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Old 11-13-2012, 08:35 PM   #6
thefrog1394
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Join Date: Jul 2009
Location: Columbus, Ohio
Posts: 965
My Ride: e46- 1999 323i
Quote:
Originally Posted by jfoj View Post
Smoke test, spray brake cleaner, mechanics stethoscope with the transducer removed and extending the hose to listen for vacuum leaks.

But except for crack valve cover or bad valve cover and a few other odd things a visual inspection is really the best solution. You WILL find problems visually inspecting the obvious culprits and you will likely find other problems as well.
Valve cover gasket is indeed bad and leaking, but I would be very surprised if this could let enough air in to set off adaptation errors and cause a noticeable idle drop. My valve cover gasket was leaking way worse and the SAP vacuum line was cracked really bad on my other e46 and no CEL and perfect idle...
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1999 323i - 210,000 miles and counting.
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