1995 Honda Civic Engine idle

Tiny
MWOLFINGTON
  • MEMBER
  • 1995 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
  • 201,000 MILES
While idling, the engine will rev-up and drop back to the normal idle speed continuously.
Wednesday, December 30th, 2009 AT 11:39 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 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.
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Wednesday, December 30th, 2009 AT 5:28 PM

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