rough idle

1990 SUBARU LEGACY
188 MILES • 4 CYL • FWD • AUTOMATIC
Avatar
RAGULA907
  • MEMBER
  • 1 POST
Runs fine cold, but after car warms up it seems like its missfireing and causes a rough idle. already changed(IAC,TPS,ECTS,COIL,PLUGS,ENGINE KNOCK SENSOR,FUEL FILTER,FRONT AND REAR CATALYTIC CONVERTERS)
Feb 17, 2011 at 7:38 PM
Advertisement
Avatar
RASMATAZ
  • CERTIFIED EXPERT
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs
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
12.Mass Airflow Sensor
13.Idle air control valve

Note: If it doesn't apply disregard it-
Mar 21, 2011 at 2:44 AM