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Old 12-08-2012, 02:32 PM
rgk330i's Avatar
rgk330i rgk330i is offline
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Location: Fairfax, VA
 
Join Date: May 2002
Posts: 247
Mein Auto: 2013 335i M-Sport
Before you wrap everything up, check the very back of your intake manifold against the firewall. You should find one (or maybe two) rubber plugs that seal off vacuum nipples on the manifold. They're probably brittle and might be cracking. Replace 'em while you're in there.

See this diagram on realoem.com, part numbers 17 and/or 15.
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2013 335i M-Sport, ED May 2013
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