View Single Post
Old 12-10-2010, 09:43 AM   #10
Registered User
Join Date: Aug 2009
Location: Philly
Posts: 310
My Ride: '01 330xi
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.

"So when you go for a drive, remember to leave your murderous anger where it belongs - at home."
E-rock is offline   Reply With Quote