1990 Oldsmobile Ciera rough idling

1990 OLDSMOBILE CIERA
90,000 MILES • 4 CYL • 2WD • AUTOMATIC
Avatar
ANTSMITH
  • MEMBER
  • 1 POST
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.
Nov 8, 2010 at 9:53 PM
Advertisement
Avatar
RASMATAZ
  • CERTIFIED EXPERT
  • 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
Nov 9, 2010 at 2:26 AM