My car started running rough then it cuts off, started back n kept cutting off, had it towed to the shop and the codes they got were all coils were misfiring and 4 o2 sensor codes,

Hal Brown

Asked by Sep 16, 2016 at 11:28 AM about the 2002 BMW 3 Series 325Ci

Question type: Maintenance & Repair

replaced all the coils and the problem was still there, there was also 4 O2
sensor codes, and the car also was giving off a big puff of white smoke, then it
would go away. We also realized that if we un plug the air flow meter it runs
better, we tried a new aif flow meter in it and it ran the same, any ideas?

2 Answers

Up Front

Sounds like you have a tear in the big rubber boot that connects the mass air flow to the throttle body or other vacuum leak. You could stray carb and choke cleaner around the areas of this boot and other vacuum lines while car is running. It this changes the was it runs the find vacuum leak and repair it


Maybe a clogged air filter.

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