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Old 12-12-2012, 11:20 AM   #3
zhenkaaaM3
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Join Date: Feb 2011
Location: New york
Posts: 5,841
My Ride: Fst'r then your e46
are you asking whats the sound coming from the engine for the first 30 seconds of startup when the car is cold?

If yes, its your secondary air pump doing its work.
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