Thread: N52 Low Idle?
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      12-02-2012, 10:56 PM   #5
Volasko
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Drives: 2006 E90 330i BSM 6MT ZSP
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I would check the vanos solenoids. See this DIY for more info:
http://www.e90post.com/forums/showth...ighlight=Vanos

He is physically replacing the solenoid but all you need to do it pull them out, clean them with some MAF cleaner and then hit them with some compressed air. I would switch the exhaust and the intake also to help extend the life of them. They commonly get clogged which can give you the symptoms you see above.