my 540i is running rough,shifting rough,exhaust white smoke,and smells like fuel mixture is too rich
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1997 BMW 540i Question: rough running bmw 540i
Answer #1ZeeTech November 30, 2010, 07:34Master
You really need to get it diagnosed by a BMW specialty shop to see what causing the problems. They should be able to pull out diagnostic trouble codes from the affected modules and be able to estimate the parts and repair cost for you.
autoeuro December 02, 2010, 01:34Rookie
PCV valve on back of intake manifold. common fault. diagnostic codes won't show for this fault and unless techi knows these cars he won't know what the problem is,