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      03-02-2013, 08:10 PM   #2
Second Lieutenant

Drives: 328xi
Join Date: Mar 2012
Location: bay area

iTrader: (3)

Not sure how the intake duct connection to the intake filter housing should be:

The intake duct has two notches (dots are empty spaces):

The intake filter housing has two holes, should go over the notches:

this is the lip

But the intake filter housing connection has a lip, and some space in between... Should the lip be outside, i.e. below the intake duct? Or should it be inside the intake duct?

When I put the lip outside, the connection seems very loose. When the lip is inside, it's tighter.

Judging from that, I think the lip was inside before - an indy shop replaced my air filter last year and might have connected it wrongly. Which way should it be, and could an air leak cause rough idle in R?