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Old 11-16-2012, 05:20 PM
UltimateDriving UltimateDriving is offline
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Join Date: Oct 2007
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Mein Auto: A Car
Could be the Crankcase ventilation valve that is failing.
I have an E39 with the same M54 engine that was having problems with cold starts, sometimes it would need 2 or 3 tries and when it worked i had rough idling but after it warmed up it was good for the whole day until next morning . . . the same thing happened every morning cold start. Replaced it and now cars works perfectly.
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