Cruise control not working
#1
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Hi all, the cruise control of my 1987 XJS V12 is not working. In my previous Vandenplas I always drove the car as much as possible on cruise control so as to avoid extra shifting and general ware of the vehicle. I intend to do the same on my recently purchased V12, as I want it to last a long time. Unfortunately this cruise control is not working. I tried everything as instructed in the manual, but no luck. Any suggestions?
BTW, I a so impressed with this forum and the kind suggestions from different members. I was helped to get my new oldtimer to run, suggestions on injector cleaners to stop a nagging knocking sound, etc.
Thanks,
Daan
BTW, I a so impressed with this forum and the kind suggestions from different members. I was helped to get my new oldtimer to run, suggestions on injector cleaners to stop a nagging knocking sound, etc.
Thanks,
Daan
#2
Join Date: Mar 2008
Location: Pacific Northwest USA
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JJS- Florida (04-27-2024)
#3
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One of the most common non-electrical failures is the bellows. It gets hard and leaks around the edges. Rockauto carries an aftermarket replacement. Seal the edges with RTV or similar.
The switches or switch adjustments are also a common issue. Pretty easy to test with a multimeter and the light tester mentioned above. Note that the cruise only works with the transmission in D. When you test that switch, wiggle the shift lever around a little to make sure the switch stays engaged and doesn't break the circuit randomly. I had that issue which I chased for a week; drove me crazy.
Please don't baby the engine. The V12 needs to be taken near redline occasionally for an Italian tuneup once warmed up. This helps keep carbon down and the plugs clean. Your engine will thank you for it. The V12 is a rugged engine if you keep the cooling system maintained and change oil regularly.
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JJS- Florida (04-27-2024)
#5
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Yes, this drove me crazy too. Once the cruise control worked in position D, once it didn't. For proper functionality, the lever must be pushed forward in position D. If you want to turn off the cruise control (no need to press the brake), just slide it back slightly. All in position D. At least that's how it works for me. My main problem with the cruise control body was a bellows leak. I bought a new one and sealed it with high temperature silicone. The filters in the solenoid body still need to be cleaned. If the electricity is fine. There is still one component - EAC7905 the cruise control dump valve, which should be functional. It's a safety solenoid.
#6
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Yes, this drove me crazy too. Once the cruise control worked in position D, once it didn't. For proper functionality, the lever must be pushed forward in position D. If you want to turn off the cruise control (no need to press the brake), just slide it back slightly. All in position D. At least that's how it works for me. .
There is an inhibit switch on the gearshift. I suspect yours needs some adjusting.
Cheers
DD
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