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1990 Chevy Lumina engine misses

Tiny
WAYNEANG
  • MEMBER
  • 1990 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 138,226 MILES
The car has a steady miss after replacing plugs, plug wires, ignition module, all three coils, checked fuel injectors, changed fuel regulator. What else could be the cause?
Sunday, August 1st, 2010 AT 10:16 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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Sunday, August 1st, 2010 AT 11:08 PM

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