Troubleshooting cruise control

[smoore]

I have a '93 Explorer and the cruise control worked off and on intermittently and finally quite working. I went through a bunch of threads on this site and I think I narrowed it down to a bad cruise amplifier or a bad servo. I checked the fuses, the horn works, vacuum lines seem properly connected and good, and the vacuum dump valve is properly adjusted.

How can I narrow it down between the cruise amplifier and the servo--are there any tests I can run or anything to look for to tell if one or the other is good or bad? Thanks!

 

[gloomis]

smoore,

I've got two Ex's that have had cruise issues - both have ended up being bad amps.
Plus, I picked up one already bad amp at the yard.

There is a way to test the working of the servo - I did it before I finally tried a swap of amps and discovered the "new" one was bad too.
I'll look it up and PM it to you.

But my money is on the amp.

 

[JDwornik]

Any one have a pic of the cruise amp? I would like to get my cruise working again!

 

[rocco123]

Mine was the AMP by the glove box. Installed one from a F-150 years ago & it still works. Rang out all the switches first.

 

[JDwornik]

Any pics of this part? Sorry new to this era of explorers

 

[gloomis]

JD,

I think I've got an extra one in my tool bag - I'll check on it tomorrow.
It's mounted above the glove box and has two rectangular, multi-wire plugs plugged into it.
Most I've seen have been mostly green in color - about 6" x 4" x 1.5".
(But I think the spare one I have is red.)
It's got a small bracket attached to it that mounts with two screws - one on each side of the catch for the glove box door.

By the time I wrote all that, I could have went out and got my spare.
But already got my feet propped up and the door locked.

 

[JDwornik]

I know what your talking about now! Any way to check these?

 

[rocco123]

No way i know of to check the box itself. You should first check the wiring & switches to verify that they are good first. Then, look at the box you have & just hit a junkyard and grab a box out of a explorer or truck looking for a match.

 

[prince402]

Thanks to this forum and this thread I fixed my cruise control that failed intermittently. Otherwise I would have been at a total loss. Thanks, everyone, and I am happy to give back the following that my be helpful to someone here.

I removed the green amplifier in the glove box and inspected the circuit integrity on the board first with my naked eye and then with a jeweler's magnifying glass. To my naked eye the circuits looked OK but under magnification I found a tiny crack. I resoldered the cracked circuit area and it is now working fine. Be sure to use as much magnification you can to inspect the circuit integrity.

 

[TravisP]

How do you test the cruise control module/transducer ?

I have a 91 Eddie Bauer
How do you test the cruise control module/transducer ?
Mine is black, not green or red.

Thank you

 

[rocco123]

Good deal. Feedback of the fix is always appreciated...otherwise is all problems without verified solutions

 

[rocco123]

Good deal. Feedback of the fix is always appreciated...otherwise is all problems without verified solutions