engine is revving on its own

105,000 MILES
Avatar
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
Advertisement
Avatar
KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 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
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle