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Old 07-27-2010, 07:42 AM   #39
58mm of Bliss
PEI330Ci's Avatar
Join Date: Jul 2003
Location: PEI,Canada
Posts: 4,369
My Ride: 330i, 330Ci
Originally Posted by McSpeed View Post
didn't I hear that dip was from the DISA aka idle control valve flap action? If you haven't yet you could try unplugging it during a dyno run and see if things smooth out. flattens things out alright, just not in a good way.

Disa=resonance flap
Iacv=idle air control valve

*sent from my iTool
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