Symptom Chart

WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible	Sources Action
Loss of power/performance	Clogged Air Cleaner (ACL) element	INSTALL a new ACL element. REFER to AIR CLEANER -- 3.5L GTDI . 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 - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) .
	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 the CHECK FOR FREE ROTATION - OFF VEHICLE in this information.
	Damaged exhaust or exhaust leaks at turbocharger housing or exhaust manifolds	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 the ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) .
	Obstructed wastegate actuator linkage	INSPECT the suspect turbocharger wastegate linkage for obstruction. REPAIR as necessary.
	Damaged wastegate actuator linkage	INSPECT the suspect turbocharger wastegate linkage for damage. INSTALL a new turbocharger.
	Wastegate actuator operation	TEST the wastegate actuator operation. REFER to the ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) .
	PCM - DTCs	REFER to the ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) .
Excessive oil consumption	Incorrect type or grade of oil	DRAIN and FILL with specified oil.
	Oil in exhaust manifolds	REPAIR as required.
	Clogged ACL element	INSTALL a new ACL element. REFER to AIR CLEANER -- 3.5L GTDI . TEST the system for normal operation.
	Blocked or restricted turbocharger oil drain pipes	INSPECT the turbocharger oil drain pipes. 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 or exhaust manifolds	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 in this information.
	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 in this information.
	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 in this information.
	Inoperative turbocharger bypass valve	REFER to the ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) .
Engine emits excessive smoke (black/blue/white)	Clogged ACL element	INSTALL a new ACL element. REFER to AIR CLEANER -- 3.5L GTDI . TEST the system for normal operation.
	Incorrect type or grade of oil	DRAIN and FILL with specified oil.
	Blocked or restricted turbocharger oil drain pipes	INSPECT the turbocharger oil drain pipes. 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 in this information.