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Old 12-12-2012, 12:36 PM   #4
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Join Date: Dec 2012
Location: Germany
Posts: 128
My Ride: 323i
Originally Posted by E46tknv View Post
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.
If it is the same noise I have it is not the SAP, it starts when the key is turned to the on position without the engine running. It comes from the opposite side of the engine as the SAP as well.
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