1999 Subaru Forester rough idle

Tiny
YOSHI01
  • MEMBER
  • 1999 SUBARU FORESTER
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 93,000 MILES
Put new plugs and wires in on Saturday, but car idles rough. Runs fine going down road.
Wednesday, June 9th, 2010 AT 4:54 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following-inspect and test all the following below:
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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Wednesday, June 9th, 2010 AT 5:37 PM

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