Symptom Chart

Condition	Possible Sources	Action
Loss of power/performance	Clogged Air Cleaner (ACL) element	INSTALL a new ACL element. Refer to Intake Air Distribution and Filtering . TEST the system for normal operation.
Loose connections or damage to air intake hoses and tubes		TIGHTEN the hose clamps. INSPECT for damage and REPAIR as necessary.
Malfunctioning fuel system		Refer to the ENGINE CONTROLS - SYMPTOM CHARTS (EXCEPT DIESEL & HYBRID) .
Poor fuel quality		DRAIN and FILL with fresh fuel.
Engine wear (piston rings, valve guides)		REPAIR as required.
Turbocharger turbine or compressor wheel damage		INSPECT the turbocharger. Refer to Check for Free Rotation -- Off Vehicle
Damaged exhaust or exhaust leaks at turbocharger housing		INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as required.
Malfunctioning turbocharger bypass valve		Refer to ENGINE CONTROLS - SYMPTOM CHARTS (EXCEPT DIESEL & HYBRID) .
Obstructed wastegate actuator linkage		INSPECT the suspect turbocharger wastegate linkage for obstruction. REPAIR as necessary.
Damaged wastegate actuator linkage		INSPECT the turbocharger wastegate linkage for damage. INSTALL a new turbocharger.
Wastegate actuator operation		TEST the wastegate actuator operation. Refer to ENGINE CONTROLS - DIAGNOSTIC METHODS (EXCEPT DIESEL & HYBRID) .
PCM -- DTCs		Refer to Electronic Engine Controls DTC Chart: PCM
Excessive oil consumption	Incorrect type or grade of oil	DRAIN and FILL with specified oil.
Oil in the cylinder head to turbocharger flange		REPAIR as required.
Clogged ACL element		INSTALL a new ACL element. Refer to Intake Air Distribution and Filtering . TEST the system for normal operation.
Blocked or restricted turbocharger oil drain tube		INSPECT the turbocharger oil drain tube. REPAIR as necessary.
Damaged or collapsed air intake hoses and tubes		TIGHTEN hose clamps. INSPECT for damage and REPAIR as necessary.
Damaged exhaust or exhaust leaks at turbocharger housing to cylinder head		INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as required.
Turbocharger oil seals leaking		Refer to Turbocharger Internal Oil Leak Test .
Damaged crankcase ventilation system		Visually INSPECT the crankcase ventilation system.
Excessive noise	Turbocharger compressor air intake pipe leaking	REPAIR or INSTALL a new pipe as required.
Loose connections or damage to air intake hoses and tubes		TIGHTEN hose clamps. INSPECT for damage and REPAIR as necessary.
Air leaks at turbine housing, blown joints or damaged exhaust		INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as required.
Carbon build up in the turbine housing causing contact with turbine wheel		INSPECT the turbocharger. Refer to the Check for Free Rotation -- Off Vehicle .
Turbocharger imbalance due to foreign object/damage		REPAIR as required.
Turbine bearing failure		INSPECT the turbocharger. Refer to the Check for Free Rotation -- Off Vehicle .
Inoperative turbocharger bypass valve		Refer to ENGINE CONTROLS - DIAGNOSTIC METHODS (EXCEPT DIESEL & HYBRID) .
Engine emits excessive smoke (black/blue/white)	Clogged ACL element	INSTALL a new ACL element. Refer to Intake Air Distribution and Filtering . TEST the system for normal operation.
Incorrect type or grade of oil		DRAIN and FILL with specified oil.
Blocked or restricted turbocharger oil drain tube		INSPECT the turbocharger oil drain tube. REPAIR as necessary.
Damaged/restricted or leaking turbocharger compressor air intake pipe		REPAIR or INSTALL a new pipe as required.
Engine wear (piston rings, valve guides)		REPAIR as required.
Plugged crankcase ventilation system		Visually INSPECT the crankcase ventilation system.
Turbocharger oil seals leaking		Refer to Turbocharger Internal Oil Leak Test .