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View Full Version : 525 I rough idle when first started


frost427
02-19-2009, 04:36 PM
I have a 1992 525I that runs a little rough when it first starts. Looking for what to check?

tanzi
02-24-2009, 09:31 AM
are you throwing any codes?

I would first clean the ICV. Its a very easy process.

http://forums.bimmerforums.com/forum/showthread.php?t=900798

Viking328
04-11-2009, 12:22 AM
All of my M50 engines eventually did that and each time it was just the black rubber boot from the air box to the throttle body or TB to manifold. Look for tears between the accordion flex areas. :thumbup: