Is the Cruise Control Servo/Regualtor Bad?

[Cade Carvell]

Hmm...sucking on the end of an almost twenty year old vaccum
system...Yuck...LOL
Thought of that, I may end up trying it out, today.

Thanks,


Cade Carvell
National Business Systems, Inc.
Eagan, MN 55121
Office: 651-994-4400

>>> Robert Myers <robert at s-cars.org> 09/11/02 10:44AM >>>
At 11:32 AM 9/11/02, you wrote:

>But, If I bypass the entire vaccum system, wouldn't that tell me if
the
>pump is bad?  Ie straight off the suction end should have descent
>suction correct?

You might think so but I'm not sure just what pressure this system runs

at.  If it operates at a low level vacuum (relative to ambient, not a
low
absolute pressure) then there might appear to have very little "suck"
while
still providing adequate vacuum for the system to function if there are
no
other leaks.

I'd still suggest checking the hoses before spending a lot of time and

money replacing parts.

Hey, how about this?  Try sucking with your mouth on the end of the
hose
where it attaches to the pump.  If the system is tight then it should
feel
more or less like sucking on a soda straw with your finger over the
other
end.  If you don't feel that resistance then you have a leak
somewhere.



>Thanks,
>
>
>Cade Carvell
>National Business Systems, Inc.
>Eagan, MN 55121
>Office: 651-994-4400
>
> >>> Robert Myers <robert at s-cars.org> 09/11/02 10:20AM >>>
>The usual cause for inoperative cruise control is a vacuum leak.
Take
>a
>look at the vacuum switches mounted above the brake and clutch
>pedals.  Look for broken/split/missing hoses.  Also, these same hoses
>extend into the engine compartment.  Check their condition there
also.
>
>Good luck - replacing a section of hose beats the living daylights
out
>of
>replacing anything else related to this system.
>
>At 10:53 AM 9/11/02, you wrote:
>
> >Hi,
> >   I am still getting the hang of Audi.  While I am waiting for my
> >manual to arrive, could some one tell me if what I did proves that
>the
> >Cruise control servo is bad.  The problem, is well, it doesn't
engage
>at
> >all.
> >   I unhooked the Cruise control servo/reg harness (three wire
>harness)
> >from the module.  I took a pair of 12V leads and touched the Top
and
>the
> >left pins.  This caused the motor to run.  I took the Vaccum lead
>from
> >the Cruise diagphram, and attached it directly to the port on the
>cruise
> >servo/reg.  So it was now stright from the port to the tube, to an
>open
> >end.
> >   While having the motor run, I noticed that I recieved no vaccum
on
> >the end of the hose.  It wouldn't even hold a piece of paper up ( a
> >small scrap).  I would then surmise that the vaccum pump is bad,
> >therefore needs to be replaced.
> >
> >   Is this correct, or does this pump run a lower then 12V current?
>Is
> >there some other test I should do, to make sure before replacing
that
> >this is really bad.
> >
> >Sorry for the long post, Just trying to make sure I get all the
>details
> >correct.
> >
> >1987 Audi Qauttro 4000, 62,000 miles
> >
> >Thanks,
> >
> >
> >
> >Cade Carvell
> >National Business Systems, Inc.
> >Eagan, MN 55121
> >Office: 651-994-4400
> >
> >
> >
> >
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>
>Bob
>*****
>   Robert L. Myers   304-574-2372
>   Rt. 4, Box 57,  Fayetteville, WV 25840 USA   WV tag Q SHIP
>   '95 urS6  Cashmere Grey - der Wunderwagen    ICQ 22170244
>   http://www.cob-net.org/church/pvcob.htm
>*****
>
>
>
>
>
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Bob
*****
  Robert L. Myers   304-574-2372
  Rt. 4, Box 57,  Fayetteville, WV 25840 USA   WV tag Q SHIP
  '95 urS6  Cashmere Grey - der Wunderwagen    ICQ 22170244
  http://www.cob-net.org/church/pvcob.htm
*****