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
Sypmtom is known as surging and this is due to excessive high idle.
Possible causes are:
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.