1991 Chevy Caprice idles up on occasions

1991 CHEVROLET CAPRICE
150,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
CARIDLE
  • MEMBER
  • 1 POST
The idle goes up on occasions while driving. The cars distributor, plugs, rotor have been changed. The service engine light goes on when the car idles up but goes off when the idle returns to normal. The idle goes up for a minute or so then returns to normal while driving. I did try higher octane and fuel injector cleaner.

Thanks for any help you can give.
Sep 28, 2009 at 8:21 PM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Check engine light being On it means you have a intermittent problem within the engine management system you need to pull the code/s from the computer to find out what's causing it.

Could be that the idle air control valve needs cleaning out
Sep 29, 2009 at 12:39 AM
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.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.