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Old 09-21-2011, 11:06 PM   #2
Registered User
Join Date: Feb 2011
Location: The center part of Florida with no ocean.
Posts: 710
My Ride: 330i w/out park.
Secondary air injection pump perhaps? It will make a small whistle noise-that is normal. I'm presuming after 208k you know what is normal vs. not normal though.

That pump could very well be on its way out though, listen to that and see if the noise goes away when it shuts off.
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