Electrical 90 mustang cruise control advice

Brad Hanks · Jun 22, 2018

Hello all, looking for some fixes for my mustang cruise control. It will not turn on, nor has it ever worked since the day i bought it.
Things I have checked/ observed: speedometer works, it is a 5.0 5 speed and clutch safety switch appears to work (clutch pedal has to be all the way down to start) both cables are attached to throttle body, new buttons on steering wheel, horn works, all three taillights work and do not stay on, brake lights work, has over 150000 miles on it.
Any help on this would be appreciated.

General karthief · Jun 22, 2018

Check the vacuum lines to the cruze control canister and check for power at the switch. I 'll hit up my manual for some specific things to do.

Brad Hanks · Jun 22, 2018

To the servo right? And not 100% on how to check power to the switches.

jrichker · Jun 22, 2018

Dump the codes, look for codes 27 or 29 which are speed sensor codes.
Check to see if the cigarette lighter works - it shares the same circuit/fuse as the cruse control system.

Dump codes sticky

Look at the top of the 5.0 Tech forum where the sticky threads are posted. One of them is how to dump the computer codes. Codes may be present even if the CEL (Check Engine Light) isn’t on. You don’t need a code reader or scanner – all you need is a paper clip, or if your lady friend has a hair pin, that will do the job.
I highly suggest that you read it and follow the instructions to dump the codes. http://www.stangnet.com/mustang-forums/threads/how-to-pull-codes-from-eec4.889006/

Brad Hanks · Jun 23, 2018

The cigarette lighter does work, I checked all the fuses with a volt meter and they are all good. I’ll try dumping the codes the next I’m working on it. Thanks.

BlakeusMaximus · Jun 23, 2018

Could be your VSS sensor at the trans

Brad Hanks · Jun 23, 2018

Even if my speedometer is still working fine?

jrichker · Jun 23, 2018

Brad Hanks said:
Even if my speedometer is still working fine?

The Mustang you have has a mechanical speedometer that does not use the VSS sensor.

BlakeusMaximus · Jun 23, 2018

no VSS sensor?? I replaced mine when my cruise wasn’t working and it fixed my cruise control. Cheap part too.

Blown88GT · Jun 23, 2018

Brad Hanks said:
...both cables are attached to throttle body....

Cable broken at servo.

General karthief · Jun 23, 2018

I think what he was say'n was the vss does not drive the speedometer, just for the cruise

Blown88GT · Jun 24, 2018

General karthief said:
I think what he was say'n was the vss does not drive the speedometer, just for the cruise

VSS is also used to tells the computer when to turn on the IAC motor to control idle on deceleration and such..without it, on a mass air computer, the car can/will stall coming to a stop sign and between downshifts and situations like that. It can also cause other idle surge problems

Causes a code 29 to show. Research that you'll find more answers, but, yes, you need it if you're using a mass air ford eec iv to control the engine

BlakeusMaximus · Jun 24, 2018

General karthief said:
I think what he was say'n was the vss does not drive the speedometer, just for the cruise

Right. Gotcha.

Brad Hanks · Jun 24, 2018

I’ll check all these out, thanks. My dad has a 93 and the cruise works on it, I’ll see if I can borrow his vss sensor to see if that’s the problem.

BlakeusMaximus · Jun 24, 2018

Let us know, my money is on that sensor.

Brad Hanks · Jun 24, 2018

Ok, will do. I know when I first got the car it didn’t work and it didn’t have any codes, I don’t know if that makes any difference.

jrichker · Jun 24, 2018

Brad Hanks said:
I’ll check all these out, thanks. My dad has a 93 and the cruise works on it, I’ll see if I can borrow his vss sensor to see if that’s the problem.

Dump the codes and find the problem. The process is clearly detailed with lots of pictures. You risk damaging the speedo cable and the VSS sensor if it isn't removed and installed properly.

Brad Hanks · Jun 24, 2018

The cruise never worked and had no codes for years, I don’t mean any disrespect by saying this, but do you think that will help find the issue?

Brad Hanks · Jun 24, 2018

Fair enough.

BlakeusMaximus · Jun 24, 2018

Try a new VSS sensor

Electrical 90 mustang cruise control advice

Brad Hanks

General karthief

wonder how much it would cost to ship you a pair

Brad Hanks

jrichker

StangNet's favorite TOOL

Brad Hanks

BlakeusMaximus

Still got to try a little lube on my speedo head

Brad Hanks

jrichker

StangNet's favorite TOOL

BlakeusMaximus

Still got to try a little lube on my speedo head

Blown88GT

General karthief

wonder how much it would cost to ship you a pair

Blown88GT

BlakeusMaximus

Still got to try a little lube on my speedo head

Brad Hanks

BlakeusMaximus

Still got to try a little lube on my speedo head

Brad Hanks

jrichker

StangNet's favorite TOOL

Brad Hanks

Brad Hanks

BlakeusMaximus

Still got to try a little lube on my speedo head

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Electrical 90 mustang cruise control advice

wonder how much it would cost to ship you a pair

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wonder how much it would cost to ship you a pair

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