1992 Lexus SC 400 ROUGH/MISSING ENGINE

Tiny
JAPAN748
  • MEMBER
  • 1992 LEXUS SC 400
  • V8
  • 2WD
  • AUTOMATIC
  • 16,700 MILES
Runs rough/missing when engine is cold, once warm
engine runs fine.
Friday, August 6th, 2010 AT 11:31 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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Saturday, August 7th, 2010 AT 2:43 AM

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