| ENGINE WILL NOT START |
1. Weak battery |
1. Charge or replace as necessary. |
| 2. Corroded or loose battery connections. |
2. Clean and tighten battery connections. |
| 3. Faulty engine starting system |
3. Diagnose engine starting system. Refer to DIAGNOSIS AND TESTING - STARTING SYSTEM
. |
| 4. Faulty coil(s) or control unit |
4. Replace ignition coil. Refer to COIL, IGNITION, REMOVAL AND INSTALLATION
. |
| 5. Incorrect spark plug gap |
5. Set gap. Refer to ENGINE SPECIFICATIONS
. |
| 6. Incorrect cam timing |
6. Verify cam timing. Refer to ENGINE TIMING VERIFICATION
. |
| 7. Contamination in 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 ENGINE SENSORS, REMOVAL AND INSTALLATION . |
| 10. Faulty Crankshaft Position (CKP) sensor |
10. Replace Crankshaft Position (CKP) sensor. Refer to ENGINE SENSORS, REMOVAL AND INSTALLATION . |
| ENGINE STALLS OR ROUGH IDLE |
1. Idle speed too low |
1. Test minimum air flow. (Refer to Appropriate Diagnostic Information) |
| 2. Incorrect fuel mixture |
2. Refer to Appropriate Diagnostic Information). |
| 3. Faulty ignition coil(s) |
3. Replace ignition coil. Refer to COIL, IGNITION, REMOVAL AND INSTALLATION
. |
| 4. Incorrect cam timing |
4. Verify cam timing. Refer to ENGINE TIMING VERIFICATION
. |
| 5. Vacuum leak |
5. Inspect the intake manifold and vacuum hoses, repair or replace as necessary. |
| 6. Faulty Crankshaft Position (CKP) sensor |
6. Replace the CKP sensor. Refer to ENGINE SENSORS, REMOVAL AND INSTALLATION . |
| ENGINE LOSS OF POWER |
1. Dirty or incorrectly gapped spark plugs |
1. Correct as necessary. Refer to SPARK PLUG, REMOVAL AND INSTALLATION
. |
| 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 ASSEMBLY, FUEL PUMP, REMOVAL AND INSTALLATION . |
| 4. Incorrect cam timing |
4. Verify cam timing. Refer to ENGINE TIMING VERIFICATION
. |
| 5. Leaking cylinder head gasket |
5. Replace cylinder head gasket. Refer to CYLINDER HEAD ASSEMBLY, REMOVAL AND INSTALLATION . |
| 6. Low compression |
6. Determine the cause and repair as necessary. Refer to CYLINDER COMPRESSION TEST
. |
| 7. Burned, warped or pitted valves |
7. Replace valves as necessary. Refer to VALVES, INTAKE AND EXHAUST, REMOVAL AND INSTALLATION . |
| 8. Plugged or restricted exhaust system |
8. Perform exhaust restriction test. Install new parts, as necessary. Refer to EXHAUST SYSTEM, DIAGNOSIS AND TESTING
. |
| 9. Faulty ignition coil |
9. Test and replace ignition coil. Refer to COIL, IGNITION, REMOVAL AND INSTALLATION
. |
| ENGINE MISSES ON ACCELERATION |
1. Dirty or incorrectly gapped spark plugs |
1. Clean spark plugs and set gap. Refer to SPARK PLUG, REMOVAL AND INSTALLATION
. |
| 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 AND INSTALLATION . |
| 4. Faulty ignition coil |
4. Test and replace ignition coil. Refer to COIL, IGNITION, REMOVAL AND INSTALLATION
. |
| ENGINE MISSES AT HIGH SPEED |
1. Dirty or incorrectly gapped spark plugs |
1. Correct as necessary. Refer to SPARK PLUG, REMOVAL AND INSTALLATION
. |
| 2. Faulty ignition coil |
2. Test and replace ignition coil. Refer to COIL, IGNITION, REMOVAL AND INSTALLATION
. |
| 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). |