| ENGINE WILL NOT START |
1. Weak battery. |
1. Test battery. Charge or replace as necessary. Refer to DIAGNOSIS AND TESTING
. |
| 2. Corroded or loose battery connections. |
2. Clean and tighten battery connections. Apply a coat of light mineral grease to terminals. |
| 3. Faulty starter. |
3. Test starting system. Check for codes. (Refer to DIAGNOSIS AND TESTING
) |
| 4. Faulty coil(s) or control unit. |
4. Test and replace as needed. (Refer to CHECKING THE IGNITION COIL OPERATION
) |
| 5. Incorrect spark plug gap. |
5. Set gap. Refer to SPECIFICATIONS
. |
| 6. Contamination in fuel system. |
6. Clean system and replace fuel filter. |
| 7. Faulty fuel pump. |
7. Test fuel pump and replace as needed. (Refer to FUEL SYSTEM
) |
| 8. Incorrect engine timing. |
8. Check for a skipped timing belt/chain. |
| ENGINE STALLS OR IDLES ROUGH |
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. Intake manifold leakage. |
3. Inspect intake manifold, manifold gasket, and vacuum hoses. |
| 4. Faulty ignition coil(s). |
4. Test and replace as necessary. (Refer to Appropriate Diagnostic Information) |
| 5. Contamination in Oil Control Valve (OCV). |
5. Remove OCV and inspect for contamination. Replace OCV if contaminated. |
| ENGINE LOSS OF POWER |
1. Dirty or incorrectly gapped plugs. |
1. Clean plugs and set gap. |
| 2. Contamination in fuel system. |
2. Clean system and replace fuel filter. |
| 3. Faulty fuel pump. |
3. Test and replace as necessary. (Refer to Appropriate Diagnostic Information) |
| 4. Incorrect valve timing. |
4. Correct valve timing. |
| 5. Leaking cylinder head gasket. |
5. Replace cylinder head gasket. |
| 6. Low compression. |
6. Test compression of each cylinder. |
| 7. Burned, warped, or pitted valves. |
7. Replace valves. |
| 8. Plugged or restricted exhaust system. |
8. Perform exhaust restriction test. Install new parts, as necessary. Refer to DIAGNOSIS AND TESTING
. |
| 9. Faulty ignition coil(s). |
9. Test and replace as necessary. (Refer to CHECKING THE IGNITION COIL OPERATION
) |
| ENGINE MISSES ON ACCELERATION |
1. Dirty or incorrectly gapped spark plugs. |
1. Clean spark plugs and set gap. |
| 2. Contamination in Fuel System. |
2. Clean fuel system and replace fuel filter. |
| 3. Burned, warped, or pitted valves. |
3. Replace valves. |
| 4. Faulty ignition coil(s). |
4. Test and replace as necessary. (Refer to CHECKING THE IGNITION COIL OPERATION
) |
| ENGINE MISSES AT HIGH SPEED |
1. Dirty or incorrect spark plug gap. |
1. Clean spark plugs and set gap. |
| 2. Faulty ignition coil(s). |
2. Test and replace as necessary. (Refer to CHECKING THE IGNITION COIL OPERATION |
| 3. Dirty fuel injector(s). |
3. Test and replace as necessary. (Refer to FUEL SYSTEM
) |
| 4. Contamination in fuel system. |
4. Clean system and replace fuel filter. |