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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 962 (Noise, Vibration & Harshness -- F150 Pickup) >> Diagnosis And Testing >> Noise, Vibration and Harshness (NVH) >> Symptom Charts >> Symptom Chart - Driveline Noise/Vibration

Symptom Chart - Driveline Noise/Vibration

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
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.
  • 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.
  • Damaged or worn differential side or pinion bearings.
  • Damaged or worn differential side gears and pinion gears.
  • Front axle groan, hum or vibration - occurs when operated in 2 HIGH
  • Front drive axle halfshaft rotational speed variance
  • 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 or transmission.
  • Damaged or worn pinion bearings.
  • Damaged or worn universal joints (U-joints).
  • INSPECT the U-joints for wear or damage. INSTALL new U-joints as necessary. REFER to DRIVESHAFT .
  • Loose suspension components.
  • INSPECT the suspension for damage or wear. REPAIR or INSTALL new components as necessary.
  • Broken powertrain mounts.
  • Idle speed too high.
  • CHECK for the correct idle speed.
  • Driveline clunk - occurs as the vehicle starts to move forward following a stop
  • Worn or galled driveshaft slip-yoke splines.
  • CLEAN and INSPECT the splines of the yoke for a worn or galled condition. INSTALL a new yoke as necessary. REFER to DRIVESHAFT .
  • Worn or galled driveshaft and coupling shaft splines.
  • CLEAN and INSPECT the splines of the driveshaft and coupling shaft for a worn or galled condition. INSTALL a new driveshaft assembly as necessary. REFER to DRIVESHAFT .
  • Loose rear leaf spring U-bolts.
  • Driveline clunk (4WD vehicles) - occurs during shift-on-the-fly engagement
  • Clutch relay.
  • Shift motor.
  • Transfer case.
  • 4x4 module.
  • Clicking, popping or grinding - occurs while vehicle is turning
  • Brake components.
  • Steering components.
  • INSPECT the drag link, inner and outer tie-rods or idler arm for wear or damage. REPAIR as necessary.
  • Suspension components.
  • 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.
  • 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).
  • 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 & TIRES .
  • Incorrect 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. CHECK the driveshaft balance. CARRY OUT a driveline vibration test. REFER to DRIVELINE SYSTEM-GENERAL INFORMATION .
  • 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 .
  • Excessive pinion flange runout.
  • Grunting - normally associated with a shudder experienced during acceleration from a dead stop
  • Driveshaft slip yoke binding.
  • CLEAN and LUBRICATE the male and female splines.
  • Loose rear spring U-bolts.
  • 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.
  • Chuckle - heard at coast/deceleration. Also described as a knock
  • Incorrect ring and pinion contact or by damaged teeth on the coast side of the ring and pinion.
  • Knock - noise occurs at various speeds. Not affected by acceleration or deceleration
  • Gear tooth damage to the drive side of the ring and pinion.
  • Excessive axle shaft end play. (Vehicles with integral axles.)
  • Scraping noise - a continuous low pitched noise starting at low speeds
  • Worn or damaged pinion bearings.
  • 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 spring U-bolts.
  • Incorrect or high CV joint operating angle.
  • CHECK vehicle ride height is within limits. 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.
  • Driveline angles out of specification.
  • 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 .
  • Binding, damaged or galled splines on the driveshaft slip-yoke.
  • CLEAN and INSPECT the splines of the slip-yoke, driveshaft and coupling shaft for a worn, damaged or galled condition. INSTALL a new slip-yoke or driveshaft assembly as necessary. REPAIR as necessary. REFER to DRIVESHAFT .
  • Driveline vibration - occurs at cruising speeds
  • U-joints are worn.
  • CHECK for wear or incorrect seating. INSTALL new U-joints as necessary. REFER to DRIVESHAFT .
  • 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. DRIVESHAFT .
  • Loose axle pinion flange bolts.
  • INSPECT the axle pinion flange. TIGHTEN the pinion flange bolts to specification. REFER to DRIVESHAFT .
  • Excessive axle pinion flange runout.
  • Driveshaft is out-of-balance.
  • CHECK the driveshaft for damage, missing balance weights or undercoating. CHECK driveshaft balance. CARRY OUT a driveline vibration test. REFER to DRIVELINE SYSTEM-GENERAL INFORMATION . REPAIR as necessary.
  • Binding or damaged splines on the driveshaft slip-yoke.
  • CLEAN and INSPECT the splines of the slip-yoke, driveshaft and coupling shaft for wear or damage. INSTALL a new slip-yoke or driveshaft assembly as necessary. REFER to DRIVESHAFT . REPAIR as necessary.
  • Driveshaft runout.
  • Incorrect lateral and radial tire/wheel runout.
  • INSPECT the tire and wheels. MEASURE tire runouts. REPAIR or INSTALL new components as necessary. REFER to WHEELS & TIRES .
  • Driveline angles out of specification.
  • Incorrect starter motor mounting.
  • INSPECT the starter motor for correct mounting. REPAIR as necessary. REFER to STARTING SYSTEM .
  • Starter motor.
  • CHECK the starter motor. REPAIR or INSTALL a new starter motor as necessary. REFER to STARTING SYSTEM .
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