Re: Cruise Control

["Ryan Gemmill" <rglist00@hotmail.com>]

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 the 
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. Once, 
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 
earshot.

In any case good luck, and if you find anything unusual let me know so I can 
check it next time mine goes.

HTH

Ryan Gemmill


>From: Huw Powell <audi@mediaone.net>
>Reply-To: one@humanspeakers.com
>To: Sitzman <bg20300@binghamton.edu>
>CC: Audi Fans <quattro@audifans.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 not
> > exactly sure which vacuum hose you are referring to (as I am not sure 
>what
> > 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 this
> > 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
>
>http://www.humanspeakers.com/audi/cruise-diagram.htm
>
>and if you go to
>
>http://www.humanspeakers.com/audi/engine.htm
>
>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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