Mechanics

ROUGH/MISSING ENGINE

1992 Lexus SC 400

Engine Performance problem
1992 Lexus SC 400 V8 Two Wheel Drive Automatic 167, 00 miles

Runs rough/missing when engine is cold, once warm
engine runs fine.
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Japan748
August 6, 2010.



Engine running rough or misfiring can be cause by the following: 1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Idle air control valve.

Rasmataz
Aug 7, 2010.