1991 Mercedes Benz 500sl misfires

Tiny
GFREUD
  • MEMBER
  • 1991 MERCEDES BENZ 500SL
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Why does my car misfire only after it is fully warmed up and driven a few miles?
Sunday, July 25th, 2010 AT 2:52 PM

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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Sunday, July 25th, 2010 AT 11:58 PM

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