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In Reply to: Same condition, only '95 540i posted by Dave on March 05, 2001 at 09:49:37:
Once warm it won't do it, plus I also have noticed higher idle revs since new guibo and O2 sensors. (used to be 600 now more like 800)
Maybe it is the center bearing, for now giving it 3 minutes to warm up in the morning (even in AZ weather) has been keeping it quiet.
E-mail me if you solve the mystery
Jeff