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2008 BMW 335xi backfires


My 2008 BMW 335xi backfires when it is cold. There appears to be nothing else wrong with the car and the dealer’s service department has told me on various visits: we can’t reproduce it; or it is “normal”; it’s a turbo and runs rich so typical; or this other new BMW on the lot does the same thing so it’s expected. The backfire only happens when the engine is cold, but EVERY time it is cold. I just had the exhaust replaced because the backfire damaged it. The service department is sick of seeing me and does not have an answer. My car is still under warranty.