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Old 06-06-2004, 10:59 PM
Ron Stygar's Avatar
Ron Stygar Ron Stygar is offline
19,585 Miles
Location: CT
Join Date: Mar 2002
Posts: 11,141
Mein Auto: Z4 M Coupe 6LL93033
Originally Posted by eVal
On my 02 I notice that there is a deep humming noise upon start up that will last a minute or two. I thought it was especially evident when the engine is cold, but now that I reflect on it I'm thinking it comes up regardless.

Its not me or the passenger humming, so does anyone have an idea what this sound is, if its normal or something to look into?
Secondary air pump? Back of the engine compartment on the passenger side. Runs on cold start for up to 90 seconds.
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