Quote:
Originally Posted by irokwrx
Hey not sure if you still have this issue but I had this issue for about a year. ONLY on cold starts. What fixed it was replacing the brake pump behind the driver-side finder. Super simple replacement. I did a small write-up on "What have you done to your M3 today". If anyone else is having this issue give this a go. BTW I replace every fuel and spark item in my car trying to fix this and the pump did the trick.
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Wow I never heard of the brake pump fixing it. Does it leak down the vacuum after sitting a while? What’s it doing to cause long cold starts ?