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Old 12-10-2010, 02:51 PM   #11
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Join Date: Apr 2008
Location: Boston
Posts: 4,971
My Ride: 2003 325xi
Originally Posted by E-rock View Post
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.
Nah, it's the DISA.
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