Cruise Control
Thread Starter
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Senior User
Joined: Jan 2011
Posts: 131
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From: Charlestown,IN
Cruise Control
got a 95 4x4 auto and all of a sudden the cruise contol has stopped working. Does anybody have any suggestions on where to start running down the problem? Checked the fuse and all is ok there. gettiing ready for a road trip and would really like to have it working. Thanks in advanve for the help.
Thread Starter
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Senior User
Joined: Jan 2011
Posts: 131
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From: Charlestown,IN
Recall?
Din't know there was one for the cruise. All I knew about was the one for the Master cylinders that caught fire....which Was done after it caught fire and now have a nice circle of missing paint on the hood
I Checked and that is the recall I was talking about.
Din't know there was one for the cruise. All I knew about was the one for the Master cylinders that caught fire....which Was done after it caught fire and now have a nice circle of missing paint on the hoodI Checked and that is the recall I was talking about.
Postmaster
Joined: Mar 2001
Posts: 4,968
Likes: 3
From: So Cal
Check the vacuum lines on your engine. Especially those hard plastic red/white/black? ones that go to the heater/AC controller on the firewall. Sometimes the "plug" will pull loose or the lines will crack and create a vacuum leak which can cause the crusie control to stop working, or other problems depending on which line.
Also check the linkages of the cruise control to be sure the cables etc are connecting to the throttle.
BY any chance is your speedo acting up? If the needle jumps around, it is possible the speed sensor is failing and confusing the engine computer and cruise control.
Good Luck,
Jim Henderson
Also check the linkages of the cruise control to be sure the cables etc are connecting to the throttle.
BY any chance is your speedo acting up? If the needle jumps around, it is possible the speed sensor is failing and confusing the engine computer and cruise control.
Good Luck,
Jim Henderson
Junior User
Joined: Mar 2010
Posts: 62
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From: Yucaipa
Just fixed my cruise control today...My cruise just suddenly stopped working....Lived with it for 2 months. Just did my oil change and found the cruise control brake switch was leaking its on top of brake reservoir. Replaced the switch and now I have cruise control again.
Postmaster
Joined: Dec 2007
Posts: 3,052
Likes: 1
From: Jacksonville FL
Most likely its the Cruise servo module. They can get rusty and stop working. Very common problem.
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Fleet Owner
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From: Easton,Ks
I have hear GM trucks had a cruise control but never been in a GM truck to see one.
I have four Ford trucks that have a device on them to keep the speed the same as you drive down the road and it is called Speed Control.
Here is a image of my SPEED CONTROL Module:
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Postmaster
Joined: Mar 2001
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From: So Cal
The vacuum doesn't directly control the cruise but various lines will affect what the computer sees which then as I said can cause different things to happen.
Whenever I work on my 94 F250 460, passenger side of engine, I often dislodge the vacuum lines and wierd problems pop up including, no cruise, weird shifting, check engine light etc. Just plug the lines back in and the "problem" is fixed. Since the problem is often fixed by plugging the lines back in I have to assume the vacuum was the problem. Otherwise it must be my waving of hands over the engine doing it. It would be interesting to unplug each line and see what it does, or just check a vacuum "wiring" diagram.
Sometimes it isn't obvious that the line is disconnected since the plug "Looks" like it is in place. I especially seem to disturb that plug with three lines into it on top of the AC box.
Besides the fix and inspection is free so doesn't hurt to check.
Jim Henderson
Whenever I work on my 94 F250 460, passenger side of engine, I often dislodge the vacuum lines and wierd problems pop up including, no cruise, weird shifting, check engine light etc. Just plug the lines back in and the "problem" is fixed. Since the problem is often fixed by plugging the lines back in I have to assume the vacuum was the problem. Otherwise it must be my waving of hands over the engine doing it. It would be interesting to unplug each line and see what it does, or just check a vacuum "wiring" diagram.
Sometimes it isn't obvious that the line is disconnected since the plug "Looks" like it is in place. I especially seem to disturb that plug with three lines into it on top of the AC box.
Besides the fix and inspection is free so doesn't hurt to check.
Jim Henderson
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
The vacuum doesn't directly control the cruise but various lines will affect what the computer sees which then as I said can cause different things to happen.
Whenever I work on my 94 F250 460, passenger side of engine, I often dislodge the vacuum lines and wierd problems pop up including, no cruise, weird shifting, check engine light etc. Just plug the lines back in and the "problem" is fixed. Since the problem is often fixed by plugging the lines back in I have to assume the vacuum was the problem. Otherwise it must be my waving of hands over the engine doing it. It would be interesting to unplug each line and see what it does, or just check a vacuum "wiring" diagram.
Sometimes it isn't obvious that the line is disconnected since the plug "Looks" like it is in place. I especially seem to disturb that plug with three lines into it on top of the AC box.
Besides the fix and inspection is free so doesn't hurt to check.
Jim Henderson
Whenever I work on my 94 F250 460, passenger side of engine, I often dislodge the vacuum lines and wierd problems pop up including, no cruise, weird shifting, check engine light etc. Just plug the lines back in and the "problem" is fixed. Since the problem is often fixed by plugging the lines back in I have to assume the vacuum was the problem. Otherwise it must be my waving of hands over the engine doing it. It would be interesting to unplug each line and see what it does, or just check a vacuum "wiring" diagram.
Sometimes it isn't obvious that the line is disconnected since the plug "Looks" like it is in place. I especially seem to disturb that plug with three lines into it on top of the AC box.
Besides the fix and inspection is free so doesn't hurt to check.
Jim Henderson
Mines is hooked to the Ring Gear.
Lets see now can a PCM Computer check for vacuum any place? I can not seem to think of any sensor for vacuum that gives information to the PCM Computer so the PCM Computer can ground the wire coming from the PSOM and shut down the Speed Control Module.
All in all lets not send somebody on a wild goose chase for a vacuum leak when vacuum has nothing to do with the Speed Control Module.
The Speed Control Module is a separate item and is not influenced by the Computer or vacuum.
Senior User
Joined: Feb 2010
Posts: 222
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From: Lakeland, FL
I've heard this was common. Would a bad servo cause all functions of cruise control to stop working? I have nothing. No cruise light, nothing. Absolutley nothing happens when I press the button. (Yes, fuse is good)
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
What year are we talking about?
Is this a F-seres truck?
Senior User
Joined: Feb 2010
Posts: 222
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From: Lakeland, FL
Its 93 F350XLT
I guess a servo is something else I can seach the junkyards for...
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Is the RABS light on the dash on?
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