Cruise Control Disengaging
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Cruise Control Disengaging
I have tried to read about the possible causes but haven't seen anything like what is happening:
'99 SD in sig: Under load (10,000 LB) while in overdrive going around 65 MPH and up a hill, when the engine begins to labor the cruise control will shut off.
Any ideas?
'99 SD in sig: Under load (10,000 LB) while in overdrive going around 65 MPH and up a hill, when the engine begins to labor the cruise control will shut off.
Any ideas?
Senior User
Joined: Aug 2003
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From: Port Orchard, WA
Not sure except I saw a vacuum leak in my old GMC that acted that way. I replaced the hoses, never saw/found the leak, and they worked after that... weird I know... but from my perspective, it seemed that I must have had a really really small pin hole leak in the system...
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Thanks for the replies. It has never done this before and that would rule out the safety feature. As far as a vacuum leak? Could be, but I would think it would act up under normal driving as well.
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Joined: Sep 2003
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Originally posted by Big Orn
Thanks for the replies. It has never done this before and that would rule out the safety feature. As far as a vacuum leak? Could be, but I would think it would act up under normal driving as well.
Thanks for the replies. It has never done this before and that would rule out the safety feature. As far as a vacuum leak? Could be, but I would think it would act up under normal driving as well.
Post Fiend
Joined: Jan 2002
Posts: 5,859
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From: USA
If you say this has never happened before ,on the same hill towing same load?
Well ,you could have a couple things happening
1)faulty brake switch (very sensitive)
2)clutch sw (sensitive)
3)abs module not getting correct info from all sensors (2 in the front ,1 rear diff vh speed sensor )
Or this is the nature of the beast ,i don't use cruise too much ,just was looking in manuals for you,there was nothing said about if speed is lost it would cut out.
Rich
Well ,you could have a couple things happening
1)faulty brake switch (very sensitive)
2)clutch sw (sensitive)
3)abs module not getting correct info from all sensors (2 in the front ,1 rear diff vh speed sensor )
Or this is the nature of the beast ,i don't use cruise too much ,just was looking in manuals for you,there was nothing said about if speed is lost it would cut out.
Rich
Posting Guru
Joined: Aug 2002
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From: Jacksonville, FL
Re: Cruise Control Disengaging
Originally posted by Big Orn
I have tried to read about the possible causes but haven't seen anything like what is happening:
'99 SD in sig: Under load (10,000 LB) while in overdrive going around 65 MPH and up a hill, when the engine begins to labor the cruise control will shut off.
Any ideas?
I have tried to read about the possible causes but haven't seen anything like what is happening:
'99 SD in sig: Under load (10,000 LB) while in overdrive going around 65 MPH and up a hill, when the engine begins to labor the cruise control will shut off.
Any ideas?
look on left side, 2nd link down. Cheap enuff anyway to try, or ask this in the electrical forum here. Many quick answers there from some great guys.
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Thanks, men.
I realize that most people don't recommend using the cruise control while pulling 10K plus trailer weight, but the V10 has the power so I just let it go.
Thanks for the link, jax250, I will check it out.
I realize that most people don't recommend using the cruise control while pulling 10K plus trailer weight, but the V10 has the power so I just let it go.
Thanks for the link, jax250, I will check it out.
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Postmaster
Joined: Mar 2001
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From: So Cal
My 94 F250 460 will usually drop out of cruise while towing an 8,000# trailer up steep hills. Normally it will down shift and rev up and try to maintain speed but eventually it will drop out if the hill is long or steep enough.
My guess as to why your truck does it now but not before is maybe just random chance, state of tune, weather conditions(surprisingly large effect), or like some of the other guys said, might be a control or sensor problem.
I have had several cars that also do this without towing, just sttep hills.
Good Luck,
Jim Henderson
My guess as to why your truck does it now but not before is maybe just random chance, state of tune, weather conditions(surprisingly large effect), or like some of the other guys said, might be a control or sensor problem.
I have had several cars that also do this without towing, just sttep hills.
Good Luck,
Jim Henderson
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Post Fiend
Joined: Jun 2003
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From: NE Texas
I was thinking that maybe it could have been a vac leak at first, but after checking and rechecking it's more than likely the deactivator switch.
Again, thanks, jaxf250, for the link and I think that's what I will do. Changing the switch looks simple.
I always work my truck - push it to the limit - everytime I get in it and feel sure that that in itself could be some of the problem. But I have always done that, since my first truck (58 International) and believe that's what they're made for.
It sure is satisfying to know I (we) can turn to each other on matters that would most times put our mechanics at odds.
Again, thanks, jaxf250, for the link and I think that's what I will do. Changing the switch looks simple.
I always work my truck - push it to the limit - everytime I get in it and feel sure that that in itself could be some of the problem. But I have always done that, since my first truck (58 International) and believe that's what they're made for.
It sure is satisfying to know I (we) can turn to each other on matters that would most times put our mechanics at odds.
Elder User
Joined: Aug 2003
Posts: 519
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From: New York
make sure you fuel system is in tip top shape, a clogged fuel filter may cause some problems with allowing the cruise to stay engaged. does your RPM'S jump up out of no where while you are driving w/o the cruise on at a steady pace? if so it may very well be a fuel filter that needs to be replaced along with the sending unit. but with all these fancy computer sytems now-a-days it can be anytyhing. good luck.
-bigdawg
'03 FX4 F250SD SC Long Bed 5.4L w/ X springs
-bigdawg
'03 FX4 F250SD SC Long Bed 5.4L w/ X springs
New User
Joined: Jul 2003
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From: Casa Grande, AZ
I owned 99 F250 Super Duty Power Stroke Diesel and Tioga Motor Home on E-450 Frame with the V10 Both of these from new have done the same thing as you describle under load up hill. Dealers have never been able to give me a good answer. Reason is they just don't know! My GM Trucks roll right up the hill and never kick out unless I release the cruise. Go figure! I think it is a Ford Problem.
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Post Fiend
Joined: Jun 2003
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From: NE Texas
I don't really think it's a "problem" Nutz5. It could very well be the best thing for a manual transmissioned vehicle to prevent damage to the motor when lugging. If that is the case, then mark one up for Ford. On the other hand if my deactivator switch is getting weak, then I will be able to let you all know after I replace it this weekend.
In the meantime I will continue to search for clues.
In the meantime I will continue to search for clues.
Posting Guru
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From: I'm lost somewhere in NJ -- can someone please find me?!?!?!?
I specifically recall reading in the manual for my 2002 F-250 that if speed loss occurrs while in OD and OD is not able to recover the speed within a time limit through its own accelleration rate, it will disengage to prevent damage to the vehicle. Just thought I'd share this tid-bit with you.