928 1986 cruz control

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03 May 2011 11:19 #4689 by jjpg1
928 1986 cruz control was created by jjpg1
My cruz control will not work.
The local international auto shop has replaced if i understand it right all parts that work the cruz control. After all of that and $2300. later he thinks there is a problem in the vacuum system. He has smoke it and found no leaks and then clamped off the vacuum going to the heater leaving no heater fuction. The cruz started working after that for about 30 miles and than quick.
Can anyone help with this problem.
Thank You,
John P
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03 May 2011 11:46 #4690 by pcar928fan
Replied by pcar928fan on topic 928 1986 cruz control
That sucks bad and sounds overly expensive to me. Not sure where you are at, but a 928 specialist mechanic would doubtfully have got that much of your money before giving you a REAL answer to what the problem was/is.

I am sorry you have spent so much and that I can't be of more assistance. If it were a vacuum problem you would get it to work but it would always be slowing down as it was not holding a vacuum. My guess is they missed something like a fuse or relay in the system somewhere or didn't hook something up correctly. I assume the "controller" was replaced and that is the common culprit.

James
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05 May 2011 05:59 #4699 by finally!
Replied by finally! on topic 928 1986 cruz control
Might also check the switches in driver footwell, there is one for the brake and clutch. After replacing my master and slave cylinders my cruise quit working. Thought I had disconnected a vacuum line but lo and behold the switch needed adjustment in the footwell so it made contact and was depressed. Could be a short there..

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11 May 2011 14:11 #4769 by lrpman
Replied by lrpman on topic 928 1986 cruz control
1. IF the vac was GOOD when you disconnected the heater THEN the valve for the heater is the source of the vacuum leak.
2. Check the foot-well, good call
3. Mine still is not working and I am now down to the cruise control actuator under the hood as the problem.
Roman was not built in a day and a 928 uses the same logic when working on them.

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