Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
Difficult starting	Damaged ignition system.	Refer to the appropriate ENGINE article . REFER to the appropritat POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Damaged fuel system.		Refer to the appropriate ENGINE article . REFER to the appropritat POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Damaged starting system.		Refer to the appropriate ENGINE article . REFER to the appropritat POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
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 the appropriate ENGINE article . REFER to the appropritat POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Poor idling	Vacuum leaks.	refer to the appropriate ENGINE article.
Malfunctioning or damaged ignition system.		Refer to the appropriate ENGINE article . REFER to the appropriate POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Malfunctioning or damaged fuel system.		Refer to the appropriate ENGINE article . REFER to the appropriate POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
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 the appropriate ENGINE article . REFER to the appropriate POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Malfunctioning or damaged ignition system.		Refer to the appropriate ENGINE article . REFER to the appropriate POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Malfunctioning or damaged air intake system.		Refer to the appropriate ENGINE article . REFER to the appropriate POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Damaged valve tappet or lash adjuster. Damaged valve tappet guide or valve tappet. Burnt or sticking valve. Weak or broken valve spring. Carbon accumulation in combustion chamber.		INSTALL a new valve tappet or lash adjuster. INSTALL a new valve tappet guide or valve tappet. REPAIR or INSTALL a new valve. INSTALL a new valve spring. ELIMINATE carbon buildup.
Excessive oil consumption	Leaking oil. Malfunctioning PCV system. Worn valve stem seal. Worn valve stem or valve guide. Sticking piston rings. Worn piston ring groove. Worn piston or cylinder.	REPAIR oil leakage. REPAIR or INSTALL new necessary components. INSTALL a new valve stem seal. INSTALL a new valve and valve guide. REPAIR or INSTALL new piston rings. INSTALL a new piston and piston pin. REPAIR or INSTALL a new piston or cylinder block.
Engine noise	Leaking exhaust system.	REPAIR exhaust leakage.
Incorrect drive belt tension.		Refer to appropriate ENGINE article .
Malfunctioning generator bearing.		refer to the 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 the appropriate ENGINE article . REFER to the appropriate POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Loose timing chain/belt. Damaged timing chain tensioner. Excessive main bearing clearance. 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. Malfunctioning valve tappet or lash adjuster. Excessive valve tappet or lash adjuster clearance. Broken valve spring. Excessive valve guide clearance.		ADJUST or INSTALL a new timing chain/belt. INSTALL a new timing chain tensioner. CAUTION: Remove the cylinder heads before removing the crankshaft. Failure to do so can result in engine damage. ADJUST clearance or INSTALL a new crankshaft main bearing. INSTALL a new crankshaft main bearing. INSTALL a new thrust bearing or crankshaft. INSTALL a new connecting rod bearing or connecting rod. INSTALL a new connecting rod bearing. INSTALL a new connecting rod bushing. REPAIR or INSTALL a new cylinder block. INSTALL a new piston or piston pin. INSTALL new piston rings. INSTALL a new connecting rod. INSTALL a new valve tappet or lash adjuster. ADJUST clearance or INSTALL a new valve tappet guide or valve tappet. INSTALL a new valve spring. ADJUST clearance or INSTALL a new valve guide or valve.
Insufficient power	Malfunctioning or damaged ignition system.	Refer to the appropriate ENGINE article . REFER to the appropriate POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Malfunctioning or damaged fuel system.		Refer to the appropriate ENGINE article . REFER to the appropriate POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
Malfunctioning or damaged air intake system.		Refer to the appropriate ENGINE article . REFER to the appropriate POWERTRAIN CONTROL/EMISSIONS DIAGNOSTIC procedures .
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 DIAGNOSIS - 5R55W/S .
Malfunctioning valve tappet or lash adjuster. Damaged valve tappet guide or valve tappet. Compression leakage at valve seat. Seized valve stem. Weak or broken valve spring. Worn or damaged camshaft. Damaged head gasket. Cracked or distorted cylinder head. Damaged, worn or sticking piston ring(s). Worn or damaged piston.		INSTALL a new valve tappet or lash adjuster. INSTALL a new valve tappet guide or valve tappet. REPAIR or INSTALL a new valve, valve seat or cylinder head. INSTALL a new valve. INSTALL a new valve spring. INSTALL a new camshaft. INSTALL a new head gasket. INSTALL a new cylinder head. REPAIR or INSTALL a new piston ring(s). INSTALL a new piston and piston pin.