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Q: idle speed control on 2002 Mercury Grand Marquis

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2002 mercury grand marquis idle speed control making a moaning sound.
(1) Answer
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.