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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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Old 10-30-2009, 10:57 PM
Rezagsaeedi Rezagsaeedi is offline
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Location: Toronto
Join Date: Oct 2009
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Mein Auto: BMW X3 2.5i
Loud Noise

After cold weather i have a loud noise in right/front side when i drive in the morning for 5 minutes and then it goes away and if i park i for long time it would start again. It doesn't happand when car is in stop, it happend when car start to move.
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Old 10-30-2009, 11:19 PM
Supercourse Supercourse is offline
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Location: British Columbia, Canada
Join Date: Feb 2008
Posts: 3,891
Mein Auto: 2004 X3 2.5i
Could be the secondary air pump, located in line with the windshield washer tank on that side.

It is only doing something for a short while after a cold start (pre-warming the cat), and can get noisy when it has some internal degradation.

Usually more of a bang just after starting, but your symptoms could fit as well.
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