. REFER to ROOF OPENING PANEL article.
Buffeting from an open roof opening panel	Wind deflector inoperative/damaged	REPAIR or INSTALL a new wind deflector as necessary. REFER to ROOF OPENING PANEL article.
	Wind deflector height incorrect	ADJUST the wind deflector higher.
Wind noise created by airflow over or behind body panels	Fender splash shield misaligned	ALIGN the fender splash shield correctly.
	Body panel misaligned (exposed edge)	ALIGN the appropriate body panel correctly.
	Hood misaligned (front margin)	CHECK the hood gaps and fit. ADJUST the hood as necessary.
	Front grille edge noise	APPLY foam in the hollow areas behind the louvers.
Wind noise created by the grille opening panel	Grille relationship to the leading edge on the hood	ADJUST the grille opening panel forward to eliminate the wind noise.
	Sharp edges due to material imperfections	REMOVE the sharp edges (no damage to visible surface).
Wind noise from the air extractor	Air extractor housing seated incorrectly	INSTALL the air extractor housing correctly.
	Air extractor housing or flaps damaged	INSTALL a new air extractor.
Noise from the roof rack	Roof rack rails or crossbars loose	TIGHTEN the fasteners.
	Roof rack fasteners missing	INSTALL the approved fasteners.
	Roof rack crossbars installed backward	INSTALL the crossbars correctly.
	Roof rack rub strips partially lifting from the roof	APPLY adhesive or fasteners or INSTALL new rub strips as necessary.
	Roof rack gaskets loose or misaligned	INSTALL the gasket correctly.
Wind noise from the bug shield/exterior windshield sun visor	Turbulence created by the location and shape	REMOVE per customer direction if it is a dealer installed option.

Symptom Chart-Driveline Noise/Vibration

Condition	Possible Sources	Action
Axle howling or whine - front or rear axle	Axle lubricant low	CHECK the lubricant level. FILL the axle to specification.
	Axle housing damage	INSPECT the axle housing for damage. REPAIR or INSTALL a new axle as necessary. REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
	Damaged or worn wheel bearings or axle bearings	CHECK for abnormal wheel bearing play or roughness. Refer to Wheel Bearing Check . ADJUST or INSTALL new wheel bearings as necessary.
	Damaged or worn differential ring and pinion	REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
	Damaged or worn differential side or pinion bearings	REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
	Transfer case housing or internal gear damage or low lubricant	INSPECT the transfer case for damage. CHECK the lubricant level and FILL the transfer case to specification. REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
Driveline clunk - loud clunk when shifting from reverse to drive	Incorrect axle lubricant level	CHECK the lubricant level. FILL the axle to specification.
	Excessive backlash in the axle	REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
	Damaged or worn pinion bearings	REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
	Damaged or worn universal joints (U-joints)	INSPECT the U-joints for wear or damage. INSTALL new U-joints as necessary. REFER to DRIVESHAFT article.
	Loose suspension components	INSPECT the suspension for damage or wear. REPAIR or INSTALL new components as necessary. REFER to FRONT SUSPENSION article for the front suspension or REAR SUSPENSION article for the rear suspension.
	Broken powertrain mounts	INSPECT the powertrain mounts. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or ENGINE - 2.3L HYBRID article for the Hybrid. INSTALL new mounts as necessary.
	Idle speed is too high	CHECK for the correct idle speed.
Driveline clunk - occurs as the vehicle starts to move forward following a stop	Worn driveshaft constant velocity (CV) joint or U-joints with excessive play	INSPECT the CV joint and U-joints for a worn condition. INSTALL a new driveshaft or U-joints as necessary. REFER to DRIVESHAFT article.
	Loose rear axle mount	CHECK the axle for loose bolts. TIGHTEN to specification. REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
Driveline clunk (front wheel drive [FWD] vehicles) - occurs during acceleration or from cruise to coast/deceleration	Damaged or worn inner constant velocity (CV) joint	INSPECT the inner CV joint and boot. REPAIR or INSTALL a new CV joint as necessary. REFER to FRONT DRIVE HALFSHAFTS article.
Driveline clunk (all wheel drive [AWD] vehicles)	Transfer case Interactive torque	CHECK the AWD engagement system. REPAIR or INSTALL new components as necessary. REFER to FOUR WHEEL DRIVE (4WD) SYSTEMS article.
Clicking, popping, or grinding - occurs while the vehicle is turning	Inadequate or contaminated lubrication in the constant velocity (CV) joints	CHECK the CV boots and joints for wear or damage. REPAIR or INSTALL new components as necessary. REFER to FRONT DRIVE HALFSHAFTS article.
	Another component contacting the halfshaft	CHECK the halfshafts and the area around the halfshafts. REPAIR as necessary.
	Brake components	INSPECT the front brakes for wear or damage. REPAIR as necessary. REFER to FRONT DISC BRAKE article.
	Steering components	INSPECT the drag link, inner and outer tie-rods and the idler arm for wear or damage. REPAIR as necessary. REFER to STEERING SYSTEM - GENERAL INFORMATION article.
	Suspension components	INSPECT the upper and lower ball joints for wear or damage. REPAIR as necessary. REFER to FRONT SUSPENSION article for front ball joints or REAR SUSPENSION article for rear ball joints.
	Damaged or worn wheel bearings	CHECK for abnormal wheel bearing play or roughness. REFER to Wheel Bearing Check . ADJUST or INSTALL new wheel bearings as necessary.
Clicking or snapping - occurs when accelerating around a corner	Damaged or worn outboard constant velocity (CV) joint	INSPECT the outboard CV joint and boot. REPAIR or INSTALL a new CV joint as necessary. REFER to FRONT DRIVE HALFSHAFTS article.
High pitched chattering - noise from the rear axle when the vehicle is turning	Incorrect or contaminated lubricant	CHECK the vehicle by driving in tight circles (5 clockwise, 5 counterclockwise). FLUSH and REFILL with the specified rear axle lubricant and friction modifier as necessary.
	Damaged or worn differential (differential side gears and pinion gears)	REFER to REAR DRIVE AXLE/DIFFERENTIAL article for the rear axle.
Buzz - buzzing noise is the same at cruise or coast/deceleration	Damaged or worn tires	CHECK for abnormal tire wear or damage. INSTALL a new tire as necessary. REFER to WHEELS AND TIRES article.
	Incorrect driveline angles	CHECK for correct driveline angles. REPAIR as necessary. REFER to Driveline Angles.
Rumble or boom - noise occurs at coast/deceleration, usually driveshaft speed-related and noticeable over a wide range of speeds	Driveshaft is out-of-balance	CHECK the driveshaft for damage, missing balance weights or undercoating. REPAIR or INSTALL a new driveshaft as necessary.
	U-joints are binding or seized	ROTATE the driveshaft and CHECK for rough operation or seized U-joints. INSTALL new U-joints as necessary. REFER to DRIVESHAFT article.
	Excessive pinion flange runout	CARRY OUT a runout check. REPAIR as necessary. REFER to Pinion Flange Runout Check.
Grunting - normally associated with a shudder experienced during acceleration from a complete stop	Driveshaft constant velocity (CV) joint binding	CLEAN the CV joint and INSTALL a new driveshaft as necessary. REFER to DRIVESHAFT article.
	Loose rear axle mount bolts or suspension fasteners	INSPECT the rear suspension and axle. TIGHTEN the fasteners to specification.
Howl - can occur at various speeds and driving conditions. Affected by acceleration and deceleration	Incorrect ring and pinion contact, incorrect bearing preload or gear damage	REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
Chuckle - heard at coast/deceleration. Also described as a knock	Incorrect ring and pinion contact or damaged teeth on the coast side of the ring and pinion	REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
Knock - noise occurs at various speeds. Not affected by acceleration or deceleration	Gear tooth damage to the drive side of the ring and pinion	REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
Scraping noise - a continuous low pitched noise starting at low speeds	Worn or damaged pinion bearings	REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
Driveline shudder - occurs during acceleration from a slow speed or stop	Rear drive axle assembly mispositioned	CHECK the axle mounts and the rear suspension for damage or wear. REPAIR as necessary.
	Loose rear axle bolts	CHECK the rear axle for loose bolts. TIGHTEN the bolts to specification. REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
	Incorrect or high constant velocity (CV) joint operating angle	INSPECT for damage. REPAIR as necessary.
	Damaged or worn front suspension components	CHECK for a loose stabilizer bar, damaged or loose strut/strut bushings or loose or worn ball joints. INSPECT the steering linkage for wear or damage. REPAIR or INSTALL new components as necessary. REFER to FRONT SUSPENSION article.
	Driveline angles out of specification	CHECK for correct driveline angles. REPAIR as necessary.
	U-joints binding or seized	ROTATE the driveshaft and CHECK for rough operation or seized U-joints. INSTALL new U-joints as necessary. REFER to DRIVESHAFT article.
	Binding or damaged driveshaft CV joint	INSPECT the driveshaft CV joint and coupling shaft for wear or damage. INSTALL a new driveshaft as necessary. REPAIR as necessary. REFER to DRIVESHAFT article.
Driveline vibration - occurs at cruising speeds	Worn U-joints	CHECK for wear or incorrect seating. INSTALL new U-joints as necessary. REFER to DRIVESHAFT article.
	Worn or damaged driveshaft center bearing support	CHECK the insulator for damage or wear. ROTATE the driveshaft and CHECK for rough operation. INSTALL a new center bearing support as necessary. REFER to DRIVESHAFT article.
	Loose axle pinion flange bolts	INSPECT the axle pinion flange. TIGHTEN the pinion flange bolts to specification. REFER to DRIVESHAFT article.
	Excessive axle pinion flange runout	CARRY OUT a runout check. REPAIR as necessary. REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
	Driveshaft is out-of-balance	CHECK the driveshaft for damage, missing balance weights or undercoating. CHECK the driveshaft balance. CARRY OUT a driveline vibration test. REFER to DRIVESHAFT article. REPAIR as necessary.
	Binding or damaged driveshaft constant velocity (CV) joint	INSPECT the driveshaft CV joint for wear or damage. INSTALL a new driveshaft as necessary. REFER to DRIVESHAFT article.
	Excessive driveshaft runout	CARRY OUT a runout check. REFER to DRIVESHAFT article. REPAIR as necessary.
	Incorrect lateral and radial tire/wheel runout	INSPECT the tires and wheels. MEASURE the tire runouts. REPAIR or INSTALL new components as necessary. REFER to WHEELS AND TIRES article.
	Driveline angles out of specification	CHECK for correct driveline angles. REPAIR as necessary. REFER to Driveline Angles.
	Incorrectly seated CV joint in the wheel hub	CHECK the outer CV joint for correct seating into the hub. REPAIR as necessary. REFER to FRONT DRIVE HALFSHAFTS article for the front CV joints or REAR DRIVE HALFSHAFTS article for the rear CV joints.

Symptom Chart - Engine Noise/Vibration

Condition	Possible Sources	Action
Grinding noise - occurs during engine cranking	Incorrect starter motor mounting	INSPECT the starter motor for correct mounting. REPAIR as necessary. REFER to STARTING SYSTEM article.
	Starter motor	CHECK the starter motor. REPAIR or INSTALL a new starter motor as necessary. REFER to STARTING SYSTEM article.
	Incorrect starter motor drive engagement	INSPECT the starter motor drive and flywheel/flexplate for wear or damage. INSTALL a new starter motor drive or flywheel/flexplate as necessary. REFER to STARTING SYSTEM article.
Engine ticking noise	Fuel injector Fuel line Oil pump Valve lifter Belt tensioner Water pump Obstruction of cooling fan	Go to Pinpoint Test A .
Engine drumming noise - normally accompanied by vibration	Powertrain mount	CARRY OUT the Powertrain/Drivetrain Mount Neutralizing procedure.
	Damaged or misaligned exhaust system	INSPECT the exhaust system for loose or broken clamps and brackets. CARRY OUT the Exhaust System Neutralizing procedure.
Whistling noise - normally accompanied with poor idle condition	Air intake system	CHECK the air intake ducts, air cleaner, throttle body and vacuum hoses for leaks and correct fit. REPAIR or ADJUST as necessary. REFER to INTAKE AIR DISTRIBUTION AND FILTERING - 2.3L article for the 2.3L engine, INTAKE AIR DISTRIBUTION AND FILTERING - 3.0L (4V) article for the 3.0L engine, or INTAKE AIR DISTRIBUTION AND FILTERING - HYBRID article for the Hybrid.
Clunking noise	Water pump has excessive end play or imbalance	CHECK the water pump for excessive end play. INSPECT the water pump for imbalance with the drive belt off. INSTALL a new water pump as necessary. REFER to ENGINE COOLING article or ENGINE COOLING - HYBRID article for the Hybrid.
	Generator has excessive end play	CHECK the generator for excessive end play. REPAIR or INSTALL a new generator. REFER to GENERATOR AND REGULATOR article.
Pinging noise	Exhaust system leak	INSPECT the exhaust system for leaks or damage. REPAIR as necessary. REFER to EXHAUST SYSTEM article.
	Gasoline octane too low	VERIFY with customer the type of gasoline used. CORRECT as necessary.
	Knock sensor operation	CHECK the knock sensor. INSTALL a new knock sensor as necessary. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L article for the 2.3L engine orELECTRONIC ENGINE CONTROLS - HYBRID article for the Hybrid.
	Incorrect spark timing	CHECK the spark timing. REPAIR as necessary.
	High operating temperature	INSPECT the cooling system for leaks. CHECK the coolant level. REFILL as necessary. CHECK the coolant for the correct mix ratio. DRAIN and REFILL as needed. VERIFY the engine operating temperature is within specifications. REPAIR as necessary.
	Spark plug	CHECK the spark plugs. REPAIR or INSTALL new spark plugs as necessary.
	Catalytic converter	Acceptable noise.
Knocking noise - light knocking noise, also described as piston slap. Noise is most noticeable when the engine is cold with light to medium acceleration. The noise disappears as the engine warms	Excessive clearance between the piston and the cylinder wall	Engine cold and at high idle. Using an EngineEAR, pull a spark plug or fuel injector connector until the noise goes away. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or ENGINE - 2.3L HYBRID article for the Hybrid to continue diagnosis.
Knocking noise - light double knock or sharp rap sound. Occurs mostly with a warm engine at idle or low speeds in drive. Increases in relation to engine load. Associated with a poor lubrication history	Excessive clearance between the piston and the piston pin	REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or ENGINE - 2.3L HYBRID article for the Hybrid to continue diagnosis.
Knocking noise - light knocking noise. The noise is most noticeable when the engine is warm. The noise tends to decrease when the vehicle is coasting or in neutral	Excessive clearance between the connecting rod bearings and the crankshaft	Engine warm and at idle. Using an EngineEAR, PULL a spark plug or fuel injector connector until the noise goes away. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or ENGINE - 2.3L HYBRID article for the Hybrid to continue diagnosis.
Knocking noise - deep knocking noise. The noise is most noticeable when the engine is warm, at lower rpm and under a light load and then at float	Worn or damaged crankshaft main bearings	REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or ENGINE - 2.3L HYBRID article for the Hybrid to continue diagnosis.
Knocking noise - occurs mostly with a warm engine at light/medium acceleration	Spark plugs	CHECK the spark plugs for damage or wear. INSTALL new spark plugs as necessary.
	Carbon accumulation in combustion chamber	REMOVE carbon from the combustion chamber.
Whine or moaning noise	Air intake system	CHECK the air cleaner and ducts for correct fit. INSPECT the air intake system for leaks or damage. REPAIR as necessary.
	Generator electrical field or bearings	CARRY OUT a generator load test. REPAIR or INSTALL a new generator as necessary. REFER to GENERATOR AND REGULATOR article.
Drone type noise	Exhaust system	CARRY OUT the Exhaust System Neutralizing procedure. REPAIR as necessary.
	A/C compressor	CHECK for noise with the vehicle at constant speeds. CYCLE the compressor on and off and listen for a change in pitch. REPAIR as necessary. REFER to CLIMATE CONTROL article.
	Powertrain mounts	CARRY OUT the Powertrain/Drivetrain Mount Neutralizing procedure.
Sputter type noise - noise worse when the vehicle is cold, lessens or disappears when the vehicle is at operating temperature	Damaged or worn exhaust system components	INSPECT the exhaust system for leaks or damage. REPAIR as necessary. REFER to EXHAUST SYSTEM article.
Rattling noise - noise from the upper engine (valve train). Worse when the engine is cold	Low oil level	CHECK the oil level. FILL as necessary.
	Thin or diluted oil	INSPECT the oil for contamination. If the oil is contaminated, CHECK for the source. REPAIR as necessary. CHANGE the oil and filter.
	Low oil pressure	CARRY OUT an oil pressure test. If not within specifications, REPAIR as necessary. REFER to ENGINE SYSTEM - GENERAL INFORMATION article.
	Worn rocker arms/fulcrums or followers	CARRY OUT a valve train analysis. INSTALL new valve train components as necessary. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or ENGINE - 2.3L HYBRID article for the Hybrid.
	Worn valve guides	CARRY OUT a valve train analysis. INSTALL new valve guides as necessary. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or ENGINE - 2.3L HYBRID article for the Hybrid.
	Excessive runout of valve seats on the valve face	CARRY OUT a valve seat runout test. INSPECT the valve face and seat. INSTALL new valves as necessary. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or ENGINE - 2.3L HYBRID article for the Hybrid.
Rattling noise - from the bottom of the vehicle	Loose muffler shields or catalytic converter shields	CHECK the exhaust system for loose exhaust shields. REPAIR as necessary. REFER to EXHAUST SYSTEM article.
Thumping noise - from the bottom of the vehicle, worse at acceleration	Exhaust pipe/muffler grounded to chassis	CHECK the exhaust system to chassis clearance. CHECK the exhaust system hangers for damage. REPAIR as necessary. REFER to EXHAUST SYSTEM article.
Whoosh - occurs during light vehicle acceleration. Heard inside the vehicle	Throttling late, creating turbulence transmitted through the plastic manifold	CHECK for leaks or a missing seal in the dash panel.
Engine vibration - increases intensity as the engine rpm is increased	Engine out-of-balance	CARRY OUT the Neutral Engine Run-Up (NERU) Test. ROTATE the torque converter, 120° for 3-bolt or 180° for 4-bolt. INSPECT the torque converter pilot outer diameter to crankshaft pilot inner diameter. REPAIR as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
Engine vibration - is felt with increases and decreases in engine rpm	Strain on the exhaust mounts	CARRY OUT the Exhaust System Neutralizing procedure. REPAIR as necessary.
	Damaged or worn powertrain/drivetrain mounts	CHECK the powertrain/drivetrain mounts for damage. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, ENGINE - 2.3L HYBRID article for the Hybrid, AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article for the automatic transmission, or AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article for the electronically controlled continuously variable transmission (eCVT). REPAIR as necessary.
	Engine or transmission grounded to chassis	INSPECT the powertrain/drivetrain for correct clearances. REPAIR as necessary.
Engine vibration - vibration felt at all times	Excessive engine pulley runout	CARRY OUT the Engine Accessory Test. INSTALL a new engine pulley as necessary. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or ENGINE - 2.3L HYBRID article for the Hybrid.
	Damaged or worn accessory component	CARRY OUT the Engine Accessory Test. REPAIR or INSTALL a new component as necessary.
Accelerator pedal vibration - felt through the pedal as a buzz	Throttle cable loose or misrouted	INSPECT the throttle cable. REPAIR as necessary. REFER to ACCELERATION CONTROL article for the 2.3L or 3.0L engine, or ACCELERATION CONTROL - HYBRID article for the Hybrid.
Engine vibration - mostly at coast/neutral coast. Condition improves with vehicle acceleration	Combustion instability	CHECK the ignition system. INSTALL new components as necessary. REFER to section ENGINE IGNITION - 2.3L article for the 2.3L engine or ENGINE IGNITION - 3.0L (4V) article for the 3.0L engine.
Engine vibration or shudder - occurs with light to medium acceleration above 56 km/h (35 mph)	Worn or damaged spark plugs	INSPECT the spark plugs for cracks, high resistance or broken insulators. INSTALL a new spark plug(s) as necessary.
	Plugged fuel injector	REPAIR or INSTALL a new injector as necessary. REFER to FUEL CHARGING AND CONTROLS - 2.3L article for the 2.3L engine, FUEL CHARGING AND CONTROLS - 3.0L (4V) article for the 3.0L engine, or FUEL CHARGING AND CONTROLS - HYBRID article for the Hybrid.
	Damaged spark plug wire	INSPECT the spark plug wires for damage. INSTALL a new spark plug wire(s) as necessary.
	Contaminated fuel	INSPECT the fuel for contamination. DRAIN the fuel system and refill.
	Worn or damaged torque converter	CHECK the torque converter. INSTALL a new torque converter as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.

Symptom Chart - Idle Noise/Vibration

Condition	Possible Sources	Action
Idle air control (IAC) valve moan - occurs on throttle tip-out	IAC valve is contaminated with oil	Go to Component Tests.
Accessory drive belt chirp - occurs at idle or high idle, cold or hot. Most common occurrence is during humid weather	Accessory drive belt worn, or pulley is misaligned or loose	INSPECT for loose or misaligned pulleys. CHECK the drive belt for wear or damage. INSTALL new pulley(s)/accessory drive belt, as necessary. REFER to ACCESSORY DRIVE - 2.3L article for the 2.3L engine, ACCESSORY DRIVE - 3.0L (4V) article for the 3.0L engine, or ACCESSORY DRIVE - HYBRID article for the Hybrid.
Accessory drive bearing hoot - occurs at idle or high idle in cold temperatures of approximately +4°C (+40°F) or colder at the first start of the day	Accessory drive idler or tensioner pulley bearing is experiencing stick/slip between ball bearings and the bearing race	Go to Pinpoint Test B .
Power steering moan - occurs at high idle and possibly at idle during the first cold start of the day in temperatures of approximately -18°C (0°F) or colder. Noise can even be a severe screech for less than one minute in very cold temperatures of approximately -29°C (-20°F) or colder	High fluid viscosity or plugged reservoir screen in the power steering reservoir starves pump causing cavitation	Go to Pinpoint Test C .
Generator whine - during high electrical loads at idle or high idle, a high pitch whine or moan is emitted from the generator	Generator electrical field noise	Using an EngineEAR, PROBE near the generator housing. LISTEN for changes in the noise level while changing the electrical loads (such as rear defrost, headlamps, etc.). CARRY OUT a generator load test. If the system passes the load test, the noise is from the generator bearings. INSTALL a new generator. REFER to GENERATOR AND REGULATOR article.
Drumming noise - occurs inside the vehicle during idle or high idle, hot or cold. Very low-frequency drumming is very rpm dependent	Exhaust system vibration excites the body resonances inducing interior noise Engine vibration excites the body resonances inducing interior noise	Go to Pinpoint Test D .
Hissing noise - occurs during idle or high idle that is apparent with the hood open	Vacuum leak or idle air control (IAC) valve flow noise	Use the Ultrasonic Leak Detector/EngineEAR to locate the source. Scan the air intake system from the inlet to each cylinder intake port. DISCARD the leaking parts, and INSTALL a new component.
	Idle air control (IAC) valve flow noise	Go to the Idle Air Control (IAC) Valve Component Test.
	Vehicles with a plastic intake manifold	Acceptable condition. Some plastic manifolds exhibit this noise, which is the effect of the plastic manifold.
Automatic transmission buzz or hiss	Incorrect driveline angles	CHECK for correct driveline angles. REPAIR as necessary. REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
	Worn or damaged main control solenoids or valves	Using a transmission tester, activate the solenoids to duplicate the sound. INSTALL new components as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article for the automatic transmission, or AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article for the electronically controlled continuously variable transmission (eCVT).
Manual transmission clutch release bearing whine. A change in noise pitch or loudness while applying the clutch pedal	Worn clutch release bearing	INSTALL a new clutch release bearing. REFER to CLUTCH article.
Heating, vacuum, and air conditioning (HVAC) system chirp - most audible inside the vehicle. Listen for a change in the noise pitch or loudness while changing the HVAC system blower speed	Damaged or worn HVAC blower bearing	INSTALL a new blower motor. REFER to AUXILIARY CLIMATE CONTROL - HYBRID article.
Air conditioning (A/C) clutch ticking - occurs when the compressor clutch engages	Acceptable noise Incorrect air gap	LISTEN to the clutch to determine if the noise occurs with clutch engagement. A small amount of noise is acceptable. If the noise is excessive, CHECK the A/C clutch air gap. INSPECT the A/C clutch for wear or damage. INSTALL a new clutch as necessary. REFER to CLIMATE CONTROL article.
Intermittent rattle or scraping/rubbing noise	Loose exhaust heat shield(s)	INSPECT the exhaust system for loose parts using a glove or clamps to verify the cause. REPAIR as necessary. REFER to EXHAUST SYSTEM article.
	Wiring, hose or other part interfering with accessory drive, drive belt or pulley	INSPECT the accessory drive system closely. VERIFY there is adequate clearance to all rotating components. REPAIR as necessary.
Engine ticking or knocking noise - occurs during idle or high idle during the first cold start of the day	Piston noise or valve train noise (bled down lifter/lash adjuster)	Go to Pinpoint Test E .
A continuous, speed-dependent rattle from the engine - occurs during idle or high idle during the first cold start of the day and disappears as the engine warms up	Piston noise or valve train noise (bled down lifter/lash adjuster)	Go to Pinpoint Test E .
Idle vibration - a low-frequency vibration (5-20 Hz) or mild shake that is felt through the seat/floorpan	Cylinder misfire	Using the scan tool, CHECK the ignition system. REFER to ENGINE IGNITION - 2.3L article for the 2.3L engine or ENGINE IGNITION - 3.0L (4V) article for the 3.0L engine.
	Engine or torque converter out of balance	VERIFY the torque converter to crankshaft pilot clearance is correct. REPAIR as necessary. RE-INDEX the torque converter on the flex plate by 120° for a 3-bolt converter or 180° for a 4-bolt converter. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article for the automatic transmission, or AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article for the electronically controlled continuously variable transmission (eCVT). RETEST the vehicle.
Idle vibration - a high-frequency vibration (20-80 Hz) or buzz that is felt through the steering wheel or seat	Exhaust system mounts bound up	VERIFY the concern occurs at the engine firing frequency. CHECK that the exhaust system vibrates at the same frequency as the engine. ADD 9-14 kg (20-30 lb.) to the tail pipe to test. CARRY OUT the Exhaust System Neutralizing procedure.
	Body mounts loose	INSPECT the body mounts. CARRY OUT a Neutral Engine Run-Up (NERU) Test. REPAIR as necessary.
	Power steering lines grounded out	VERIFY that the power steering lines are not contacting the chassis or each other. REPAIR as necessary.

Symptom Chart - Squeak and Rattle

Condition	Possible Sources	Action
Squeak - heard inside the vehicle when closing/opening the door	Insufficient lubrication on the door hinge or check strap	LUBRICATE the hinge or check strap
	Internal door components are loose, rubbing or misaligned	CHECK the inside of the door. TIGHTEN or ALIGN components as necessary. USE the Rotunda Squeak and Rattle Kit to isolate any rubbing components.
Squeak - heard inside the vehicle when closing/opening the window	Worn or damaged glass run/channel	REPAIR or INSTALL a new glass run/channel. REFER to GLASS, FRAMES AND MECHANISMS article.
Squeak - heard outside of vehicle when closing/opening the door	Exhaust shield rubbing against the chassis or exhaust pipe	CHECK the exhaust system. REPAIR as necessary. REFER to EXHAUST SYSTEM article.
Squeak - occurs with initial brake pedal application	Disc brake pads	Under certain conditions, asbestos-free pads can generate a squeak noise. This noise is normal and does not indicate a concern.
Squeak - a constant noise that occurs with brake pedal applications	Damaged or worn disc brake pads	INSPECT the pads for oil, grease or brake fluid contamination. CHECK for glazed linings. A brake disc with hard spots will also cause a squeak type noise. REPAIR or INSTALL new pads as necessary. REFER to FRONT DISC BRAKE article for the front brakes or REAR DISC BRAKE article for the rear brakes.
Squeak - noise occurs over bumps or when turning	Worn control arm bushings	INSPECT the control arm bushings. SPRAY with lubricant and CARRY OUT a bounce test to determine which bushing is causing the concern. REPAIR as necessary. REFER to FRONT SUSPENSION article for front bushings or REAR SUSPENSION article for rear bushings.
	Worn or damaged shock absorber/strut	INSPECT the shock absorber/strut for damage. CARRY OUT a bounce test to isolate the noise. INSTALL a new shock absorber/strut as necessary. REFER to FRONT SUSPENSION article for the front shock absorber/strut or REAR SUSPENSION article for the rear shock absorber/strut.
Rattle - heard when closing/opening the door or window	Loose internal door mechanism, bracket or attachment	REPEAT the motion or CARRY OUT a tap test to duplicate the noise. INSPECT the door for loose components. TIGHTEN loose components or USE the Rotunda Squeak and Rattle Kit to isolate any rattling components.
Squeak or rattle - heard inside the vehicle over rough roads/bumps	Misaligned glove compartment door/hinge	ALIGN the glove compartment door.
	Instrument panel trim loose or misaligned	INSPECT the instrument panel trim for missing or loose clips or screws. REPAIR as necessary.
	Loose interior component or trim	CARRY OUT a touch test. ELIMINATE the noise by pressing or pulling on interior trim and components. USE the Rotunda Squeak and Rattle Kit to isolate any rattling/squeaking components.
Squeak or rattle - noise with a vibration concern	Damaged or worn sub-frame mounts	INSPECT the upper and lower absorbers for damage or wear. CHECK the sub-frame for damage. VERIFY the nuts and bolts are tightened to specifications. TIGHTEN as necessary. REFER to UNI-BODY, SUBFRAME AND MOUNTING SYSTEM article.

Symptom Chart - Steering Noise/Vibration

Condition	Possible Sources	Action
Steering grunt or shudder - occurs when turning into or out of a turn at low speeds (temperature sensitive)	Steering gear or power steering hoses	Go to Steering Gear Grunt/Shudder Test.
Steering system clonk - hydraulic knocking sound	Air in the steering hydraulic system	CHECK for leaks in the system. PURGE the air from the system. REFER to STEERING SYSTEM - GENERAL INFORMATION article.
Power steering pump moan - loud humming noise occurs when the steering wheel is rotated to the stop position. Produces a 120-600 Hz frequency that changes with rpm	Power steering hose grounded out to chassis	INSPECT the power steering hoses. REPAIR as necessary.
	Aerated fluid	CHECK for leaks in the system. PURGE the air from the system. REFER to STEERING SYSTEM - GENERAL INFORMATION article.
	Steering gear isolators	INSPECT the isolators for wear or damage. REPAIR as necessary. REFER to POWER STEERING article.
	Low fluid	CHECK the fluid level. REFILL as necessary.
	Power steering pump brackets loose or misaligned	CHECK the bolts, brackets and bracket alignment. TIGHTEN the bolts to specification. REPAIR or INSTALL new brackets as necessary. REFER to POWER STEERING article.
Steering gear clunk - occurs only while cornering over a bump (can be temperature sensitive)	Steering gear	INSPECT the steering gear for loose mounting bolts. TIGHTEN as necessary. REFER to POWER STEERING article.
Feedback (rattle, chuckle, or knocking noise in the steering gear) - a condition where roughness is felt in the steering wheel when the vehicle is driven over rough surfaces	Column intermediate/flexible shaft joints damaged or worn	INSTALL a new steering column. REFER to STEERING COLUMN article.
	Loose, damaged or worn tie-rod ends	TIGHTEN the nuts to specification or INSTALL new tie-rod ends as necessary. REFER to STEERING LINKAGE article.
	Steering gear insulators or mounting bolts loose or damaged	TIGHTEN the bolts or INSTALL new bolts as necessary. REFER to POWER STEERING article.
	Steering column intermediate shaft bolts are loose	TIGHTEN the bolts to specification. REFER to STEERING COLUMN article.
	Steering column damaged or worn	REPAIR or INSTALL a new steering column as necessary. REFER to STEERING COLUMN article.
	Loose suspension bushings, bolts, or ball joints	INSPECT the suspension system. TIGHTEN or INSTALL new components as necessary. REFER to FRONT SUSPENSION article for the front suspension or REAR SUSPENSION article for the rear suspension.
Feedback (nibble at the steering wheel) - a condition where slight rotational movement is felt in the steering wheel when the vehicle is driven over rough or grooved surfaces	Lateral runout in the tire or wheel	Go to Pinpoint Test F .
	Yoke spring in the steering gear	CHECK TSBs for revised yoke spring for applicable vehicle.
Accessory drive belt squeal/chirp - when rotating the steering wheel from stop to stop	Loose or worn accessory drive belt	ADJUST or INSTALL a new accessory drive belt as necessary. REFER to ACCESSORY DRIVE - 2.3L article for the 2.3L engine or ACCESSORY DRIVE - 3.0L (4V) article for the 3.0L engine.
Power steering gear hiss	Steering column intermediate/flexible shaft-to-steering gear is binding or misaligned	REPAIR or INSTALL a new steering column as necessary. REFER to STEERING COLUMN article.
	Grounded or loose steering column boot at the dash panel	REPAIR as necessary.
	Damaged or worn steering gear input shaft and valve	REPAIR or INSTALL a new steering gear as necessary. REFER to POWER STEERING article.
Steering column rattle	Loose bolts or attaching brackets	TIGHTEN the bolts to specifications. REFER to STEERING COLUMN article.
	Loose, worn or insufficiently lubricated column bearings	LUBRICATE the steering column bearings or INSTALL new steering column as necessary. REFER to STEERING COLUMN article.
	Steering shaft insulators damaged or worn	INSTALL new insulators. REFER to STEERING COLUMN article.
	Intermediate/flexible shaft compressed or extended	INSPECT the rubber spider coupling for damage. INSTALL a new steering column. REFER to STEERING COLUMN article.
Steering column squeak or cracks	Insufficiently lubricated steering shaft bushings	LUBRICATE the steering shaft and shaft tube seals.
	Loose or misaligned steering column shrouds	TIGHTEN or ALIGN the steering column shrouds.
	Steering wheel rubbing against the steering column shrouds	REPOSITION the steering column shrouds.
	Upper or lower bearing sleeve out of position	REPOSITION the bearing sleeves.
Power steering pump noisy	Incorrect assembly of components. Imperfections on the outside diameter or end surface of the power steering pump rotor Damaged or worn power steering pump rotor splines A crack on the inner surface of the power steering pump cam Interference between the power steering pump rotor and cam Damaged or worn power steering pump rotor and pressure plates	REPAIR or INSTALL a new power steering pump as necessary. REFER to POWER STEERING article.
Power steering pump swish noise	Power steering fluid flow into the bypass valve of the pump valve housing with the fluid temperature below 54°C (130°F)	Acceptable condition.
Power steering pump whine noise	Aerated fluid	CHECK for a leak in the system. PURGE the air from the system. REFER to STEERING SYSTEM - GENERAL INFORMATION article.
	Damaged power steering pump cam	REPAIR or INSTALL a new power steering pump as necessary. REFER to POWER STEERING article.
	Damaged valve cover O-ring seal	REPAIR or INSTALL a new power steering pump as necessary. REFER to POWER STEERING article.
Power steering pump clicking (mechanical) noise	Power steering pump rotor slippers too long, excessive rotor slipper-to-slot clearance or damaged or worn rotor assembly	REPAIR or INSTALL a new power steering pump as necessary. REFER to POWER STEERING article.
Power steering pump clatter noise	Damaged corners on the outside diameter of the power steering pump rotor or distorted rotor slipper ring	REPAIR or INSTALL a new power steering pump as necessary. REFER to POWER STEERING article.

Symptom Chart - Suspension Noise/Vibration

Condition	Possible Sources	Action
Squeak or grunt - noise from the front suspension, occurs more in cold ambient temperatures. More noticeable over rough roads or when turning	Front stabilizer bar insulators	Under these conditions, the noise is acceptable. CHECK TSBs.
Clunk - noise from the front suspension, occurs in and out of turns	Loose front struts	INSPECT for loose nuts or bolts. TIGHTEN to specifications. REFER to FRONT SUSPENSION article.
Clunk - noise from the rear suspension, occurs when shifting from reverse to drive	Loose rear suspension components	INSPECT for loose or damaged rear suspension components. REPAIR or INSTALL new components as necessary. REFER to REAR SUSPENSION article.
Click or pop - noise from the front suspension. More noticeable over rough roads or over bumps	Worn or damaged ball joints	CARRY OUT a ball joint inspection. INSTALL new ball joints or control arms as necessary. REFER to FRONT SUSPENSION article.
Click or pop (front wheel drive [FWD] vehicles) - noise occurs when vehicle is turning	Worn or damaged ball joints	CARRY OUT a ball joint inspection. INSTALL new ball joints or control arms as necessary. REFER to FRONT SUSPENSION article.
Click or snap - occurs when accelerating around a corner	Damaged or worn outer constant velocity (CV) joint	INSPECT the outer CV joint and boot. REPAIR or INSTALL a new CV joint as necessary. REFER to FRONT DRIVE HALFSHAFTS article.
Front suspension noise - a squeak, creak, or rattle noise. Occurs mostly over bumps or rough roads	Steering components Loose or bent front struts or shock absorbers Damaged spring or spring mounts Damaged or worn control/radius arm bushings Worn or damaged stabilizer bar bushings or links	Go to Pinpoint Test F .
Rear suspension noise - a squeak, creak, or rattle noise. Occurs mostly over bumps or rough roads	Loose or bent rear shock absorbers Damaged spring or spring mounts Damaged or worn control arm bushings	Go to Pinpoint Test G .
Shudder - occurs during acceleration from a slow speed or stop	Rear drive axle assembly mispositioned	CHECK the axle mounts and the rear suspension for damage or wear. REPAIR as necessary.
	Incorrect or high constant velocity (CV) joint operating angle	REPAIR as necessary.
	Damaged or worn front suspension components	CHECK for a loose stabilizer bar, damaged or loose strut/strut bushings or loose or worn ball joints. INSPECT the steering linkage for wear or damage. REPAIR or INSTALL new components as necessary. REFER to FRONT SUSPENSION article.
Shimmy - most noticeable on coast/deceleration. Also hard steering condition	Excessive positive caster	CHECK the caster alignment angle. CORRECT as necessary. REFER to SUSPENSION SYSTEM - GENERAL INFORMATION article.

Symptom Chart - Tire Noise/Vibration

Condition	Possible Sources	Action
Tire noise - hum/moan at constant speeds	Abnormal wear patterns	SPIN the tire and CHECK for tire wear. INSTALL a new tire as necessary. INSPECT for damaged/worn suspension components. CARRY OUT wheel alignment. REFER to SUSPENSION SYSTEM - GENERAL INFORMATION article.
Tire noise - noise tone lowers as the vehicle speed is lowered	Out-of-balance tire	BALANCE the tire and road test. INSTALL a new tire as necessary. REFER to WHEELS AND TIRES article.
Tire noise - ticking noise, changes with speed	Nail puncture or a stone in the tire tread	INSPECT the tire. REPAIR as necessary. REFER to WHEELS AND TIRES article.
Wheel and tire - vibration and noise concern is directly related to vehicle speed and is not affected by acceleration, coasting or decelerating	Damaged or worn tire	Go to Pinpoint Test H .
Tire wobble or shudder - occurs at lower speeds	Damaged wheel bearings	SPIN the tire and CHECK for abnormal wheel bearing play or roughness. ADJUST or INSTALL new wheel bearings as necessary. REFER to FRONT SUSPENSION article for the front bearings or REAR SUSPENSION article for the rear bearings.
	Damaged wheel	INSPECT the wheel for damage. INSTALL a new wheel as necessary. REFER to WHEELS AND TIRES article.
	Damaged or worn suspension components	INSPECT the suspension components for wear or damage. REPAIR as necessary. REFER to FRONT SUSPENSION article for the front suspension or REAR SUSPENSION article for the rear suspension.
	Loose wheel nuts	CHECK the wheel nuts. TIGHTEN to specification. REFER to WHEELS AND TIRES article.
	Damaged or uneven tire wear	SPIN the tire and CHECK for abnormal tire wear or damage. INSTALL a new tire as necessary. REFER to WHEELS AND TIRES article.
Tire shimmy or shake - occurs at lower speeds	Wheel/tire out of balance	BALANCE the wheel/tire assembly. INSTALL a new tire as necessary. REFER to WHEELS AND TIRES article.
	Uneven tire wear	CHECK for abnormal tire wear. INSTALL a new tire as necessary. REFER to WHEELS AND TIRES article.
	Excessive radial runout of the wheel or tire	CARRY OUT a radial runout test of the wheel and tire. INSTALL a new tire as necessary. REFER to WHEELS AND TIRES article.
	Worn or damaged wheel studs or elongated stud holes	INSPECT the wheel studs and wheels. INSTALL new components as necessary. REFER to WHEELS AND TIRES article.
	Excessive lateral runout of the wheel or tire	CARRY OUT a lateral runout test of the wheel and tire. CHECK the wheel, tire and hub. REPAIR or INSTALL new components as necessary.
	Foreign material between the brake disc and hub or in the brake disc fins.	CLEAN the mounting surfaces of the brake disc and hub. CHECK the brake disc fins for material.
High speed shake or shimmy	Excessive wheel hub runout Damaged or worn tires Damaged or worn wheel bearings Worn or damaged suspension or steering linkage components Brake disc or drum imbalance	Go to Pinpoint Test I .

Symptom Chart - Manual Transmission and Transfer Case Noise/Vibration

Condition	Possible Sources	Action
Clutch rattling noise - occurs with the clutch engaged, noise changes/disappears with the clutch pedal applied	Flywheel bolts, clutch housing bolts or clutch pressure plate bolts loose	TIGHTEN the bolts to specifications. CHECK the bolts for damage. REFER to CLUTCH article.
Clutch squeaking noise - occurs with clutch pedal applied/released	Worn clutch pedal shaft or bushings	INSPECT the clutch pedal for wear or damage. REPAIR as necessary. REFER to CLUTCH CONTROLS article.
Clutch whirring/rattle noise - occurs when the clutch pedal is applied	Worn, damaged or misaligned clutch release bearing/slave cylinder	INSTALL a new clutch release bearing/slave cylinder. REFER to CLUTCH CONTROLS article.
Clutch grating/grinding noise - occurs when the clutch pedal is applied	Clutch pressure plate fingers bent or worn	INSPECT the clutch pressure plate release fingers. INSTALL a new pressure plate as necessary. REFER to CLUTCH article.
	Contact surface of the clutch release bearing/slave cylinder worn or damaged	INSTALL a new clutch release bearing/slave cylinder. REFER to CLUTCH CONTROLS article.
Clutch chatter - a small amount of noise when the clutch pedal is released at initial take-off	Clutch engagement	Acceptable operating condition.
Clutch chatter/grabs - in some cases a shudder is felt. Occurs with the clutch pedal applied/released	Damaged or worn powertrain/driveline mounts	INSPECT the powertrain/drivetrain mounts. REFER to ENGINE - 2.3L article for the 2.3L engine. INSTALL new mounts as necessary.
	Binding or dragging plunger of the clutch master cylinder or slave cylinder	CHECK the master and slave cylinder operation. INSPECT the components for damage or wear. INSTALL a new master or slave cylinder as necessary. REFER to CLUTCH CONTROLS article.
	Grease or oil on the clutch disc facing	CHECK the input shaft seal and rear main oil seal. REPAIR as necessary. INSTALL a new clutch disc. REFER to CLUTCH article.
	Clutch disc surface glazed or damaged	INSPECT the clutch disc surface for a glazed, hardened or damaged condition. CARRY OUT a disc check. INSTALL a new clutch disc as necessary. REFER to CLUTCH article.
	Damaged or worn clutch pressure plate	INSPECT the clutch pressure plate for wear or damage. INSTALL a new clutch pressure plate as necessary. REFER to CLUTCH article.
	Flywheel surface damaged or glazed	INSPECT the flywheel for damage or wear. CARRY OUT a flywheel runout check. INSTALL a new flywheel as necessary. REFER to ENGINE - 2.3L article for the 2.3L engine.
Clutch chatter noise - noise when the clutch pedal is released at initial take-off. Clutch is hard to engage and disengage	Clutch pressure plate worn, damaged or not correctly aligned	INSPECT the clutch pressure plate release fingers for uneven wear or burnt clutch components. INSTALL a new pressure plate as necessary. REFER to CLUTCH article.
Clutch vibration	Loose flywheel bolts Damaged or loose clutch pressure plate Excessive flywheel runout	Go to Pinpoint Test J .
Transmission rattling/clattering noise - noise at idle or on light acceleration from a stop. Gear selection is difficult	Gearshift lever joint worn or damaged	INSTALL a new gearshift lever. REFER to MANUAL TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS article.
	Gearshift lever loose	TIGHTEN the bolts to specification. REFER to MANUAL TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS article.
	Gearshift linkage rods worn or damaged	CHECK the linkage bushings for wear. INSTALL new linkage rods as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS article.
Transmission rattling/clattering noise - occurs in neutral or in gear, at idle	Incorrect fluid level or fluid quality	VERIFY that the transmission is filled to the correct level and with the specified fluid.
Transmission rattling/clattering noise - noise at idle in neutral	Worn or rough reverse idler gear	CHECK the reverse idler gear. REPAIR as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
	Rough running engine, cylinder misfire	CHECK the ignition system. CARRY OUT a cylinder power test. REPAIR as necessary. REFER to ENGINE IGNITION - 2.3L article for the 2.3L engine or ENGINE IGNITION - 3.0L (4V) article for the 3.0L engine.
	Excessive backlash in gears	CHECK the gear backlash. ADJUST as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
	Worn countershaft gears	REPAIR as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
Transmission whine - a mild whine at extreme speeds or high rpm	Rotating gears/geartrain	Acceptable noise.
Transmission whine - a high pitched whine, also described as a squeal	Transmission gears are worn (high mileage vehicle)	Result of normal gear wear. REPAIR as necessary.
	Mismatched gear sets	INSPECT the gear sets for an uneven wear pattern on the face of the gear teeth. REPAIR as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
	Damaged or worn transmission bearing(s)	INSPECT the transmission bearings. INSTALL new bearings as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
Transmission growling/humming - noise occurs in the forward gears. The noise is more prominent when the gear is loaded. The problem gear can be located as the noise occurs in a specific gear position	Gear is cracked, chipped or rough	INSPECT the transmission gears for damage or wear. INSTALL new gears as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
Transmission hissing - noise in neutral or in forward gears. As bearings wear or break up, the noise changes to a thumping noise	Damaged or worn bearings	INSPECT the transmission bearings. INSTALL new bearings as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
Transmission knocking/thudding - noise at low speeds in forward gears	Bearings with damaged balls or rollers or with pitted and spalled races	INSPECT the transmission bearings. INSTALL new bearings as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
Transmission rumble/growl - noise at higher speeds in forward gears, more pronounced in a coast/deceleration condition	Incorrect driveline angle	CHECK the driveline angle. REPAIR as necessary. REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
	Driveshaft out of balance or damaged	CHECK the driveshaft for damage, missing balance weights or undercoating. Using the vibration analyzer (VA), CHECK the driveshaft balance. CARRY OUT a driveline vibration test. For additional information, REFER to DRIVESHAFT article. REPAIR as necessary.
Transmission rumble/growl - noise at all speeds in forward gears, more pronounced in a heavy acceleration condition	Damaged or worn transmission bearing or gears (high mileage vehicles)	CHECK the transmission fluid for excessive metal particles. REPAIR as necessary. REFER to MANUAL TRANSAXLE/TRANSMISSION article.
Transfer case whine - noise at all ranges	Incorrect fluid level or fluid quality	VERIFY that the transfer case is filled to the correct level and with the specified fluid. REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
	Worn oil pump	DISASSEMBLE the transfer case. CHECK the oil pump for wear or damage. REPAIR as necessary. REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
	Under-inflated or oversized tires	CONFIRM that the tires and wheels are correct for the vehicle. CHECK that the tire inflation pressures are correct.
Transfer case growl/rumble - noise at all ranges	Damaged or worn bearings or gears	DISASSEMBLE the transfer case. CHECK the bearings or gears for wear or damage. REPAIR as necessary. REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
Transfer case scraping/grating - noise at all ranges	Excessively stretched drive chain hitting the case	DISASSEMBLE the transfer case. CHECK the drive chain for wear or damage. REPAIR as necessary. REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
Transfer case howl/hum - noise at all ranges or high range only	Worn or damaged sun (input) gear, clutch pack (intermediate) gear or output shaft gear	CHECK the gears for wear or damage. REPAIR as necessary. REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
Transfer case howl/hum - noise at low range only	Worn or damaged intermediate gear and sliding gears (clutch pack)	CHECK the gears for wear or damage. REPAIR as necessary. REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) article.
Transfer case vibration - vibration felt with vehicle in 4WD	Transfer case mounting Driveshaft out of balance Excessive pinion flange runout	Go to Pinpoint Test K .

Symptom Chart - Automatic Transmission Noise/Vibration

Condition	Possible Sources	Action
Rattle - occurs at idle or at light acceleration from a stop	Damaged engine or transmission mounts	CHECK the powertrain/drivetrain mounts for damage. INSTALL new mounts as necessary. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article for the automatic transmission.
	A loose front exhaust pipe heat shield	REPAIR or INSTALL a new heat shield as necessary.
	Loose inspection plate or dust cover plate	CHECK for loose bolts. TIGHTEN to specifications. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
	Loose flexplate-to-converter nuts	CHECK for loose nuts. TIGHTEN to specifications. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
Whine - pitch increases with vehicle speed. Starts in first and second gear, decreases or goes away at higher gears	Damaged or worn low one-way clutch Damaged or worn intermediate one-way clutch Friction elements Damaged or worn planetary or sun gear	INSPECT the transmission for wear or damage. REPAIR or INSTALL new components as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
Whine - the pitch changes with engine speed	A worn or damaged accessory drive component	CARRY OUT the Engine Accessory Test. REPAIR or INSTALL new components as necessary.
	Incorrect fluid level	VERIFY the transmission is filled to the correct level. ADD fluid as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
	Partially blocked filter	INSPECT the filter. CLEAN or INSTALL a new filter as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
	Worn or damaged torque converter	CARRY OUT the torque converter service and replacement check. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
	Worn or damaged front pump	INSPECT the front pump. INSTALL a new front pump as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
Whine - pitch changes with vehicle speed	Speedometer cable or gears	REPAIR or INSTALL new cables or gears as necessary.
Whine/moan type noise - pitch increases or changes with vehicle speed	Damaged engine or transmission mount	CHECK the powertrain/drivetrain mounts for damage. REFER to ENGINE - 2.3L article for the 2.3L engine, ENGINE - 3.0L (4V) article for the 3.0L engine, or AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article for the automatic transmission.
	U-joints or constant velocity (CV) worn or damaged	INSPECT the U-joints or CV joints for wear or damage. INSTALL new U-joints or a driveshaft as necessary. REFER to DRIVESHAFT article.
	Damaged or worn differential ring and pinion	REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
	Planetary gears nicked or chipped	CHECK the planetary gears for damage. INSTALL new components as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
Whistle - noise is high pitched, constant. Changes in pitch with throttle position	Hydraulic pressure in the main control	INSPECT the main control. REPAIR or INSTALL new components as necessary. REFER toAUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
	Incorrect band/clutch apply pressure	CARRY OUT the line pressure tests. REPAIR or INSTALL components as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
	Worn or damaged torque converter	CARRY OUT the torque converter service and replacement check. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
Clunk - occurs when shifting from park to a drive or reverse position	Damaged powertrain mounts	INSPECT the powertrain mounts for damage. INSTALL new mounts as necessary.
	Damaged or worn pinion bearings	REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
	Worn driveshaft constant velocity (CV) joint	INSPECT the CV joint. INSTALL a new driveshaft as necessary. REFER to DRIVESHAFT article.
	Worn friction elements or excessive clutch pack end plate play	INSPECT the transmission for wear. CHECK that all end play and clearances are within specification. REPAIR or INSTALL new components as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
Bump - occurs when shifting from park to a drive or reverse position. Similar to clunk but with no sound	Initial gear engagement	Acceptable condition.
Buzz or hiss	Incorrect driveline angles	CHECK for correct driveline angles. REPAIR as necessary. REFER to Driveline Angles.
	Worn or damaged main control solenoids or valves	Using a transmission tester, ACTIVATE the solenoids to duplicate the sound. INSTALL new components as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
Vibration - a high frequency (20-80 Hz) vibration that is felt through the seat or gear shifter. Changes with engine speed	Transmission cooler lines grounded out	CHECK the transmission cooler lines. REPAIR as necessary.
	Flexplate-to-torque converter nuts loose	CHECK the flexplate nuts. TIGHTEN to specification. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
	Fluid filler tube grounded out	CHECK the fluid filler tube. REPAIR as necessary.
	Shift cable incorrectly routed, grounded out or loose	CHECK the shift cable. REPAIR as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article.
Shutter or chatter - occurs with light to medium acceleration from low speeds or a stop	Electrical inputs/outputs Vehicle wiring harness Incorrect inputs/outputs from the powertrain control module (PCM), digital transmission range (TR) sensor, brake pedal position (BPP) sensor, throttle position (TP) sensor, transmission speed sensor (TSS), output speed shaft (OSS) sensor or the torque converter clutch (TCC).	CARRY OUT a Torque Converter Clutch Operation Test. RUN the on-board diagnostics or self-test. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E article. CLEAR the DTCs, road test and rerun the on-board diagnostics or self-test.

Symptom Chart - Electronically Controlled Continuously Variable Transmission (eCVT) Noise/Vibration

Condition	Possible Sources	Action
Rattle-occurs at idle or at light acceleration from a stop	Damaged engine or electronically controlled electronically controlled continuously variable transmission (eCVT) mounts	CHECK the powertrain/drivetrain mounts for damage. INSTALL new mounts as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
	A loose front exhaust pipe heat shield	REPAIR or INSTALL a new heat shield as necessary.
	Loose inspection plate or dust cover plate	CHECK for loose bolts. TIGHTEN to specifications. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
	Loose flexplate-to-converter nuts	CHECK for loose nuts. TIGHTEN to specifications. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
Whine-pitch increases with vehicle speed. Starts in first and second gear, decreases or goes away at higher gears	Damaged or worn low one-way clutch Damaged or worn intermediate one-way clutch Friction elements Damaged or worn planetary or sun gear	INSPECT the electronically controlled electronically controlled continuously variable transmission (eCVT) for wear or damage. REPAIR or INSTALL new components as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
Whine-the pitch changes with engine speed	A worn or damaged accessory drive component	CARRY OUT the Engine Accessory Test. REPAIR or INSTALL new components as necessary.
	Incorrect fluid level	CHECK that the electronically controlled continuously variable transmission (eCVT) is filled to the correct level. ADD fluid as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
	Partially blocked filter	INSPECT the filter. CLEAN or INSTALL a new filter as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
	Worn or damaged front pump	INSPECT the front pump. INSTALL a new front pump as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
Whine-pitch changes with vehicle speed	Speedometer cable or gears	REPAIR or INSTALL new cables or gears as necessary.
Whine/moan type noise-pitch increases or changes with vehicle speed	Damaged engine or electronically controlled eCVT mount	CHECK the powertrain/drivetrain mounts for damage. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
	U-joints worn or damaged	INSPECT the U-joints or CV joints for wear or damage. INSTALL new U-joints or CV joints as necessary. REFER to DRIVESHAFT article.
	Damaged or worn differential ring and pinion	INSTALL a new rear axle. REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
	Planetary gears nicked or chipped	INSTALL a new electronically controlled continuously variable transmission (eCVT). REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
Whistle-noise is high pitched, constant. Changes in pitch with the throttle position	Hydraulic pressure in the main control	INSPECT the main control. REPAIR or INSTALL new components as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
	Incorrect band/clutch apply pressure	CARRY OUT the line pressure tests. REPAIR or INSTALL components as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
Clunk-occurs when shifting from park to a drive or reverse position	Damaged powertrain mounts	INSPECT the powertrain mounts for damage. INSTALL new mounts as necessary.
	Damaged or worn pinion bearings	CHECK for abnormal bearing play or roughness. INSTALL new bearings as necessary. REFER to REAR DRIVE AXLE/DIFFERENTIAL article.
	Worn driveshaft constant velocity (CV) joint	INSPECT the CV joint. INSTALL a new driveshaft as necessary. REFER to DRIVESHAFT article.
	Worn friction elements or excessive clutch pack end plate play	INSTALL a new electronically controlled continuously variable transmission (eCVT). REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.
Bump-occurs when shifting from park to a drive or reverse position. Similar to Clunk but with no sound	Initial gear engagement	Acceptable condition.
Buzz or hiss	Incorrect driveline angles	CHECK for correct driveline angles. REPAIR as necessary. REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
Vibration-a high frequency (20-80 Hz) that is felt through the seat or gear shifter. Changes with engine speed	Electronically controlled continuously variable transmission (eCVT) cooler lines grounded out	CHECK the eCVT cooler lines. REPAIR as necessary.
	Fluid filler tube grounded out	CHECK the fluid filler tube. REPAIR as necessary.
	Shift cable incorrectly routed, grounded out or loose	CHECK the shift cable. REPAIR as necessary. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) article.