1995 Honda Civic Engine idle

1995 HONDA CIVIC
201,000 MILES • 4 CYL • FWD • MANUAL
Avatar
MWOLFINGTON
  • MEMBER
  • 1 POST
While idling, the engine will rev-up and drop back to the normal idle speed continuously.
Dec 30, 2009 at 11:39 AM
Advertisement
Avatar
MERLIN2021
  • CAR REPAIR CONTRIBUTOR
  • 17,250 POSTS
Get a can of spray Throttle body cleaner, start the car and spray around, pay attention to vacuum lines and manifold, if the idle changes, you found a leak. You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!

The other possibilty is the idle air control, it,s bolted to the side of the throttle body...
Dec 30, 2009 at 5:28 PM
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.