surveyor Posted June 18, 2011 Share Posted June 18, 2011 Hope everyone is having a nice weekend !! Need some of the members expert advice please !! 1997 Discovery........fixed cruise back last fall by replacing all vacumn lines.....worked like a charm afterward. Now all of a sudden it has started acting up. Sometimes when I hit the set button it will engage ......sometimes it won't. I cut off using dash switch....give it a little time and then cut it back on via dash switch......hit set button....it will engage for a few seconds and then disengage. Just very erratic.. The only other thing I have noticed is that about the same time as the cruise started acting up the rear windows did too. Sometimes they work...sometimes they don't ! They too were working perfectly prior to this. HELP ! Thanks, Doug Quote Link to comment Share on other sites More sharing options...
teabag Posted June 19, 2011 Share Posted June 19, 2011 OK help with what? and welcome to the forum Cruise probs are 95% down to the vac tube being split. Quote Link to comment Share on other sites More sharing options...
piper109 Posted June 19, 2011 Share Posted June 19, 2011 I had similar unpredictable symptoms. I checked everything out per the '96 Rave diagnostics and everything pointed to a bad Cruise ECU but everyone said otherwise. My Vacuum lines were all new and the pedal switches all worked properly. The steering wheel switches were dismantled and cleaned out with an electrical contact product. After checking and rechecking, I eventually sent off my ECU for repair and its worked perfectly ever since. See if you can borrow a known good ECU before you pull out too much hair. I borrowed two others and they were bad too. Steve Quote Link to comment Share on other sites More sharing options...
surveyor Posted June 20, 2011 Author Share Posted June 20, 2011 Thanks guys....I will give it a try !!! Quote Link to comment Share on other sites More sharing options...
Niamh Posted June 20, 2011 Share Posted June 20, 2011 When you went through the diagnostics, how fast did the vacuum pump operate the actuator? Niamh Quote Link to comment Share on other sites More sharing options...
piper109 Posted June 21, 2011 Share Posted June 21, 2011 When you went through the diagnostics, how fast did the vacuum pump operate the actuator? Niamh When I went through the diagnostics, I was getting no output from the ECU to the vacuum pump. Hence the ECU repair. Now it works and I cant be exact on the speed. Maybe 1-2 secs to full collapse of the bellows. Steve Quote Link to comment Share on other sites More sharing options...
Niamh Posted June 22, 2011 Share Posted June 22, 2011 I'm going to have to actually check that at some point as all the diagnostics in Rave are with the ECU disconnected. Next time I'm playing with it I'll see what sort of speed I get... I know that once actuated the system holds a vacuum as I swithed off the pump but left the solenoid on. Niamh Quote Link to comment Share on other sites More sharing options...
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