How to find vacuum leaks

[S. Jaworski]

I have a 90 100q which stalls when removing oil cap.
I have a 88 5kq which idles with no changes when oil cap is removed.
Both cars are non-turbo.
What exactly was "adjusted" to compensate for additional air?
Incidently, I changed all the rubber vacuum lines and rubber gizmos around
the ISV valve. It still idles with no change when oil cap is removed.
I pinched off the vacuum line that goes to Climate control and diff locks .
. .. still the same.
Is there some other vacuum leak source that I have missed?
I'm ready with the propane tank Huw . . .just tell me where to point the
hose.

Syl
88 5kq
90 100q

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Message: 10
Date: Sat, 04 Aug 2001 18:29:00 -0400
From: Huw Powell <audi at mediaone.net>
Reply-To: one at humanspeakers.com
Organization: HUMAN Speakers
To: quattro at audifans.com
CC: Larry C Leung <l.leung at juno.com>
Subject: Re: How to find vacuum leaks


> Correct me if I'm wrong but isn't the stalling directly related to the
> removal of the oil cap or dipstick? In other words, isn't THAT your vacuum
> leak?

Rob is correct, you have it backwards.  engine runs fine capped, stalls
when uncapped, tends to indicate *no* vacuum leak.

If it didn't stall (and this is trueer of turbo's than NA, btw), then
its already been adjusted to compensate for excess air and the
cap/dipstick test *does not* stall it since its not enough extra
unmetered air to lean it out to the point of stalling...
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