Ford 7.3L Power Stroke (1999-2003) :: Cruise Control Cuts Off While Driving
May 17, 2016
This has happened 3 or 4 times now while driving down the road. Just cruising down the road the CC will just cut out. I'll hit the "set accel" button on the wheel and all is good again until it randomly decides to do it again.
The only thing I've changed recently is the rear end speed sensor to cure the ABS light. I wouldn't/didn't think this would have any effect on the cruise control, but IDK, maybe I'll put the original one back in and test it.
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Cruise just stopped working. The fuses all check out ok. What would be the next simplest thing that I could check before turning the problem over to a mechanic?
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So the PO tells me he was flying down the highway and went to cancel his cruise control and it wouldn't turn off. He claims he made it to the shoulder of the highway and killed the ignition. When he restarted the truck is was turned off and it hasn't been used since. I tried to use it yesterday but couldn't get it to work?
So I do the search and find out that the deactivation switch is most likely the issue. I just picked up a new one today and was curious if it is just a R & R thing or if it needs to be bleed off or something? Is there a need to test it or just change it out? Sound like something that would cause these issues?
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RPM's are dropping way off when coasting downhill while towing (as if the motor shut down), CC is on and maintaining desired speed. When at the bottom of the hill, all of a sudden, with a big bang(in the motor) the rpm's have came back up and you drive on down the road as normal. This seems to happen only when towing. "99 F250 7.3 I haven't pulled any codes as of yet. Whats happening?
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I have a 2001 f350 7.3 powerstroke electric shift 4x4 auto trans, truck cruise control just quit, no illumination at dash, when switched on, checked all fuses they are good, owners manual doesn't say much...
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Airbag light flashes on dash and then stays on. Cruise control and horn wont work. I cant find a blown fuse.
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OK, so a friend's F150 just went up in flames in his driveway and he told me that the problem was the hot link behind a plastic/ rubber barrier at the main brake cylinder. I had a recall notice on my old truck but since I left the US and took the truck I never paid much attention to it, thinking typical overkill. Now I already heard from another buddy who caught lit brake fluid dripping onto the front tire and got the fire out before it spread and looked up the info today. Looks like our trucks are affected. Best to unplug the harness that goes into the brake master cylinder will prevent this problem from occurring? I never use cruise where I am, the roads are too small and slow.
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My issue can be while driving with cruise on, or accelerating, the truck just losses power, then recovers. At idle, the rpm can, but not always, fluctuate.
There is no "misfire" when it happens, but it just falls on its face. I have NO diagnostic tools, and my injectors are not stock, so I am unable to unplug my DP.
My thoughts are to unplug the ICP and give that a shot? Meanwhile, I will put in a order for a elm327
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The cruise control cuts out after driving for 25+ minutes. The rpm's rev up to 4000 and the speedometer goes wild just before cutting off. It can be reset but does not hold for long. Short trips and a cooling-off period for the engine seem to work. The dealer could not replicate the condition.
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The engine in my truck sometimes cuts out seems to be at idle. Takes a lot of cranking together going. Might be related but the electric fuel pump seems to run every time I turn the key on and if i sit with key off and the engine not going. I hear the pump come on again. No external leaks can be seen.
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I have changed pickup filter in tank and cleaned 2 tube filters in tank i thought that would fix it.
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Why is there a sensor on the brake master cylinder? Most other cars and trucks I've seen have tied the cruise control into the brake light (and clutch interlock if Manual transmission.) switch so that when the pedal is depressed, the cruise control cuts out.
In the Ex, could I tap the brake pedal enough that the brake lights come on yet I don't trigger the pressure sensor in the master cylinder to cut the cruise control?
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How to fix SES P0670?? I understand there's a whole procedure on checking fault.
P0670:GPCM Glow plug control module control line failure. Open/grounded circuit, open/shorted GPCM, failed PCM
But how did you resolve problem? replaced GPCM, found open circuit, short --if so where?-- or replaced with updated harness.
(4C3Z-12B568-AA connector upgrade kit as in picture)???
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Mine has done it a few times now. It seems to do it going up a very long gradual to steeper incline, such as climbing some mountains, when set to 60 MPH. It'll start dropping down until it gets to about 47 +/- MPH, then the cruise just kicks off. No downshifting in sight...
There's a stretch of route 219 through PA heading north towards NY that I encounter about once a month. Yesterday was the 2nd time I've had my Sonata on this trip, and it did it again. It actually did it twice last month on this trip.
The dealer reset the transmission computer due to very cold weather "slipping" from 1-2 shift after the first trip. It appears that didn't take care of this issue, though I didn't mention it to the dealer at the time (it slipped my mind).
I'm reluctant to take it to the dealer, since odds are they won't be able to duplicate the issue. We don't have any roads around here quite like the one this happens on.
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I had a nice level straight stretch in front of me and engaged the cruise control. No go! I tried a few more times and it still did not engage, even with various button sequences. My thought was that this truck is a computer on wheels. So at the next opportunity I stopped and shutdown the engine, turned the ignition switch OFF and then restarted started the engine (and rebooted the computer). The cruise control works fine!
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I have a 6.7 diesel extcab longbed 4wd with the 3.31 rearend. I have been experiencing a surge primarily told by the boost gauge when using the cruise control unloaded and either or both going up a steady climb in elevation or headwind. It does not surge if I shift down to 5th. Does not occur pulling a load. Still occurs in manual mode and tow-haul mode. Does not occur if your controlling throttle with your foot. I find that it happens at speed of 65-70. It will boost to about 10 pounds then fall to about 3 and will continue this until maybe a hill or change in direction. It does not occur with a tail wind. I took it to the dealer today and ford had a new flash for the pcm and the tcm. Hoping that this would fix it but I don't believe it did.
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Just looking for comments on using the cruise control while towing? and what's the recommended weight for using the tow haul mode. The enclosed trailer I have is about 3300 lbs. taking it across the country empty. 2004 6 liter.
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I've tried everything I can think of to get my cruise control working again to no avail. I have a late 99 with a 6 speed. So far I have checked all the fuses with a multimeter, I've checked continuity from the harness under the dash through the clockspring to the switches, truck does not start without the clutch pushed in so the neutral safety switch works, has the upgraded switch and harness off the master cylinder. the previous owner said the cruise was intermittent about a year after they did the harness and switch recall on it. is there a way to test the harness and switch? I got a 1800 mile round trip coming up in about a week and I am gonna have a sore foot if I cant figure this out.
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My cruise control stopped working today on my trip back from Yosemite. Tried looking through the owners manual, but apparently it doesnt have its own fuse. Everything else seems to work just fine, so I am gonna start there.
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I have been trying to figure my cruise control not working. I verified the switch for the brake pedal and the one on the master cylinder are not the problem. I have read about the clock spring but would like to verify signal is passing through/ not before replacing.
2 Questions.
#1 I have is how does the overall system work? Ok not that in depth but, is there some kind of servo that regulates the flow to,the injectors or is it strictly controlled by the PCM? and it tell the injectors to open to allow fuel to pass.
#2 Looking for a wiring diagram for the cruise control control circuit. Namely looking to verify switches are working.
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Heater control will not adjust, the one in the middle. I can turn it up and down, but it doesn't affect how much heat the heater is putting out. The other two work correctly. Do I have a bad switch or is the blender valve sticking? How can I tell? '99 F350, 1.25M miles.
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