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Rough idle

Tiny
RAGULA907
  • MEMBER
  • 1990 SUBARU LEGACY
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 188 MILES
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)
Thursday, February 17th, 2011 AT 7:38 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 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-
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Monday, March 21st, 2011 AT 2:44 AM

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