Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
No boost/low boost/lack of power	Clogged air cleaner element or restriction upstream of compressor.	INSTALL a new air cleaner element. REMOVE the restriction.
	Compressor air intake hose collapsed.	REPAIR or INSTALL a new hose as required.
	Compressor manifold hoses leaking.	TIGHTEN hose clamps.
	Turbocharger turbine or compressor wheel damage.	INSTALL a new turbocharger.
	Turbocharger bearings seized.	INSTALL a new turbocharger.
	Turbocharger variable vane hydraulic control valve not functioning.	REFER to the INTRODUCTION - GASOLINE article .
	Damaged charge air cooler (CAC).	REPAIR or INSTALL a new charge air cooler (CAC).
	Damaged/defective manifold absolute pressure (MAP) sensor or hose.	INSTALL a new MAP sensor or hose.
	Low compression.	REPAIR as required.
	Clogged air cleaner element or restriction upstream of compressor.	INSTALL a new air cleaner element. REMOVE the restriction.
	Insufficient fuel supply.	REPAIR or INSTALL new fuel system components as required.
	Exhaust leak between manifold and turbine housing.	REPAIR as needed.
Excessive fuel consumption (black exhaust smoke)	High fuel pressure.	REPAIR as required. REFER to the INTRODUCTION - GASOLINE article .
	Fuel pressure regulator.
	Fuel return tube plugged or kinked.	CLEAN or INSTALL a new fuel return tube as required.
	Injectors leaking.	INSTALL new injectors.
	Powertrain control module malfunctioning.	REFER to the INTRODUCTION - GASOLINE article .
Excessive oil consumption (blue, gray or white exhaust smoke)	Incorrect type or grade of oil.	DRAIN and FILL with specified oil.
	Extended oil change intervals.	CHANGE oil as recommended.
	Clogged air cleaner element or restriction upstream of compressor.	REPAIR as required.
	Engine wear (piston rings, valve guides).	REPAIR as required.
	Turbocharger oil seals leaking.	REFER to TURBOCHARGER INTERNAL OIL LEAK TEST in this article.
	Injector or injector O-ring leaking.	REFER to the INTRODUCTION - GASOLINE article .
Noise or vibration	Leaks at turbocharger inlet and outlet connections.	REPAIR as required.
	Foreign object damage to turbine or compressor blades.	INSTALL a new turbocharger.
	Turbine bearing failure.	INSTALL a new turbocharger.
High boost	Leak in exhaust system before muffler.	REPAIR as required.
High boost	Malfunctioning turbocharger variable vane hydraulic control valve.	REFER to the INTRODUCTION - GASOLINE article .