my 94 crown vic keeps making a loud humming noise causing the idle to pick up while I'm braking then when I make a stop it stalls out...what could this be

Asked by Kyle Apr 13, 2014 at 11:29 AM about the 1994 Ford Crown Victoria 4 Dr LX Sedan

Question type: Maintenance & Repair

1 Answer
58,575

Tracy answered 10 years ago

A few things come to mind but the first possibility is the IAC (Idle Air Control) valve. It's on the side of the Throttle Body, held in place by 2 small bolts. It's either gunked-up or failing. Typically, to address a poor Idle quality, I clean the Throttle body and the IAC, and disconnect the Battery for a few minutes. The Second thing that comes to mind is an un-metered air leak (vacuum leak). Check all tubes and vacuum connections.

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