Cruise Control Fix
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Junior User
Joined: Sep 2004
Posts: 56
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From: Central California
Cruise Control Fix
My '91 F350 has cruise control but it hasn't worked right in years. It would "hunt" (speed up and slow down) too much for comfort. So I stopped using it. Then my anti-lock brakes gave a warning light and I traced that to the rear axle sensor. After replacing that (cheap and easy fix) the ABS worked fine.
That was a couple of years ago. The other day I was driving on the freeway and just for grins I punched the Cruise Control "ON" and "SET SPEED". Lo and behold it WORKED! No hunting at all, steady as a rock.
I conclude that the Cruise Control must also use the ABS speed sensor in the rear diff. As the sensor was going bad but hadn't actually failed, the CC would get confused and "hunt".
Note: I didn't look up the CC circuit in the shop manual (too lazy). If I'm wrong about this, I'm still happy it works again.
-otf
That was a couple of years ago. The other day I was driving on the freeway and just for grins I punched the Cruise Control "ON" and "SET SPEED". Lo and behold it WORKED! No hunting at all, steady as a rock.
I conclude that the Cruise Control must also use the ABS speed sensor in the rear diff. As the sensor was going bad but hadn't actually failed, the CC would get confused and "hunt".
Note: I didn't look up the CC circuit in the shop manual (too lazy). If I'm wrong about this, I'm still happy it works again.
-otf
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Junior User
Joined: Sep 2004
Posts: 56
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From: Central California
Originally Posted by quicklook2
i hope you know about the recall on cruise switch.
i think it covers 91 also.
call ford with your vin number and they would know.
i think it covers 91 also.
call ford with your vin number and they would know.
-otf
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Originally Posted by onetonfan
That was a couple of years ago. The other day I was driving on the freeway and just for grins I punched the Cruise Control "ON" and "SET SPEED". Lo and behold it WORKED! No hunting at all, steady as a rock.
I conclude that the Cruise Control must also use the ABS speed sensor in the rear diff. As the sensor was going bad but hadn't actually failed, the CC would get confused and "hunt".
Note: I didn't look up the CC circuit in the shop manual (too lazy). If I'm wrong about this, I'm still happy it works again.
I conclude that the Cruise Control must also use the ABS speed sensor in the rear diff. As the sensor was going bad but hadn't actually failed, the CC would get confused and "hunt".
Note: I didn't look up the CC circuit in the shop manual (too lazy). If I'm wrong about this, I'm still happy it works again.
Elder User
Joined: Mar 2004
Posts: 580
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From: Chippewa Falls, WI
I just had the speed control recall taken care of and it takes about 5 min. They just basically put a fuse inbetween the switch and the cc wiring harness. The tech at the dealership said that it was like a one in a billion chance of anything happening. Apparently the only case of fire he knew about was more caused by a modified cc system than a actual defect but the media got a hold of the info and blew it out of proportion. Still probably a good idea to get it fixed it is free afterall.
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Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
This post was about a 91 and I do not think they have this pressure switch on the MC, I think they had a vacuum switch on the brake pedal.
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Elder User
Joined: Mar 2004
Posts: 580
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From: Chippewa Falls, WI
yeah, I kind of exagerated a little bit but he did make it sound like a pretty rare event. I still thought it was strange that it took ford so long to figure out how to fix it. Especially when I saw how reasonably simple the fix was. I was kind of expecting to end up with a new cruise servo or something mean like that. I really don't care, as long as it works and my truck is not 1:whatever.
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Junior User
Joined: Sep 2004
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From: Central California
Originally Posted by hillbilly44
is it 4 wd or 2 wd?
subford,
If the CC has nothing to do with the ABS sensor, then I wonder why it is working again. Arrrgh, I hate mysteries, I may never know what happened. Maybe it's a Christmas present from Santa. LOL
-otf
