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Re: Cruise Control (Correction/Retraction)
Last Thursday, 12/2/99, at 38 minutes past midnight EST, I posted the cruise
control vacuum system test below. I was utterly and completely wrong. It
will not work. I apologize for any confusion that any other negative effects
my statement had.
As an explanation, I had it backwards: by sqeezing the servo with the air
hose off and covering the hole, you can test the servo's air-tightedness.
You can thank Mr. Bucholz for catching the invalidity of my statement.
----- Original Message -----
From: Ryan Gemmill <email@example.com>
Sent: Thursday, December 02, 1999 12:38 PM
Subject: Re: Cruise Control
> I've had many a vacuum problem in my 86 5ks. Never an electrical one.
> From my experience, testing the vacuum system is simple. I've always
> disconnected the vacuum line at the servo, squeezed the servo to let all
> air out and create a vacuum, then reattatched the line. The system should
> hold that pressure, and the servo should stay squeezed. If it does: you've
> got an electrical problem. If it doesn't: you've got a vacuum problem.
> I even squeezed and let go of the servo to create the air-leakage noise
> which led me right to the leak. Of course, I was lucky and it was within
> In any case good luck, and if you find anything unusual let me know so I
> check it next time mine goes.
> Ryan Gemmill
> >From: Huw Powell <firstname.lastname@example.org>
> >Reply-To: email@example.com
> >To: Sitzman <firstname.lastname@example.org>
> >CC: Audi Fans <email@example.com>
> >Subject: Re: Cruise Control
> >Date: Thu, 02 Dec 1999 07:09:29 -0500
> > > Hey there.. thanks for the reply.. I hate to sound ignorant, but im
> > > exactly sure which vacuum hose you are referring to (as I am not sure
> > > you mean by the pump <i gather from reading the archives there is some
> > > sort of pump that creates the vacuum for the system>.. but where is
> > > pump? :)
> >Pump: usually near the port end of the firewall, has a 2" round
> >cylinder, small rectangular section, mounted with three rubber
> >standoffs. Electrical connector with rubber cover that has three 1/4"
> >spade terminals in it. A couple of hoses connections, one is used (the
> >other vents I think)
> >The hose comes out to a Tee, one end goes to the "servo", a little
> >bellows whose rubber side is connected by a short rod to your throttle
> >linkages (the parts that move when you push the gas pedal). the piece
> >of hose goes through the firewall and connects to both pedal switches
> >(unless automatic trans...)
> >There is a moderately useful block diagram of the cruise system at the
> >url below.
> >Huw Powell
> >and if you go to
> >in the top picture, the servo is pretty much dead center, just above the
> >orange dip stick, in the bottom photo it is in the left foreground.
> >There aren't any accidental good pictures of the pump on my car because
> >unlike hyd. clutch cars it is hidden under the sheet metal.
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