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Moderator
Join Date: Feb 2004
Location: DFW (Hurst), Texas
Posts: 4,730
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I initial guess is Idle Control Valve which can make a buzzing noise, but I think it is under the intake on your car and you shouldn't be able to see it easily.
Its #6 here:
http://www.realoem.com/bmw/showparts.do?model=HD53&mospid=47404&btnr=13_0381&hg=13&fg=15
See if you can the part in those diagrams.
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