Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
Difficult starting	Inoperative or damaged ignition system	Refer to the ENGINE IGNITION . See INTRODUCTION - GASOLINE article .
	Air or vacuum leak
	Inoperative or damaged fuel system
	Inoperative or damaged starting system
	Damaged charging system/battery	REFER to CHARGING SYSTEM - GENERAL INFORMATION .
	Burnt valve	INSTALL a new cylinder head.
	Worn piston	INSTALL a new short block.
	Worn piston rings
	Worn cylinder
	Damaged head gasket	INSTALL a new cylinder head gasket.
	Inoperative or damaged cooling system (fail-safe cooling invoked)	Refer to the ENGINE COOLING . See INTRODUCTION - GASOLINE article .
Poor idling	Vacuum leaks	Refer to the appropriate repair procedure. . See INTRODUCTION - GASOLINE article .
	Inoperative or damaged exhaust gas recirculation (EGR) system
	Inoperative or damaged ignition system	Refer to the ENGINE IGNITION .
	Inoperative or damaged cooling system (fail-safe cooling invoked)	Refer to the ENGINE COOLING . See INTRODUCTION - GASOLINE article .
	Inoperative or damaged fuel system
	Incorrect valve clearance	ADJUST valve clearance. Refer to the ENGINE article .
	Incorrect valve-to-valve seat contact	INSTALL a new cylinder head.
	Damaged head gasket	INSTALL a new cylinder head gasket.
Abnormal combustion	Inoperative or damaged fuel system	Refer to the FUEL SYSTEM . See INTRODUCTION - GASOLINE article .
	Air or vacuum leaks
	EGR system fault
	Inoperative or damaged cooling system (fail-safe cooling invoked)
	Inoperative or damaged ignition system
	Burnt or sticking valve	INSTALL a new cylinder head.
	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.
	Inoperative PCV system	REPAIR or INSTALL new components as necessary.
	Incorrect oil	CHANGE oil to correct specification.
	Worn valve stem seal	INSTALL a new valve stem seal.
	Worn valve stem or valve guide	INSTALL a new cylinder head.
	Sticking piston rings	INSTALL a new short block.
	Worn piston ring groove
	Worn piston or cylinder
Engine noise	Leaking exhaust system	REPAIR exhaust leakage.
	Incorrect drive belt tension	Refer to the ACCESSORY DRIVE .
	Worn generator bearing	Refer to the GENERATOR AND REGULATOR .
	Worn or damaged coolant pump bearing	REFER to ENGINE COOLING .
	Inoperative or damaged cooling system	REFER to ENGINE COOLING .
	Inoperative or damaged fuel system	Refer to the FUEL SYSTEM . See INTRODUCTION - GASOLINE article .
	Ignition system knock (spark knock)
	Inoperative or damaged EGR system
	Air leaks
	Loose timing chain	INSTALL a new timing chain.
	Damaged timing chain tensioner	INSTALL a new timing chain tensioner.
	Excessive main bearing clearance	INSTALL a new short block.
	Seized or heat damaged crankshaft main bearing
	Excessive crankshaft end play
	Excessive connecting rod bearing clearance
	Heat damaged connecting rod bearing
	Damaged connecting rod bushing
	Worn cylinder
	Worn piston or piston pin
	Damaged piston rings
	Bent connecting rod
	Worn or damaged valve tappet	INSTALL a new valve tappet.
	Excessive valve tappet clearance	ADJUST clearance or INSTALL a new valve tappet.
	Broken valve spring	INSTALL a new valve spring.
	Excessive valve guide clearance	INSTALL a new cylinder head assembly.
Insufficient power	Inoperative or damaged ignition system	Refer to the ENGINE IGNITION . See INTRODUCTION - GASOLINE article .
	Air intake system blockage
	Lubrication system blockage
	Inoperative or damaged fuel system	Refer to the FUEL SYSTEM . See INTRODUCTION - GASOLINE article .
	Oil level too high	DRAIN oil to correct level.
	Incorrect engine oil	INSTALL correct specification engine oil.
	Excessive accessory drive belt loading	Refer to the ACCESSORY DRIVE . See INTRODUCTION - GASOLINE article .
	Inoperative or damaged cooling system (fail-safe cooling invoked)
	Damaged or plugged exhaust system	INSPECT exhaust system.
	Incorrect tire size	REFER to SUSPENSION SYSTEM-GENERAL INFORMATION .
	Dragging brakes	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
	Slipping transmission	Refer to the AUTOMATIC TRANSAXLE/TRANSMISSION .
	Incorrect valve clearance	ADJUST valve clearance. Refer to the ENGINE .
	Worn or damaged valve tappet	INSTALL a new valve tappet.
	Damaged valve tappet guide	INSTALL a new cylinder head assembly.
	Compression leakage at valve seat
	Seized valve stem
	Weak or broken valve spring	INSTALL a new valve spring.
	Worn or damaged cam	INSTALL a new camshaft.
	Damaged head gasket	INSTALL a new head gasket.
	Cracked or distorted cylinder head	INSTALL a new cylinder head assembly.
	Damaged, worn or sticking piston ring(s)	INSTALL a new short block.
	Worn or damaged piston	INSTALL a new short block.