Cruise control
#1
#2
#3
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dtony, I ordered the Rostra unit because I don't know how to fix the OE cruise. Unfortunately, the Rostra has a rather large box and there is very limited space in which to mount it under the hood. I may still do it but as yet I haven't found the time. A few weeks ago a member posted that he replaced the vacuum dump valve and fixed his.
Possibly some senior members will post what you need.
Cheers, RagJag
Possibly some senior members will post what you need.
Cheers, RagJag
#4
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I Just fixed my cruise. Last year when I did my spark plugs and cap I noticed that the metal caps on each end of the vacuum diaphragm were lose and would leak vacuum, so I removed, cleaned and siliconed them back in place. While I had the unit off I jumped the electromagnet valve on the front plate to ensure it was operating (it was).
When I road tested after reinstalling still no go.
How the heck do you test a system that doesn't turn on till 60 km/hr?
I bypassed the vacuum control valve for the cruise control (small valve with electrical plug and a vacuum line in and one out to the diaphragm) and road tested and It worked as it should.
When I jumped the valve with 12v I could hear it click, so I assume its a fault in a switch or wiring.
Seems to work without so I'm good for now.
Possibly you have a similar problem
When I road tested after reinstalling still no go.
How the heck do you test a system that doesn't turn on till 60 km/hr?
I bypassed the vacuum control valve for the cruise control (small valve with electrical plug and a vacuum line in and one out to the diaphragm) and road tested and It worked as it should.
When I jumped the valve with 12v I could hear it click, so I assume its a fault in a switch or wiring.
Seems to work without so I'm good for now.
Possibly you have a similar problem
#5
Join Date: Mar 2008
Location: Pacific Northwest USA
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Resealing the servo/bellows end plates often does the trick. Sometimes it's just a blown fuse (suspect the release switch shorting of the fuse blows again). Sometimes as simple as a soft vacuum hose that collapses shut.
More reading:
Cruise Control
Cheers
DD
#6
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On my '92 v12 the cruise stopped working because of this small plastic washer........part 4. It goes soft and pulls out.
Speed Control Actuator-5.3 Litre - Parts For XJS from (V)179737 to (V)226645 | Jaguar Classic Parts UK
Speed Control Actuator-5.3 Litre - Parts For XJS from (V)179737 to (V)226645 | Jaguar Classic Parts UK
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