Engine Performance Diagnostic Table
WARNING: This page is about a different variant/trim than selected.
| 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. | |
| 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 COIL, IGNITION, REMOVAL AND INSTALLATION . | |
| 5. Incorrect spark plug gap | 5. Set gap. Refer to appropriate service information . | |
| 6. Incorrect cam timing | 4. Verify cam timing. Refer to CHAIN AND SPROCKETS, TIMING, REMOVAL AND INSTALLATION . | |
| 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 SENSOR, CAMSHAFT POSITION, REMOVAL AND INSTALLATION . | |
| 10. Faulty Crankshaft Position (CKP) sensor | 10. Replace Crankshaft Position (CKP) sensor. Refer to SENSOR, CRANKSHAFT POSITION, 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 CHAIN AND SPROCKETS, TIMING, REMOVAL AND INSTALLATION . | |
| 5. Vacuum leak | 5. Inspect intake manifold and vacuum hoses, repair or replace as necessary. | |
| 6. Faulty Crankshaft Position (CKP) sensor | 6. Replace the CKP sensor. Refer to SENSOR, CRANKSHAFT POSITION, 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 MODULE, FUEL PUMP, REMOVAL AND INSTALLATION . | |
| 4. Incorrect cam timing | 4. Verify cam timing. Refer to CHAIN AND SPROCKETS, TIMING, REMOVAL AND INSTALLATION . | |
| 5. Leaking cylinder head gasket | 5. Replace cylinder head gasket. Refer to CYLINDER HEAD, REMOVAL AND INSTALLATION . | |
| 6. Low compression | 6. Determine the cause and repair as necessary. Refer to appropriate service information . | |
| 7. Burned, warped or pitted valves | 7. Replace cylinder head. Refer to CYLINDER HEAD, REMOVAL AND INSTALLATION . | |
| 8. Plugged or restricted exhaust system | 8. Perform exhaust restriction test. Install new parts, as necessary. | |
| 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 cylinder head. Refer to CYLINDER HEAD, 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). |