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Old 10-11-2012, 09:31 PM
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DPP528 DPP528 is offline
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Location: Westchester NY and Boston MA
Join Date: Oct 2012
Posts: 164
Mein Auto: 2000 528i Sport Prem 5Spd
If the Idle is surges when it's cold out it's likely that the Idle Control Valve is dirty. I replaced mine ($140 part) and it's much smoother now. I overhauled my Vanos seals thinking that they were causing the problem and although it helped performance, the problem continued until I swapped for a new ICV. Very common problem with the M52.

Last edited by DPP528; 10-11-2012 at 09:32 PM.
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