engine is revving on its own

1992 GEO TRACKER
105,000 MILES
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MICHAEL NUNN
  • MEMBER
  • 1 POST
what might be causing my 1992 geo tracker to hesitate and rev frequently before shifting after turning and when first starting out with temperature cold. I have replaced plugs, had auto tran flushed, radiator flushed, fuel filter replaced. Still has same symptoms after replacing all this. Hesitates and revs less frequently after temperature is normal, but I can still cause the symptoms if I jump on it.
Dec 30, 2011 at 8:32 AM
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KHLOW2008
  • Experienced Mechanic
  • 41,814 POSTS
Seems the idle control system is causing the problem. Check the IAC and coolant level. Ensure IAC coolant hoses are not clogged.
Dec 30, 2011 at 12:17 PM
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