Idle problems, 80, gotta be a Vacuum leak

["Alexander van Gerbig" <Audi_80@email.msn.com>]

    I did the bubble test again today with some soapy water in a windex
bottle and saw no bubbles around the injectors, so injectors seals are fine.
I checked the suspect hose and it's fine.  I have never loosened a hose
clamp while the engine was running before today, and when I did lossen a
clamp I got an earful of wooooosh.  That is the exact same noise I hear
coming from the rear section of the engine always.  I am now assuming it's
time to remove all the lower hoses again and check.  There is a small vacuum
hose that is connected to the last injector for the carbon canister system.
I have never removed that hose and maybe that's the one.
    I know it is a vacuum leak for sure now.  I just can't pinpoint what
hose it is.  I soaked a rag in carb cleaner and stuffed it in suspect places
to see if the idle would fluctuate, nothing.  I told my mechanic I would
like him to check the work he did 9 months ago with the ISV and Air flow
meter, but maybe it's as simple as a vacuum leak.  What is the best way once
I have a hose out to check for a leak?  I take the hose and bend it to look
for cracks, then plug one end and blow.  Maybe just replace all the hoses!

Thanks!

Alexander van Gerbig
'88 Audi 80 -- Koni Yellows, G&M Springs, Borbet Type T, Dunlop SP9000
HÖR Technologies Sport Hydro Cam, K&N Filter

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