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I’ve been dealing with erratic Shifting for a month or so now so I’ve done some research on this problem. I had it scanned and it gave a p0750 code for shift solenoid 1 so I dropped the pan changed the shift solenoid and the tcc new filter new fluid and got the same problem so I had it scanned again and it came up the same p0750 code . I’m at a lose so I’m doing some more research and I’m concitering changing the tcm and the speed sensors but was hoping someone could give some feedback if they have had this issue with there truck also.
Have you checked the plugup on the outside?
Pull it apart and check.
There is no TCM. The trans is controlled right from the computer through the harness.
Good luck.
I will definitely try that thanks for the feed back . Quick issue I noticed also is the overdrive light will blink and if I press the button the shifting gets really erratic . Thanks again I appreciate the help as I’m sure you know what a pain it can be chasing problems like this but I won’t give up until I figure it out .
no I was told it wasn’t necessary to re-learn the pcm but I will do that ASAP for sure and I will get back with the results . Thank you again to everyone I’ve gotten great input here in my first forums .
I do a full re-learn after replacing anything electrical now. I was told I didn't need to after replacing my MAF sensor (pre-ignition rattle was happening). I replaced the MAF, still rattled. Did the re-learn, no more rattle.
I had it scanned and it gave a p0750 code for shift solenoid 1 so I dropped the pan changed the shift solenoid
That code does not mean you should change the solenoid. As you've learned that code can set for other reasons than a bad solenoid. Quite often it sets for a wiring problem between the PCM and the transmission.
Unplug the harness from the PCM and from the passenger's side of the transmission. Get a wiring diagram, too. Electrically check for continuity of the SS1 wire, and also electrically check if that wire is shorted to power or to ground.
Changing the speed sensors is guaranteed to not fix your problem.
Thanks I’m going to try a relearn this morning and I’m praying it works I can’t say enough to everyone for the feed back but thank you much appreciated. I will post again with the results but thanks again to everyone.
The "relearn" would be a waste of your time, it won't change the underlying fault (an electrical circuit problem) which still exists. Follow Mark's advice above, he knows what he's talking about.
The "relearn" would be a waste of your time, it won't change the underlying fault (an electrical circuit problem) which still exists. Follow Mark's advice above, he knows what he's talking about.
It is especially a waste of time here since the transmission software doesn't do any learning. That didn't start until 1999 in the gas models, 2003 in the diesels.
Well you are right as far as a relearn goes it won't work thanks for the heads up it sounded like it made sense but i called ford they said it won't work also .I'm going to do what you said and check the wiring and see if i can figure out what is going on. Unfortunately electrical is not my strong suite but I have some experience with electrical issues but i can't afford what a shop wants to diagnose the problem so I really appreciate all the help. What really has me stumped is it will be fine light will shut off drive normal then out of nowhere stop to take off from a light and it will just rev up until i back off the gas then it shifts . Once i get over 35mph or 40mph and on the highway its fine . With what mark said makes a lot of sense . This truck also has a newer 4.2 liter with 13,000 on it now which was done before i owned it. It also is the original trans so with all the other odd things thats happen with this truck and electrical issues it would make sense that something is not right with the wiring . Thank you again for everyones help.
I’d like to thank everyone for your input and good advice on chasing down the problems with my truck. I actually have a weird issue now that I just can not figure out with this possessed truck of mine. So looking at my wires doing a continuity test and looking for damaged wires or ground wire problems I actually found the ground going to my starter is exposed and very brittle so that’s my next fix. While I was working on the truck I got interrupted by a heavy storm. The very next day I took the truck out and really haven’t found the problem and about 10 minutes into the ride the check engine light shut off and it’s been shifting as normal as I can remember so it’s neen off for about a week now anyone got some ideas because one I know there’s no way this problem just fixed itself and two I don’t have any luck . Just been a really head scratcher for me and I’ve dealt with some crazy things but this one is stumping everyone that has been in my truck before and now . Thanks again
Have you checked the plugup on the outside?
Pull it apart and check.
There is no TCM. The trans is controlled right from the computer through the harness.
Good luck.
[QUOTE=Mark Kovalsky;17892548]It didn't fix itself, you most likely moved things while checking it and that fixed it. It's probably a temporary fix.[/QUOTE. Hey how are you Mark ? Thanks for your help on my finicky pain in my butt truck . I was thinking the same thing actually I know there is no way it would be that easy especially with my luck . So I’m glad you replied I actually had a question for you about the wiring is it possible to just change the harness that goes to the transmission from the main harness or is that not and option reason I ask is I can get the same truck but with a blown engine that he warped the head so he is parting it out so I was wondering if that’s and option and would that be and easier way then chasing the wiring. I’m sure that’s probably not and option I was just curious if it’s possible. My other problem is this is my only vehicle so I’m trying to also not tie it up and fix things as I go but electrical like I said not my strong point but I’m more than capable of doing it just not a favorite of mine either . Thanks again for all your help I do really appreciate it very much . Oh one more thing can it be that the pcm itself is not working correctly either I did have a problem with my Ranger I had where it would run fine then it would just not stay running and when I tested it I had to change the whole thing . Sorry to be such a pain just curios if that could be a problem also . Thank you again mark.
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