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|3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.|
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Originally Posted by drz
The most common fix is to clean out the ICV.
The following is a paraphrase of Bavautos' recommendation for the same problem on an e30 (I don't know how much is similar or different):
An idle that countinuously goes up and down is tipically due to eaither a lean fuel mixture or a faulty idle control system. A lean mixture can be caused by a number of things; once is a vacuum leak. Check your engine's rubber intake boot for cracks or tears, and inspect all of the air and vacuum lines. If you find no vacuum leaks, clean out the idle control valve (ICV). If that does not fix it, you may have to replace the idle control module (in the glove box, I believe).
Clogged injectors, the cold-start valve or the thermo-time switch can also cause this problem, but these are less liekly causes.
Originally Posted by zibby
What I ment by "tapping"on it is to recognize the problem ,then naturally you have to clean it
Originally Posted by shawnst
Thanks guys. If the ICV is the culprit, I guess the problem would happen all the time, right?
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