You might want to check the vacuum line mounted to driver side firewall adjacent to power brake booster. It's a line that hangs down from the fitting. Fixed my cruise control. HTH
where can I purchase cruise control cable for my 1988 Mustang GT Automatic. This is the cable that attaches to the Throttle body linkageI have a 1991 5.0 LX with auto trans and my cruise control doesnt work, I dont think I have ever seen a fox body mustang with a working cruise control system. What goes wrong with them? How do I fix mine?
Exactly what I did for my 86. I had a later model steering shaft with cruise and stripped out the harness and cruise/horn rings. Bought some 01 Cobra cruise buttons and mimicked the Momo cruise button solution on my stock non-cruise wheel. When I bought my used cruise components I made sure that it came with the fender mount, body plug, wiring harness and computer, throttle cable and trans harness.I actually just picked up all the cruise components to install the system in my car. My car was never equipped with it, but I added the Saleen style cruise buttons to my Momo wheel and decided I wanted a functional system.
The servo, cable and module are easy to find. The steering column harness can be a little tricky. Pedal assemblies are different as non-cruise assemblies doesnt habe the mounts for the vacuum dump and the clutch switch. However, the brackets bolt onto the pedal box so you can strip the parts and add it onto a non-cruise box.
the column wiring harness (at least on 84-89) cars lacks 1 wire for the cruise. So you need to replace this one harness with the 3 contact fingers. The harness, cruise module and clutch switch all plug into existing wiring.
the biggest hurdle for me is the cruise vacuum dump switch plastic depresser doesn’t work well with the MM hydroboost pedal. I’ll need to fabricate something for this.
Easy install once you have the parts. Weight isn’t that much. 6-7 pounds? Many guys are stripping them out of cars. eBay tends to be a bit spendy for good servos and cables, but if you find someone who still considers these parts worthless you can get them cheap.