1999 Honda Civic engine running rough

Tiny
CHANGTE
  • 1999 HONDA CIVIC
  • 1.6L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES

This Honda civic runs ok, but suddenly the idle is higher and down higher and down.
I turn the aircon on, then it is normal. Runs for a while, the idle is up and down again.
which part should cause the problem?

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Friday, July 4th, 2014 AT 7:45 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
  • 68,370 POSTS

Most common problem to cause this issue is the idle air control valve (IAC). The IAC is responsible for maintaining the engine idle speed.

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Friday, July 4th, 2014 AT 9:54 PM

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