When the car is idle, the engine keep on.

Tiny
ANONYMOUS
  • 1994 HONDA ACCORD
  • 147,000 MILES

When the car is idle, the engine keep on getting loud and then normal but when driving is fine, what can the problem be?

Wednesday, November 28th, 2012 AT 2:23 AM

1 Reply

Tiny
KHLOW2008
  • EXPERT
  • 42,001 POSTS

Sypmtom is known as surging and this is due to excessive high idle.
Possible causes are:
Vacum leakages.
Lack of coolant.
Idling speed adjusted to high.
Faulty Idle Air Control (IAC) valve.
Cold start valve(fast idle thermo valve(FITV)).
Clogged coolant hoses to FITV and IAC.

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Wednesday, November 28th, 2012 AT 4:55 PM

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