Engine Performance Diagnostic Table

CONDITION	POSSIBLE CAUSE	CORRECTION
ENGINE WILL NOT START	1. Weak battery	1. Charge or replace as necessary. Refer to BATTERY, DIAGNOSIS AND TESTING .
	2. Corroded or loose battery connections	2. Clean and tighten battery connections. Refer to CLEANING .
	3. Faulty engine starting system	3. Diagnose engine starting system. Refer to DIAGNOSIS AND TESTING .
	4. Faulty coil(s) or control unit	4. Replace ignition coil. Refer to 3.2L .
	5. Incorrect spark plug gap	5. Set gap. Refer to SPARK PLUG .
	6. Incorrect cam timing	6. Verify cam timing. Refer to ENGINE/VALVE TIMING - STANDARD PROCEDURE .
	7. Contamination of the fuel system	7. Clean fuel system and replace fuel filter.
	8. Faulty fuel pump or wiring	8. Repair or replace as necessary.
	9. Faulty Camshaft Position (CMP) sensor	9. Replace the Camshaft Position (CMP) sensor. Refer to 3.2L .
	10. Faulty Crankshaft Position (CKP) sensor	10. Replace Crankshaft Position (CKP) sensor. Refer to 3.2L .
ENGINE STALLS OR ROUGH IDLE	1. Idle speed too low	1. Refer to the appropriate diagnostic information.
	2. Incorrect fuel mixture	2. Refer to the appropriate diagnostic information.
	3. Faulty ignition coil(s)	3. Replace ignition coil. Refer to 3.2L .
	4. Incorrect cam timing	4. Verify cam timing. Refer to ENGINE/VALVE TIMING - STANDARD PROCEDURE .
	5. Vacuum leak	5. Inspect intake manifold and vacuum hoses, repair or replace as necessary.
	6. Faulty Crankshaft Position (CKP) sensor	6. Replace CKP sensor. Refer to 3.2L .
ENGINE LOSS OF POWER	1. Dirty or incorrectly gapped spark plugs	1. Correct as necessary. Refer to 3.2L .
	2. Contamination in fuel system	2. Clean system and replace fuel filter.
	3. Faulty fuel pump	3. Test and replace the fuel pump. Refer to MODULE, FUEL PUMP, REMOVAL .
	4. Incorrect cam timing	4. Verify cam timing. Refer to ENGINE/VALVE TIMING - STANDARD PROCEDURE .
	5. Leaking cylinder head gasket	5. Replace cylinder head gasket. Refer to CYLINDER HEAD, REMOVAL .
	6. Low compression	6. Determine the cause and repair as necessary. Refer to DIAGNOSIS AND TESTING .
	7. Burned, warped or pitted valves	7. Replace valves as necessary. Refer to VALVES, INTAKE AND EXHAUST, REMOVAL .
	8. Plugged or restricted exhaust system	8. Perform exhaust restriction test. Refer to RESTRICTION CHECK . Install new parts as necessary.
	9. Faulty ignition coil	9. Test and replace ignition coil. Refer to 3.2L .
ENGINE MISSES ON ACCELERATION	1. Dirty or incorrectly gapped spark plugs	1. Clean spark plugs and set gap. Refer to 3.2L .
	2. Contamination in Fuel System	2. Clean fuel system and replace fuel filter.
	3. Burned, warped or pitted valves	3. Replace valves as necessary. Refer to VALVES, INTAKE AND EXHAUST, REMOVAL .
	4. Faulty ignition coil	4. Test and replace ignition coil. Refer to 3.2L .
ENGINE MISSES AT HIGH SPEED	1. Dirty or incorrectly gapped spark plugs	1. Correct as necessary. Refer to 3.2L .
	2. Faulty ignition coil	2. Test and replace ignition coil. Refer to 3.2L .
	3. Contamination in fuel system	3. Clean system and replace fuel filter.
	4. Dirty fuel injector(s)	4. Test and replace as necessary (Refer to Appropriate Diagnostic Information).