Engine is revving when idle

HONDA PASSPORT
Avatar
HONDAPASSPORT
  • MEMBER
  • 1 POST
My 97 Honda Passport is revving at about 3000 rpms when idle. It is an automatic transmission. It won't do this every time. It is kind of random. It will also rev up when I am slowing down, it seems like in between downshifts. I recently put in some fuel system cleaner. Would this cause any problems or would it be a transmission problem?
Mar 25, 2007 at 10:05 AM
Advertisement
Avatar
BRUCE HUNT
  • ✓ASE Certified Mechanic
  • 3,754 POSTS
  • ASE Certified Mechanic
Kind of a surging up and down of the engine speed?

Vacuum leak at tubing, leak in the intake manifold or intake manifold gasket, air in the cooling system, or a dirty air idle control valve are some of the possible causes.
Mar 26, 2007 at 10:33 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.