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Idle

Tiny
MCCALLWW
  • MEMBER
  • 1998 PONTIAC SUNFIRE
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 100,500 MILES
1998 sunfire lopes at idle no engine light on. What is the cause
Wednesday, July 27th, 2011 AT 11:01 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light and when was last tune-up??

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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Wednesday, July 27th, 2011 AT 11:05 PM
Tiny
MCCALLWW
  • MEMBER
  • 2 POSTS
Yes I do have a engine light it is not on. Last tune up 1 year ago. Runs fine on the road
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Wednesday, July 27th, 2011 AT 11:22 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try replacing the sparkplugs and see what happens and follow-up on what I've suggested-
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Wednesday, July 27th, 2011 AT 11:31 PM

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