Noises problem
2002 BMW 330 6 cyl Two Wheel Drive Automatic 92000 miles
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There is a whistling sound when the accelerator is pressed and the speed levels out. If you let off of the accelerator a little the sound stops until the pedal is pressed in a little. It sounds like it is coming from one of the belts or one of the pulleys, but I can’t tell.

If the noise is from the under hood area, the deflection pulley is often the cause. Part# 11-28-1-748-130