Symptom Chart - Engine Performance

WARNING: This page is about a different car, the 2011 Ford Pickup, 2011 Ford F550 Super Duty, 2011 Ford F450 Super Duty, and 2011 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART - ENGINE PERFORMANCE

Condition	Possible Sources	Action
Difficult starting	Inoperative or damaged glow plug system Inoperative or damaged fuel system Inoperative or damaged starting system Damaged charging system/battery Burnt valve Worn piston Worn piston ring(s) Worn cylinder Damaged head gasket	INSPECT each system for damage. Refer to the appropriate Engine articles for the procedure. REFER to the INTRODUCTION article. REPAIR as necessary. TEST the system for normal operation. REFER to CHARGING SYSTEM article. INSPECT the valve(s) and valve seat(s) for damage. REFER to VALVE INSPECTION and Valve Seat Inspection in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the piston(s) for wear. REFER to PISTON INSPECTION in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the piston ring(s) for wear. REFER to PISTON RING END GAP and PISTON INSPECTION in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the cylinder bore for wear. REFER to CYLINDER BORE OUT-OF-ROUND in this service information. REPAIR as necessary. TEST the system for normal operation. REMOVE the cylinder head(s). REFER to CYLINDER HEAD in this service information. INSPECT the head gasket(s). REPAIR as necessary. TEST the system for normal operation.
Poor idling	Inoperative or damaged cooling system Inoperative or damaged fuel system Damaged hydraulic lash adjuster Incorrect valve-to-seat contact Damaged head gasket(s)	INSPECT the cooling system for damage. REFER to ENGINE COOLING - DIESEL ENGINE article. REPAIR as necessary. TEST the system for normal operation. INSPECT the fuel system for damage. REFER to the INTRODUCTION article. REFER to FUEL CHARGING AND CONTROLS - 6.7L DIESEL article. REPAIR as necessary. TEST the system for normal operation. INSPECT the hydraulic lash adjuster(s) for damage. REFER to HYDRAULIC LASH ADJUSTER INSPECTION in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the valve(s) and valve seat(s) for damage. REFER to VALVE INSPECTION and Valve Seat Inspection in this service information. REPAIR as necessary. TEST the system for normal operation. REMOVE the cylinder head(s). REFER to CYLINDER HEAD in this service information. INSPECT the head gasket(s). REPAIR as necessary. TEST the system for normal operation.
Abnormal combustion	Inoperative or damaged fuel system Leaking or damaged Charge Air Cooler (CAC), upper intake or gaskets EGR system fault Inoperative or damaged cooling system Malfunctioning or damaged air intake system Damaged hydraulic lash adjuster(s) Burnt or sticking valve Worn valve guides, valves and seals Weak or broken valve spring(s) Turbocharger shaft seals	INSPECT each system for damage. Refer to the appropriate Engine articles for the procedure. REFER to the INTRODUCTION article. REPAIR as necessary. TEST the system for normal operation. INSPECT the air intake system for damage. REFER to INTAKE AIR DISTRIBUTION SYSTEM & INTAKE AIR FILTERING SYSTEM article. Repair as necessary. TEST the system for normal operation. INSPECT the hydraulic lash adjuster(s) for damage. REFER to HYDRAULIC LASH ADJUSTER Inspection in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the valve(s) and valve seat(s) for damage. REFER to VALVE INSPECTION and Valve Seat Inspection in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the valve(s) and valve guide(s) for wear. REFER to VALVE INSPECTION and Valve Guide Inner Diameter in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the valve spring(s) for damage. REFER to VALVE SPRING FREE LENGTH in this service information. REPAIR as necessary. TEST the system for normal operation. REMOVE and INSPECT the Turbocharger. REFER to FUEL CHARGING AND CONTROLS - TURBOCHARGER article. REPAIR as necessary. TEST the system for normal operation.
Excessive oil consumption	Leaking oil Oil dilution (fuel) Malfunctioning crankcase vent oil separator Worn valve stem seal Worn valve stem or valve guide Sticking piston rings Worn piston ring groove Worn piston or cylinder Turbocharger shaft seals	REPAIR oil leakage. INSPECT the fuel injectors. REFER to FUEL CHARGING AND CONTROLS - 6.7L DIESEL article. REPAIR as necessary. TEST the system for normal operation. INSPECT the crankcase vent oil separator for damage. REFER to EMISSION CONTROL SYSTEM article. REPAIR as necessary. TEST the system for normal operation. INSPECT the valve(s) and valve stem seal(s) for wear. REFER to VALVE INSPECTION in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the valve(s) and valve guide(s) for wear. REFER to VALVE INSPECTION and Valve Guide Inner Diameter in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the piston(s) and cylinder block for wear. REFER to PISTON INSPECTION and CYLINDER BORE OUT-OF-ROUND in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the piston(s) for wear. REFER to PISTON INSPECTION in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the piston(s) and cylinder block for wear. REFER to PISTON INSPECTION and CYLINDER BORE OUT-OF-ROUND in this service information. REPAIR as necessary. TEST the system for normal operation. REMOVE and INSPECT the turbocharger. REFER to FUEL CHARGING AND CONTROLS - TURBOCHARGER article. REPAIR as necessary. TEST the system for normal operation.
Insufficient power	Inoperative or damaged fuel system Oil level too high Incorrect engine oil Low oil pressure Excessive accessory drive belt loading Inoperative or damaged cooling system Damaged or plugged exhaust system Incorrect tire size Dragging brakes Slipping transmission Malfunctioning hydraulic lash adjuster Compression leakage at valve seat Seized valve stem Weak or broken valve spring Worn or damaged camshaft Damaged head gasket(s) Cracked or distorted cylinder head(s) Damaged, worn or sticking piston ring(s) Worn or damaged piston Worn or damaged cylinder Boost leaks or blockage Damaged turbocharger	REFER to the INTRODUCTION article. DRAIN oil to correct level. INSTALL correct specification engine oil. CARRY OUT the Oil Pressure Test in this service information. If not within specifications, GO to the LOW OIL PRESSURE TEST in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the accessory drive system for damage. REFER to ENGINE ACCESSORY DRIVE BELTS article. REPAIR as necessary. TEST the system for normal operation. INSPECT the cooling system for damage. REFER to ENGINE COOLING - DIESEL ENGINE article. REPAIR as necessary. TEST the system for normal operation. INSPECT the exhaust system for flow and damage. REFER to EXHAUST SYSTEM article. REPAIR as necessary. TEST the system for normal operation. REFER to SUSPENSION SYSTEM - GENERAL INFORMATION article. REFER to BRAKE SYSTEM - GENERAL INFORMATION article. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - TORQSHIFT6 article. INSPECT the hydraulic lash adjuster for wear or damage. REFER to HYDRAULIC LASH ADJUSTER INSPECTION in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the valve(s) and valve seat(s) for wear. REFER to VALVE INSPECTION and Valve Seat Inspection in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the valve for wear or damage. REFER to VALVE INSPECTION in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the valve spring. REFER to VALVE SPRING FREE LENGTH in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the camshaft for wear or damage. REFER to CAMSHAFT LOBE LIFT in this service information. REPAIR as necessary. TEST the system for normal operation. REMOVE the cylinder head(s). REFER to CYLINDER HEAD in this service information. INSPECT the head gasket(s). REPAIR as necessary. TEST the system for normal operation. REMOVE the cylinder head(s). REFER to CYLINDER HEAD in this service information. INSPECT the cylinder head(s). REPAIR as necessary. TEST the system for normal operation. INSPECT the piston(s) and cylinder block for wear. REFER to PISTON INSPECTION and CYLINDER BORE OUT-OF-ROUND in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the piston for damage. REFER to PISTON INSPECTION in this service information. REPAIR as necessary. TEST the system for normal operation. INSPECT the cylinder for damage. REFER to CYLINDER BORE OUT-OF-ROUND in this service information. REPAIR as necessary. TEST the system for normal operation. CHECK the air intake ducts, Air Cleaner (ACL), CAC pipes and CAC for leaks and correct fit. REFER to INTAKE AIR DISTRIBUTION SYSTEM & INTAKE AIR FILTERING SYSTEM article. REPAIR as necessary. TEST the system for normal operation. REMOVE and INSPECT the turbocharger. REFER to FUEL CHARGING AND CONTROLS - TURBOCHARGER article. REPAIR as necessary. TEST the system for normal operation.
Low oil pressure	Inaccurate gauge reading Low oil level Oil dilution (fuel) Stuck open oil pressure regulator Scored/damaged oil pump Broken or damaged piston cooling tubes Front cover gasket leaks Leaking/missing core plugs Worn/damaged/missing bearing shell(s) Restriction in the pickup tube or oil pan External oil leaks	DIAGNOSE the Instrument Panel Cluster (IPC). REFER to INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article. ADJUST the oil level. INSPECT the fuel injectors. REFER to FUEL CHARGING AND CONTROLS - 6.7L DIESEL article. REPAIR as necessary. TEST the system for normal operation. INSTALL a new engine front cover. REFER to ENGINE FRONT COVER in this service information. TEST the system for normal operation. INSTALL a new engine front cover. REFER to ENGINE FRONT COVER in this service information. TEST the system for normal operation. REMOVE the upper oil pan. REFER to OIL PAN - UPPER in this service information. INSPECT the piston cooling tubes. REPAIR as necessary. TEST the system for normal operation. REMOVE the engine front cover. REFER to ENGINE FRONT COVER in this service information. INSPECT the gasket. REPAIR as necessary. TEST the system for normal operation. INSPECT for leaking/missing core plugs. REFER to CORE PLUG REPLACEMENT in this service information. REPAIR as necessary. TEST the system for normal operation. CHECK the crankshaft main bearings and connecting rod bearings. CARRY OUT the Crankshaft Main Bearing Journal-to-Bearing Clearance and Connecting Rod Bearing Journal-to-Bearing Clearance procedure in this service information. REPAIR as necessary. TEST the system for normal operation. REMOVE the upper oil pan. REFER to OIL PAN - UPPER in this service information. INSPECT the oil pan and pickup tube. REPAIR as necessary. TEST the system for normal operation. INSPECT the engine for oil leaks. REPAIR as necessary. TEST the system for normal operation.
Oil in coolant	Damaged head gasket(s) Leaking oil cooler Damaged cylinder head(s)	REMOVE the cylinder head(s). REFER to CYLINDER HEAD in this service information. INSPECT the head gasket(s). REPAIR as necessary. TEST the system for normal operation. REMOVE the oil cooler. REFER to OIL COOLER in this service information. INSPECT the oil cooler. REPAIR as necessary. TEST the system for normal operation. REMOVE the cylinder head(s). REFER to CYLINDER HEAD in this service information. INSPECT the cylinder head(s). REPAIR as necessary. TEST the system for normal operation.
Coolant in oil	Damaged head gasket(s) Leaking oil cooler Damaged cylinder head(s) Leaking turbocharger base gasket RH valve cover or gasket Engine front cover Cracked engine block	REMOVE the cylinder head(s). REFER to CYLINDER HEAD in this service information. INSPECT the head gasket(s). REPAIR as necessary. TEST the system for normal operation. REMOVE the oil cooler. REFER to OIL COOLER in this service information. INSPECT the oil cooler. REPAIR as necessary. TEST the system for normal operation. REMOVE the cylinder head(s). REFER to CYLINDER HEAD in this service information. INSPECT the cylinder head(s). REPAIR as necessary. TEST the system for normal operation. REMOVE the turbocharger. REFER to FUEL CHARGING AND CONTROLS - TURBOCHARGER article. REPAIR as necessary. TEST the system for normal operation. REMOVE the RH valve cover. REFER to VALVE COVER - RH in this service information. INSPECT the valve cover and gasket. REPAIR as necessary. TEST the system for normal operation. REMOVE the engine front cover. REFER to ENGINE FRONT COVER in this service information. INSPECT the engine front cover gaskets. REPAIR as necessary. TEST the system for normal operation. REPLACE the engine block. REFER to ENGINE in this service information. REPAIR as necessary. TEST the system for normal operation.