Series 1 V8 Disco Cruise Control Fault.

[Discodriver]

Hi there,
After just posting about how great my Disco was, (and how much I loved it)!
I still do. but I thought I might ask on here if anyone has any idea about the cruise control on these things.
Namely mine doesnt work. I live out Rotherham way, and there are a lot of long boring roads between there and Christchurch.
I know it is totally lazy etc etc to use CC, but I also se it as a ticket, and fuel saver.

Is there anything in particular that can go wrong that I may be able to identify and repair? or is my best bet just to take it in to someone for a look?
Cheers.
Chris.

[lilpigzuk]

could be perished vacumn lines
Will try and find info I read not long ago....

[Ralfie]

Most common problem with the Cruise Control is a split in the vacum hose, usually at the 'T' behind the washer bottle.
Check all hoses for splits etc and see how that goes. Otherwise check that the switch is still connected. The 'set' controls on the steering wheel can sometimes play up. Be careful removing airbag if you go to check this out.

[lilpigzuk]

Firstly, trace the vacuum line from the actuator to the T-piece behind or next to your washer bottle (assuming V8 also). Grab a pair of needlenose pliers, and then pull the acuator diaphragm right in by hand, then clamp off the vacuum line coming out of the passenger side of that T-piece (the one going to the pump). Release the diaphragm, and it should stay where it is until you release the pliers. If it slowly lets itself back out, there is a split in one of the lines somewhere. It sounds like you've already trimmed the ends off at least at the actuator, and possibly at the T-piece, so the next thing is to stick your head up under your brake pedal, and check that the vacuum line is connected to the switch on your brake pedal, and is not split - they do often fall off there. The other place to check is where the vacuum line goes through the firewall, its common for them to perish there.

If your actuator does hold position, then its a computer, a steering wheel switch, or the little vac pump. I'd try lifting the vac pump out, running it with two wires off the battery, and join it straight to the actuator with a bit of hose......

[lilpigzuk]

To check the switches, you need firstly to locate your cruise ecu, which for a series 1 should be up behind the glovebox (push your hinges up and out through the gap so as to let the lid hang down fully). Its a small silver box, on the LH side. If there is more than one, I believe it will be the smallest, from memory. You need to unplug the loom from it, and probe the terminals in that plug on the loom, while you operate the switches (with ignition on). You should get a power signal at two seperate terminals, one from the set switch, and one from the reset switch.

I'm not too sure if you get a power signal from the brake switch, or whether it simply dumps the vacuum and thats it. I THINK it may be the latter.

all from rover forum on outerlimits

[Discodriver]

Awesome!
Thanks! will have a look tomorrow and see if I can figure it out, will let you know!

[Discodriver]

Found the problem!
There was no hose running from the diaphragm to the "T" !
All good now thanks everyone for allowing me to keep my lazy ass from having a foot on the accelrator.

[Bulletproof]

Found the problem!
There was no hose running from the diaphragm to the "T" !
All good now thanks everyone for allowing me to keep my lazy ass from having a foot on the accelrator.

Landrovers are reknown for surprises , you just have to come to grips with it . Self dimming headlights, intermittent wipers etc etc

I own some ,I know

Cheers Richard

[mitsi88]

My v8 had a similar fault - was just a cracked pipe end. The cruise control definitely helps if you are minded to try and save fuel. Using mine on trips I can get 500km out of a tank!