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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 12-03-2012, 03:11 PM
1972ford's Avatar
1972ford 1972ford is offline
Function over fashion
Location: NH
Join Date: Jun 2009
Posts: 886
Mein Auto: 325xiT
Clever way to check for vacuum leaks?

I've been chasing an idle surge problem for a few weeks now, although it's hardly been a priority. It's gotten cold out here in NH and I feel like it is related to the temp, but can't say for certain. The car starts normally and idles perfectly cold, then after a short drive e.g. to work, when I clutch in the idle fluctuates from 500 to 1000 and back about 8 to 10 times and then settles down to 700ish, and stays there.

I have cleaned the DISA valve and ICV and replaced both intake boots. The ICV in particular was quite dirty, and the lower intake boot was definitely cracked, but the problem is more or less exactly the same.

My research has pointed me to look for vacuum leaks, but other than visual inspection of the hoses I can see, any thoughts about how else to pinpoint a possible leak?

Thanks in advance.
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