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      12-06-2012, 12:15 PM   #3
Sparky68
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Drives: e90 335i JB4
Join Date: Oct 2012
Location: Cambs

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2007 BMW 335i  [0.00]
Quote:
Originally Posted by Nigelo View Post
Could also be the exhaust flapper - on a cold start the extra exhaust gas can sometimes set it wagging.
Makes sense, it is quite a loud noise. Mine has been unplugged from the vacuum so the more i think about it, the more likely you are correct.
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