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odd sound when engine starts up



Hi-
I have a 100% stock 97 M3 coupe.  I hear what sounds like a pump or small 
motor running for about 2 or 3 minutes when I start the engine after the 
car has been sitting over night.  The sound stops and then the car runs 
fine.  What is making this sound?  Is it an engine oil pump of some 
kind?  I'm just curious... not concerned about it.  I have no reason to 
think that something is wrong with the car.
Thanks,

Kevin
kevingregg@domain.elided     http://members.home.net/kevingregg
1997 BMW M3 Estoril Blue coupe http://members.home.net/kevingregg/m3/
Columbia, MD

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