E46Fanatics - View Single Post - Deviation rich (both banks), rough idle
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Old 11-13-2012, 09:13 PM   #7
OEM ///Member
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 23,184
My Ride: 330CiC, M5, X5, E93
You would be surprised!!!

Also you can have oil leaking and not a bad air leak and you can have a bad air leak with no oil leaking!

Cracked valve covers are also another very common issue as well.

Do not discount the valve cover. A valve cover leak will likely not respond to a brake cleaner test very well, however, if you smoke test the crankcase you will find the valve cover leak quickly.
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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