Why is My Exhaust Butterfly Valve Permanently Open! BMW E90
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10-07-2010, 09:55 PM
Drives: 2003.5 BMW M3
Join Date: Dec 2007
2 things that may be simple but might have been overlooked
1) is the rubber vacuum line connected?
2) there is a connector in the trunk behind the driver side rear taillamp. if its disconnected, the butterfly valve remains open.
2014 Porsche Cayman S
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