High pitch whine from top of engine on 2001 BMW 325xi

High pitch whine from top driver side of engine that goes up or down with the throttle of the engine. No service engine soon light on or other warning lights are on. Otherwise car runs fine. What is the cause of this noise?

by in Bethlehem, PA on January 15, 2011
2 answers
ANSWER by on January 15, 2011
Could be a VANOS unit, belt tensioner pulley, power steering pump, small air intake leak. It's not easy to diagnose a noise through the internet. The best thing would be to diagnose it with a stethoscope to pinpoint the exact location. Zee
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ANSWER by on October 29, 2012
Sounds like a leak in the intake manifold or throttle body, maybe...

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