Thread: Vibration ?????
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Unread 03-02-2012, 12:59 AM   #5

Name: Manolito
Title: Member
Status: Offline
Join Date: May 2006
Location: Sacramento
Rate My Car: 339 / 340
Your Ride: (2) '97 328s; '04 330; '04 325iT
An unusual growl when the hood is up can also be a failed check valve on the exhaust manifold.

Be sure to check that before it destroys your secondary air fan. Just disconnect the hose between the check valve and the fan and see if exhaust leaks up the hose when the car is running.
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