Hi. I have a 1991 Ford F-250 7.3 Non turbo and it is not wanting to go into gear. I have rebuilt the transmission, replaced the transmission comp, and bought a new tach sensor. I can start the truck up without a problem. And the transmission will shift into reverse no problem. I have done everything that I know how to fix it. Any ideas?? Thank you.

 

have you adjusted the sensor on the side of the injection pump?
that might be bad or way out. let me see if i can find the info on adjusting it.

ok here is info on adjusting the TPS.
Get a multimeter and put the red lead on the middle wire on the TPS connector (might need to slip a paperclip in there if your probes aren't sharp). Put the black lead on the neg side of the battery or a good ground. With an already warm engine (fast idle solenoid off) turn your ignition key to on (just shy of start) and keep it there. Now loosen and adjust your TPS (two torqs screws) and adjust for .92 - .94 or so at idle. Tighten the screws. Now slowly actuate the throttle and look for smooth increase in voltage, up to about 3.8 to 4 or so is normal. If the voltage jumps around or there is any dead spots, replace your TPS. Napa has them pretty cheap


also does your tach work at all? if not that there could also be your issue. look over the entire engine harness for bad wires.

 

Thanks. I have already checked the TPS. I heard that there is a short of yellow wire that I needed to check. I dont know where that wire may be. Do you know where I can get a good some engine wiring diagrams so that I may find it.

 

cant help ya with wiring scematics.

 

is it manual or auto

 

It is an automatic. Any help/advice you could give would be appreciated.