2004 Ford Expedition whining sound

2004 FORD EXPEDITION
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LACVIEUXPHARM
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Noises problem
2004 Ford Expedition Four Wheel Drive Automatic 98,000 miles

help! I have been noticing lately that whenever I step on the gas pedal I hear a high pitched whine. If I let off the gas the noise goes away. any idea what it could be?
Aug 20, 2010 at 10:22 AM
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MERLIN2021
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Things to check: Pulleys, tensioner idler, alternator, and A/C, remove the serpentine belt, spin the pulleys by hand, any roughness or binding means replace! The other problem makes more of a honking than a whine, but if the air duct from the filter to the throttle body has a crack, strange sounds will be heard, Ford also notes that the IAC(idle air control)valve can produce honking if it needs replacing. Does it do it in park as well as driving?
Aug 20, 2010 at 10:53 AM