I’m new here and need help because I can not figure anything out. So here is my problem. I have a 1996 f250 7.3 automatic 4x4 and it was running and driving great until it started doing odd stuff with the transmission. It would come out of gear in overdrive and then go back in if I let off, or sometimes I would have to stop and shut the truck off and then it would be fine after turn it back on. Then it also started delaying the shift into drive and I would have to rev it up for it to go into drive. Then it started getting worse and worse until it wouldn’t move in drive and the only way to get it to move was to shift through 1-2 and then into drive. Now we come to the last week or so, and I have put in a “new” used trans and it was running as close to perfect as an OBS can for one day. Then it started acting up again. But this time it wouldn’t shift out of first in drive. And if I gave it any amount of hard throttle it would come out of gear. Now I got it to shift but it’s still weird. It takes forever to shift it won’t shift until like 2500 or so and then it just holds it around there until 3rd. Now here is the very weird thing. I checked my tps or pedal position sensor. And it only measures .21 at idle and 2.4x at wot. I checked it with a Dorman unit and it said the same mine read a 10th higher. I’m stumped as what it could be. If anybody has any suggestions it would be greatly appreciated. If I can’t figure it out I will be selling the truck unfortunately.

thank you

 

You're going to have to check for codes for the more knowledgeable trans guys to chime in.

 

How do I check codes on an OBD1 truck?

 

It's not an bd1 truck, the OBD2 port is on the passenger side dash just under the glove box. And you will need a scanner capable of reading trans codes such as FORSCAN, SnapOn etc.

 

Ok I will see if my friends Snap On Solus will read it

 

However the truck has been driving better. It still acts up sometimes, it will kick out of gear when I first start it and put it in drive and accelerate. It will do it if I stop after driving right after start up. But after it kicks out 2 or 3 times it doesn’t do it after that. I will try to get codes and report what I find

 

Get one of these, download the Forescan app and you can read the codes. If you keep the truck you’ll pretty much have to have it.

 

Alright so I put a scanner on the truck and looked at the codes and the only codes it had were P0475, P0470, P1298. That’s what came up in the KOEO test. In the memory it only had P0475, P0470. I then ran a KOER test and it gave me P1111 only. So nothing transmission related. P1298 only came up after the buzz test and KOEO. I don’t think the IDM is bad because it runs fine. It’s my transmission that’s goofy or electrical to the transmission. Would the IDM affect the transmission in any way?

 

So nobody has any input??

 

I think you need to read codes with a scan tool that can read Ford transmission codes. I'll bet that the one you used can only read some of the engine codes and none of the transmission codes.

 

it was a Snap On Solus+ I would think if it can read the truck it can read the transmission too. But idk these fords are goofy

 

But I *DO* know, and many tools cannot read transmission codes.

The EPA requires that codes that effect emissions must be able to be read by all generic scan tools. Most transmission codes do not fall into this category, an Ford decided to not allow generic readers to be able to access them.

Forscan can read all codes in the vehicle. That's what I recommend.