[xj-s] 1983 xj-s cruise control

XJ-S
1

thanks to all who tried to help w/ my CC problem.

Though I’m inclined to agree with Kirby that the chance of both solenoids
getting stuck in the wrong place at the same time is pretty remote, I did decide
tonight to try to find out why the system didn’t work when the backup dump valve
was hooked up.

The solution was simple and probably so obvious to everyone but me that no one
bothered to mention it…the short vacuum line from the dump valve to the intake
manifold was leaking so badly that the bellows didn’t have a prayer of getting
pulled closed. It had been fine until apparantly being disturbed during some
other procedure. The valve was working fine all along. Once the line was
replaced w/ new rubber, all was well.

Now I have to check all the other vacuum lines for leaks.

					jb
2

In a message dated 97-06-11 21:02:09 EDT, 103136.3056@CompuServe.COM (john
bertsche) writes:

thanks to all who tried to help w/ my CC problem.

Though I’m inclined to agree with Kirby that the chance of both solenoids
getting stuck in the wrong place at the same time is pretty remote, I did
decide
tonight to try to find out why the system didn’t work when the backup dump

valve
was hooked up.

The solution was simple and probably so obvious to everyone but me that no

one
bothered to mention it…the short vacuum line from the dump valve to the
intake
manifold was leaking so badly that the bellows didn’t have a prayer of
getting
pulled closed. It had been fine until apparantly being disturbed during
some
other procedure. The valve was working fine all along. Once the line was
replaced w/ new rubber, all was well.

Now I have to check all the other vacuum lines for leaks.

One of the best ways to fix a Jaguar is to go thru the car and replace every
single piece of rubber vacuum line the minute you get the car! Don’t wait
until all the small leaks may or may not pop up. Bad rubber and British cars
go hand in hand. Any Jaguar over 5 years old with any original rubber hoses
or tubes is a head ache waiting to happen. Hint: get a roll of 20 feet or
so of vacuum line and one at a time go thru your car replacing every line you
can find. Do not plug or disable any line! Even if you do not then know
what it appears to do. V12 Jags are a maze of vacuum lines. . Plugging one
cause you don’t see an obvious function is folly!

Enjoy

Gerald
89 XJ-40
86 XJ-S Awaiting new engine rebuild