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#1 (permalink) Old 09-29-2008, 08:51 PM
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rough running

I am having a problem that comes and goes, usually when i am doing some spirited driving. Car will be running great, then it feels and sounds like it is running on 3-4 cylinders and the check engine light comes on. After a few minutes it starts to run fine again. Car is a 99 M3 auto.
Any ideas?

Diana cold air intake, stage 2 software, cat back.
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#2 (permalink) Old 09-30-2008, 07:21 AM
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Could be a camshaft sensor on its way out, when was the last time it was serviced ?, also could be your fuel filter has crap in it.

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#3 (permalink) Old 09-30-2008, 09:49 PM
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I have owned it for 3 yrs and I have never serviced the sensor. wouldn't that make it run rough all the time?

Diana cold air intake, stage 2 software, cat back.
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