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1990 Oldsmobile Ciera rough idling

Tiny
ANTSMITH
  • MEMBER
  • 1990 OLDSMOBILE CIERA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
I changed the valve cover gaskets on my car. In the process, I bent the egr valve while trying to remove it. After I finished replacing the gasket. I cleaned the engine at a car wash. The car has be idling very rough since then.
Monday, November 8th, 2010 AT 9:53 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. Manifold absolute pressure sensor
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Tuesday, November 9th, 2010 AT 2:26 AM

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