CONDITION POSSIBLE CAUSE CORRECTION
ENGINE LOSS OF
POWER
1. Dirty or incorrectly gapped plugs. 1. Clean plugs and set gap. Refer to
IGNITION SYSTEM.
2. Contamination in fuel system. 2. Clean system and replace fuel filter.
3. Faulty fuel pump. 3. Test and replace as necessary. Refer
to FUEL SYSTEM.
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. Install new parts, as necessary.
9. Faulty coil(s). 9. Test and replace as necessary. Refer
to IGNITION SYSTEM.
ENGINE MISSES ON
ACCELERATION
1. Dirty or incorrectly gapped spark
plugs.
1. Clean spark plugs and set gap. Refer
to IGNITION SYSTEM.
2. Contamination in Fuel System. 2. Clean fuel system and replace fuel
filter.
3. Burned, warped, or pitted valves. 3. Replace valves.
4. Faulty coil(s). 4. Test and replace as necessary. Refer
to IGNITION SYSTEM.
ENGINE MISSES AT HIGH
SPEED
1. Dirty or incorrect spark plug gap. 1. Clean spark plugs and set gap. Refer
to IGNITION SYSTEM.
2. Faulty coil(s). 2. Test and replace as necessary. Refer
to IGNITION SYSTEM.
3. Dirty fuel injector(s). Test and replace as necessary. Refer to
FUEL SYSTEM.
4. Contamination in fuel system. 4. Clean system and replace fuel filter.
9 - 14 2.7L ENGINE LH
DIAGNOSIS AND TESTING (Continued)
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