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Discussion Starter · #1 ·
I've read all the threads on rough idle and none really match my problem. So my '05 330i ZHP suffers from bad hair... I mean idle days. On about 50% of days, the idle is slightly rough and the engine sounds louder. On the other half of the days, the idle is dead flat and the engine sounds smoother. On bad days, the idle isn't rough enough to make the needle jump all over the place but the needle will quiver and it doesn't go away after the engine is warm. Any ideas?

I'd like to catch this problem before it gets worst and causes more damage. The BMW dealer says there isn't a problem.
 
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