Mechanics

ENGINE RUNNING ROUGH

1999 Honda Civic • 1.6L 4 cylinder 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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Changte
July 4, 2014.




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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