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6 Series DIY
6 Series Do It Yourself (DIY) forum.

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Old 01-08-2014, 10:22 PM
Skarv Skarv is offline
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Location: Silicon Valley
Join Date: Oct 2010
Posts: 135
Mein Auto: '05 645i convert
Simple Vacuum Leak Fix

I'm starting a thread for this just because vacuum leak threads are all over the place and I wanted this one to help all of them.

So I've had a bit of the rough idle when warm problem, and I went on a CCV and Vacuum leak hunt this afternoon.

CCV's were perfect so I took off the intake to look inside the throttle body to see if there was any oil in there that would suggest a vacuum problem elsewhere. (it was dry... whew) but I did find a leak. Stupid leak that everyone should check for if they are having issues.

Turns ou the main air duct from the filter box & MAF to the throttle body is held on by two 4" diameter hose clamps. Very nice BMW ones. The air duct has a groove in it to receive these but what the previous mechanic hadn't noticed was that there are little pockets in the rubber duct for the screw mechanisms.

If you don't orient the clamps properly, you create a small gap where air can creep by. Especially if they didn't tighten these hard.

Anyway, seems to have cured my problem. Hopefully all problems would be as easy. Not likely, but I thought I'd share in case it saves someone some time gremlin hunting.

(Sorry for the duplicate... wouldn't let me delete the other one)
Old 01-13-2014, 01:14 PM
slemmer slemmer is offline
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Location: mississauga
Join Date: Jul 2003
Posts: 42
Mein Auto: '04 645cic '00 740i Sport
Interesting find. I've been searching on and off to find my vac leak so I'm going to resort to smoking it to see once and for all as I've pretty well changed all the piping that I can think off. It's such a nuisance too.

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