[s-cars] Cruise control debugging
Wayne Dohnal
wd1 at hevanet.com
Sun May 15 20:02:35 EDT 2005
I agree with prior posts that suggested the highest probability cause of
cruise control problems is the pedal switches, and this was the problem when
my cruise control quit working. It would be a waste of time and money to
replace another component without checking this out first. I isolated my
problem by removing the windshield washer resivoir and cruise control vacuum
pump. I then "hot wired" the vacuum pump to open the throttle about half
way. At this point, if the throttle holds its position over time then it
might be a control module or other electrical problem. But most likely the
throttle position , which you can easily see from up top, will slowly close,
indicating a vacuum leak. You can then isolate the leak one component at a
time, but you may as well start with the pedal switches. Just plug the
hoses going to them, run the vacuum pump again, and see if the problem is
temporarily fixed.
If you don't mind a little micro-surgery, it's not that hard to open up the
pedal switch and replace the o-ring, which will most likely fix the problem.
I had a suitable o-ring in my junk collection, but I imagine it's easily
available at a hardware store.
Wayne Dohnal
1994 S4
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