Quote:
Originally Posted by chilledn52
Shot in the dark here: pcv hose connecting from valve cover to oil separator possibly leaking and or internal crack in one of the pcv hoses?
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I was about to say this. I had intermittent rough idle with my 330i that started randomly occurring, but would smooth out quickly. Eventually the SES light was triggered. I cleared the code and the same behavior continued. I rigged up a smoke tester and found the hose from the manifold to the oil separator was leaking.