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Old 04-19-2012, 03:22 PM
Supercourse Supercourse is offline
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Location: British Columbia, Canada
Join Date: Feb 2008
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Mein Auto: 2004 X3 2.5i
Originally Posted by x3bimmerkit View Post
.... the only time i hear the noise is when the car is in motion and the rpm's reach between 1800-2000..
Then that would rule out a pulley, tensioner, vacuum leak and quite a few other engine components.

Most likely driveline related. Transmissions can make a high-pitched whistle noise in a specific speed band, whereas diffs., transfer cases are more likely to make a lower-pitched whine or hum.
Try driving in manual mode and see if it really is rpm related or in fact mph related.
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