Quote:
Originally Posted by DadzM3
The reason for number 1, or so I am told by a 30 year BMW tech is that M3 has no air pump, so the car runs extra lean at start up to heat the catalytic convertors quickly then goes back to normal after a minute or so.
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See part number 1 in link below. Says it's an air pump.
http://bmwfans.info/parts/catalog/E9...trol_air_pump/