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Re: Vacuum hose question
In message <firstname.lastname@example.org> Dan Murphy writes:
> Hey all, I think my problem with my 85 cgt is the vacuum. I'm not
> getting any at some places and all the hoses look real bad. I'm
> planning on just buying some hose and replacing all the vacuum hoses I
> can. But i went to Champion Auto parts today and they said I had to
> know what size the hose is. I have no idea what size it is. So, does
> anyone know what size it is? Or where I can get like 10 feet or so of
> vacuum hose? Thanks.
It's nominally 3.5mm ID. I use Gates 3225 4mm multi-fuel hose, secured
with proper hose clips. Costs pennies a foot, compared with AUDI's
quite frightening price.
Most common vacuum problem I find on those cars is a ruptured vacuum
advance diaphragm. Second most common is the hose chafing through where
it sits on a wiring bundle at the back of the head.
I'd guess about one in three of the cars of this age I see has a vacuum
fault. The MityVac is one of the first things I use on most of the
engines I see.
My Passat had a faulty vacuum advance system for eight years. Just after
John Robinson sold it to me, I did the MityVac test and it failed. So I
debugged it and found the bad diaphragm. Naturally, once the leak was
stopped, all of the other vacuum operated bits started working again,
including the upshift indicator. I asked John when it had stopped
working, and he said: "What upshift indicator?"
There's a distinct possibility (he had the car from 8000 miles) that it was
bad from the factory.
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