PCV valve - whistling noise after engine turned off I have a 2002 Ford Explorer and had been experiencing a "whining, whistling" type sound for 3-5 seconds after turning off my engine. It came from the drivers side, by the firewall, around the manifold and master cylinder.
The IAC valve assembly controls the engine idle speed and provides a dashpot function. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC I didn't think the 2005-2009 GT's have IAT valves. The throttle-by-wire system regulates the Idle. :headscratch
The idle air control (IAC) valve is a crucial engine management component and it will be connected to the throttle body and managed by the ECU (engine control unit). Like all other engine parts, it is not fail-proof, and so at some point, it can start developing issues and hence affecting the performance of...