I recently bought a 2000 Disco II. So I am trying to right all the wrongs the previous owner did. It came with a stack of service records so quite a bit of maintenance repair has been done. It has 112,000 miles. My latest issue is the cruise control. The dash switch lights up but I cannot get the unit to set. I have checked fuses and such but cannot find a visible problem. My 3 amigos are on, can that affect it?

 

You need to check for a vacuum leak on a cruise control hose.
Start at the brake pedal and follow the cruise line(s) and check for cracks.
Repair/replace any bad hose.

 

Does your horn work?

 

The most common hose to have a vaccum leak, as Spikementioned, is the hose is located on the passenger side behind the battery. The hose is short (1' or so) and can usually be repaired by clipping the hose end. If that doesnt work you might have a leak further down... But that 1' hose is a very good place to start.

That was my original leak and clipping the hose worked for about a year. Now I've got one somewhere else, so the search is on...

 

Cam-buy this stuff and Wal-mart and goop up all the ends of the vacuum lines.

http://www.plastidip.com/industrial_...cal_Insulation

Thats what I did, gooped all the connections let it cure overnight, gooped again.
that was 3 years ago and the cruise still works.

 

My cruise jerks the gas petal pretty hard. Is that caused by a vacuum leak also?

 

Awesome, I will try that!

 

No, the cruise works off of vacuum, no vacuum no cruise.
So if it is jerking it maybe the cruise ecu needs re-programming.
There was a TSB on this, call your dealer.

 

The previous owner had just put a new battery on so that might be the problem. I am only getting 14 MPG was hoping by setting cruise at 60 MPH might get a little better.

 

I get about 20mpg @ 60mph, and about 18mpg at 67mph. The mpg just goes down exponentially after that LOL.

edit: This is without my cruise on, my cruise can't maintain a steady speed.