ENGINE PERFORMANCE DIAGNOSTIC TABLE

ENGINE WILL NOT START

1. Weak battery

1. Charge or replace as necessary (Refer to 08 - Electrical/8F - Engine Systems/Battery System/BATTERY - Diagnosis and Testing) .

2. Corroded or loose battery connections.

2. Clean and tighten battery connections (Refer to 08 - Electrical/8F - Engine Systems/Battery System - Cleaning) .

3. Faulty engine starting system.

3. Diagnose engine starting system (Refer to 08 - Electrical/8F - Engine Systems/Starting - Diagnosis and Testing)

4. Faulty coil or control unit.

4. Replace ignition coil (Refer to 08 - Electrical/8I - Ignition Control/COIL, Ignition - Removal) .

5. Incorrect spark plug gap.

5. Correct as necessary.

6. Incorrect cam timing.

6. Verify cam timing (Refer to 09 - Engine/Valve Timing - Standard Procedure)

7. Dirt or water in fuel system.

7. Clean fuel system.

8. Faulty fuel pump or wiring.

8. Repair or replace as necessary.

9. Faulty Camshaft Position (CMP) sensor.

9. Replace sensor (Refer to 08 - Electrical/8I - Ignition Control/SENSOR, Camshaft Position - Removal) .

10. Faulty Crankshaft Position (CKP) sensor.

10. Replace sensor (Refer to 14 - Fuel System/Fuel Injection/SENSOR, Crankshaft Position - Removal) .

ENGINE STALLS OR ROUGH IDLE

1. Vacuum leak.

1. Inspect intake manifold and vacuum hoses, repair or replace as necessary.

2. Faulty Crankshaft Position (CKP) sensor.

2. Replace sensor (Refer to 14 - Fuel System/Fuel Injection/SENSOR, Crankshaft Position - Removal) .

3. Faulty ignition coil.

3. Replace ignition coil (Refer to 08 - Electrical/8I - Ignition Control/COIL, Ignition - Removal) .

4. Incorrect cam timing.

4. Verify cam timing (Refer to 09 - Engine/Valve Timing - Standard Procedure)

ENGINE LOSS OF POWER

1. Dirty or incorrectly gapped spark plugs.

1. Correct as necessary (Refer to 08 - Electrical/8I - Ignition Control/SPARK PLUG - Removal) .

2. Dirt or water in fuel system.

2. Clean fuel system.

3. Faulty fuel pump.

3. Replace fuel pump (Refer to 14 - Fuel System/Fuel Delivery/MODULE, Fuel Pump - Removal) .

4. Leaking cylinder head gasket.

4. Replace cylinder head gasket (Refer to 09 - Engine/Cylinder Head - Removal) .

5. Low compression.

5. Determine the cause and repair as necessary (Refer to 09 - Engine - Diagnosis and Testing) .

6. Burned, warped or pitted valves.

6. Replace as necessary (Refer to 09 - Engine/Cylinder Head/VALVES, Intake and Exhaust - Removal) .

7. Plugged or restricted exhaust system.

7. Inspect and replace as necessary.

8. Faulty ignition coil.

8. Replace ignition coil (Refer to 08 - Electrical/8I - Ignition Control/COIL, Ignition - Removal) .

9. Incorrect cam timing.

9. Verify cam timing (Refer to 09 - Engine/Valve Timing - Standard Procedure)

ENGINE MISSES ON ACCELERATION

1. Dirty or incorrectly gapped spark plugs.

1. Correct as necessary (Refer to 08 - Electrical/8I - Ignition Control/SPARK PLUG - Removal) .

2. Dirt in fuel system.

2. Clean fuel system.

3. Burned, warped or pitted valves.

3. Replace as necessary (Refer to 09 - Engine/Cylinder Head/VALVES, Intake and Exhaust - Removal) .

4. Faulty ignition coil.

4. Replace ignition coil (Refer to 08 - Electrical/8I - Ignition Control/COIL, Ignition - Removal) .

ENGINE MISSES AT HIGH SPEED

1. Dirty or incorrectly gapped spark plugs.

1. Correct as necessary (Refer to 08 - Electrical/8I - Ignition Control/SPARK PLUG - Removal) .

4. Faulty ignition coil.

2. Replace ignition coil (Refer to 08 - Electrical/8I - Ignition Control/COIL, Ignition - Removal) .

3. Dirt or water in fuel system.

3. Clean fuel system.