2002 Mercury Grand Marquis Q&A

2002 Mercury Grand Marquis Question: idle speed control

2002 mercury grand marquis idle speed control making a moaning sound. -
Answer 1
Idle air control valves on Fords sometimes fail in a way that make them hum or moan. While the car is making the noise you are talking about, place your hand on the air filter housing. If you feel a vibration relative to the noise, then the idle air control valve has failed. -
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...e at idle dies when put in gear when cold till warmed up no vacuum leaks have already replaced idle speed control valve no check engine light is on no codes at engine diagonstics