finally got the color I was looking for and the price was right ! everything works except the cruise control. anyone have any thoughts on what the issue might be? I did read something referring to a rubber bellows that control the vacuum on some earlier models ? another learning process to start !

 

WowowowowO! What a beautiful thing! Envy runs thru me.

Have a photo of the V and the engine bay...?
In mine, the cruise control is a fairly complicated system involving a careful and precise interaction between a couple of different systems. In mine, in the engine compartment, there are solenoid actuators that provide, hold and release vacuum INTO and with a bellows that you will find sitting in the top forward V of the engine. The actuators are wired (from memory) yellow and black and yellow and white with ground wires as well and are contained in the bellows unit itself. Some have suggested checking for current there as a good first start AND to check the vacuum lines TO the solenoids AND the little valve mechanism betwéen the intake plenum and the actuators. Also, check the switch and power there.

Braking is involved, trip computer is partially involved, SpeedO system,,, then what's under the hood. It's a bit.

I can offer this partial photo...of the 1990 Convertible pre facelift convertible wiring if that helps as a general set ideas of the systems involved.

 

First let's identify the system

Circa 1991/92 a change was made from the "AE Econocruise" cruise control to a newer system made by Kiekert or Valeo....or somebody. I can't remember. There's lots of repair info on the older system. The newer system, not so much

If your bellows looks like the picture below you have the older system


Cheers
DD

 

Dump valve broken or fixed.

 

Every time, I see a bellows, I think of a hand organ, the miniature accordion!!!!

Tis not that the bellows controls the vacuum, but that the vacuum controls the bellows...
Apology, I could not resist,

I'm on light duty. Bored !!! Cataract surgery was Tuesday. All is well . Too durn hot out, anyway
Except my neighbor Doing a major facelift of their charming English garden.

.

 

Exactly what was wrong on my 94. I got the part out of an XJ at the junk yard, a 93, and it’s been working ever since.

 

I would like to have that in garage Chevy!!!!!!!!
Show some pics of it.
Oh, nice Jag

 

Cruise control module could be unplugged or not working too. On my 4.0 it is mounted on the left rear wheel arch in the boot/trunk, not sure on the V12. Inside left trim panel will have to removed to see it.

 

where is that valve located? thanks

 

I have a thing for red cars !

 

Congrats! You have two beautiful cars right there sir!

what are these rims on your XJS ? I love them. I know they are OEM but I don’t know the model name

 

on the car when I got it. don't know the name.

 

Diamond-turned "Aerosport"

 

Number 11 in the picture.

 

found it, thanks. is there any way to test it to see if that is the problem?

 

That is BEAUTIFUL.

 

Put on 12V to see if the valve moves.

 

How’s much did you pay? If you mind me asking. I’m in the market for a xjs thank you

 

I vote for a damaged #21. The insulation under the hood rubs up on the rubber and eventually cuts a hole in it.

Easy to test. Pull the hose off the back of it, squeeze the bellows and then put your finger where the hose was. If the bellows doesn’t start to open up, then it’s good. If it expands, that’s your problem.