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Old 01-06-2013, 02:18 PM
pcy pcy is offline
Officially Welcomed to the 'Fest
Location: Boston
 
Join Date: Sep 2011
Posts: 1,307
Mein Auto: '06 530i, '07 C280, ML320
Since you said the problem started after the alternator was replaced and new belt was installed, are you absolutely sure the alternator pulley (on the new alternator) is correct one and in perfect condition? Also, where did you buy the belt?
Check the condition of the belt tensioner; you may want to replace the tensioner and the idler pulley(s). Not sure how many idler pulleys your engine has. N52 (on my car) has 2 idler pullies.
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