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      12-06-2012, 04:01 PM   #7
335BBS
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Canada
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Drives: 2009 335 coupe.
Join Date: Jan 2010
Location: Toronto, Ontario

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Quote:
Originally Posted by jwalker87 View Post
I had a similar problem and JUST finally fixed it, though yours is probably different. I had the same problem as you, and cleaning my intake valves (did it DIY style) fixed it. But then it came back a month later! Replaced spark plugs and coils, no effect. Then went to replace the injectors, and one of them was damaged! Part of the mounting tab (a small piece of metal welded to the side of the injector) was broken off, causing it to come unseated under pressure, I assume. I'm not sure how cleaning my intake valves fixed it temporarily, but that was the root problem.

In summary, clean your intake valves (DIY or pay someone $700), and look at ignition/injection components for that shake. Also, take it to AutoZone (or similar) and they will pull the codes for free. That will help diagnose.
How do you do this yourself?
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