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Old 12-10-2010, 08:43 AM   #10
E-rock
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Join Date: Aug 2009
Location: Philly
Posts: 310
My Ride: '01 330xi
Quote:
Originally Posted by mp333 View Post
Try disconnecting the DISA, see if there's any change. Also is the ICV clean?
I've never known or experienced a dirty ICV to cause the rise and fall the OP described. Rough idle, yes, but not a rhythmic, surging idle. Couldn't hurt to clean the ICV if it hasn't been done in the past year or two but my guess is a temp sensor has gone bad, or worse, coolant isn't coming into contact with the sensor.
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