Thread: Sound at idle?
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      07-20-2011, 12:59 AM   #21
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Drives: E92 M3
Join Date: Jun 2011
Location: USA

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This might sound obvious, but the air conditioning makes a pretty crazy sound on cold starts. Is this when your car is warmed up or when you start it? Try turning the climate control off when you start the car. See if that's what it is...

There are many other posts (even a sticky) about the M3s unique sounds. Maybe check it out to see if you see something similar
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