Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
Difficult starting	Damaged ignition system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Damaged fuel system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Damaged starting system.	Refer to STARTERS . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Damaged charging system/battery.	REFER to GENERATORS & REGULATORS .
	Burnt valve.	INSTALL a new valve.
	Worn piston.	INSTALL a new piston.
	Worn piston rings.	INSTALL new piston rings.
	Worn cylinder.	REPAIR or INSTALL a new cylinder block.
	Damaged head gasket.	INSTALL a new head gasket.
	Damaged cooling system.	Refer to ENGINE COOLING . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
Poor idling	Vacuum leaks.	Repair as necessary.
	Malfunctioning or damaged ignition system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Malfunctioning or damaged fuel system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Damaged valve tappet or lash adjuster.	INSTALL a new valve tappet or lash adjuster.
	Damaged valve tappet guide or lash adjuster.	INSTALL a new valve tappet guide or valve tappet.
	Incorrect valve-to-valve seat contact.	REPAIR or INSTALL a new valve or valve seat.
	Damaged head gasket.	INSTALL a new head gasket.
Abnormal combustion	Malfunctioning or damaged fuel system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Malfunctioning or damaged ignition system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Malfunctioning or damaged air intake system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Damaged valve tappet or lash adjuster.	INSTALL a new valve tappet or lash adjuster.
	Damaged valve tappet guide or valve tappet.	INSTALL a new valve tappet guide or valve tappet.
	Burnt or sticking valve.	REPAIR or INSTALL a new valve.
	Weak or broken valve spring.	INSTALL a new valve spring.
	Carbon accumulation in combustion chamber.	ELIMINATE carbon buildup.
Excessive oil consumption	Leaking oil.	REPAIR oil leakage.
	Malfunctioning PCV system.	REPAIR or INSTALL new necessary components.
	Worn valve stem seal.	INSTALL a new valve stem seal.
	Worn valve stem or valve guide.	INSTALL a new valve and valve guide.
	Sticking piston rings.	REPAIR or INSTALL new piston rings.
	Worn piston ring groove.	INSTALL a new piston and piston pin.
	Worn piston or cylinder.	REPAIR or INSTALL a new piston or cylinder block.
Engine noise	Leaking exhaust system.	REPAIR exhaust leakage.
	Incorrect drive belt tension.	REFER to SPECIFICATIONS & DRIVE BELT ROUTING .
	Malfunctioning generator bearing.	Refer to GENERATORS & REGULATORS .
	Malfunctioning coolant pump bearing.	REFER to ENGINE COOLING .
	Malfunctioning or damaged cooling system.	REFER to ENGINE COOLING .
	Malfunctioning or damaged fuel system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Loose timing chain/belt (6268).	ADJUST or INSTALL a new timing chain/belt.
	Damaged timing chain tensioner (6L206).	INSTALL a new timing chain tensioner.
	Excessive main bearing clearance	ADJUST clearance or INSTALL a new crankshaft main bearing (6333).
	Seized or heat damaged crankshaft main bearing.	INSTALL a new crankshaft main bearing.
	Excessive crankshaft end play.	INSTALL a new thrust bearing or crankshaft (6303).
	Excessive connecting rod bearing clearance.	INSTALL a new connecting rod bearing or connecting rod (6200).
	Heat damaged connecting rod bearing (6211).	Install a new connecting rod bearing.
	Damaged connecting rod bushing.	INSTALL a new connecting rod bushing.
	Worn cylinder.	REPAIR or INSTALL a new cylinder block (6010).
	Worn piston (6108) or piston pin (6135).	INSTALL a new piston or piston pin.
	Damaged piston rings.	INSTALL new piston rings.
	Bent connecting rod.	INSTALL a new connecting rod.
	Malfunctioning valve tappet (6500) or lash adjuster.	INSTALL a new valve tappet or lash adjuster.
	Excessive valve tappet or lash adjuster clearance.	ADJUST clearance or INSTALL a new valve tappet guide or valve tappet.
	Broken valve spring (6513).	INSTALL a new valve spring.
	Excessive valve guide clearance.	ADJUST clearance or INSTALL a new valve guide or valve (6510).
Insufficient power	Malfunctioning or damaged ignition system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Malfunctioning or damaged fuel system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Malfunctioning or damaged air intake system.	Refer to SYSTEM & COMPONENT TESTING - GASOLINE . REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE .
	Damaged or plugged exhaust system.	INSPECT exhaust system.
	Incorrect tire size.	REFER to WHEELS & TIRES .
	Dragging brakes.	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
	Slipping transmission.	Refer to the AUTOMATIC TRANSAXLE/TRANSMISSION .
	Malfunctioning valve tappet or lash adjuster.	INSTALL a new valve tappet or lash adjuster.
	Damaged valve tappet guide or valve tappet.	INSTALL a new valve tappet guide or valve tappet.
	Compression leakage at valve seat.	REPAIR or INSTALL a new valve, valve seat or cylinder head (6049).
	Seized valve stem.	INSTALL a new valve.
	Weak or broken valve spring.	INSTALL a new valve spring.
	Worn or damaged camshaft.	INSTALL a new camshaft.
	Damaged head gasket.	INSTALL a new head gasket.
	Cracked or distorted cylinder head.	INSTALL a new cylinder head.
	Damaged, worn or sticking piston ring (s).	REPAIR or INSTALL a new piston ring(s).
	Worn or damaged piston.	INSTALL a new piston and piston pin.