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Old 12-10-2010, 02:55 PM   #13
nickchuck
Registered User
 
Join Date: Dec 2008
Location: Central Jerz
Posts: 140
My Ride: 325xi (Topaz)
Probably the DISA Valve. http://www.ecstuning.com/Search/11617544806/ES25794/ You can disconnect this on your own very easilly. If it flaps open and closed (no spring tension) it's broken.

If not check the coding of your computer. I had mine updated with the newest software ($129 at the dealer) and all my idling issues dissapeared. This may be a good idea if you haven't done it recently anyway.
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