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Old 10-19-2012, 07:29 PM   #3
fastjasonbmw
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Join Date: Sep 2011
Location: CO
Posts: 244
My Ride: 330Xi
Perhaps vanos seals...if the symptoms go away after the engine has reached operating temperature.
http://www.beisansystems.com/

On the other hand its pretty difficult to diagnose a vibration/hesitation without feeling it.
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