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      12-03-2012, 04:08 PM   #4
michaeldch
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Drives: 2007 335Xi
Join Date: Apr 2011
Location: Kenmore, WA

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Quote:
Originally Posted by michaeldch View Post
... replace the 4 'routine maintenance' parts (belt, tensioner, both deflection pulleys) and see if the issue is resolved....
This resolved the issue entirely - engine sounds so much smoother.
Total cost was ~$280 for the parts and shipping and it took about 2 hours for removal and reinstallation.
Hope this helps someone else... my 335xi now has 50k miles.
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2007 E90 335xi
Cobb AccessPort, BMW Performance Exhaust