Quote:
Originally Posted by F20_M135i
Your exhaust valve is closed during a cold start, and this is not what makes the sound volume higher (no back pressure either)
It is an increase in speed and air injection so that your catalyst heats up faster that occurs, according to anti-pollution standards.
So the only way to avoid the "BMW cold start" is to encode the DME.
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It wouldn't be so bad if it only did it on an actual cold start, but it does it on every single start hot or cold AFAIK.