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Old 12-16-2012, 07:53 AM   #418
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 22,993
My Ride: 330CiC, M5, X5, E93
VANOS seals may play into this a bit and this is mentioned in the very first post, however, I personally believe that VANOS seals are more of an issue above 2000-2500 RPM. What I think happens is people replace the valve cover gasket and possibly the CCV and the broken SAP vacuum hose when replacing the VANOS seals and their cold start issues are resolved, not due to the VANOS seal, but do to the ancillary vacuum leaks that are either purposefully corrected or corrected due to the valve cover replacement.

I would bet that 95+% of the cold start issues can be resolved without VANOS seal replacement.
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