I have a 1993 F-350 non turbo, I just had a tranny rebuild, prior to that I would have a condition as follows: When I would reach the speed of 45 and upto 55 mph I would on a regular basis ( a couple of times per min. I would guess ) have the motor cut out, ( just like you turned the key off and right back on ) nothing before 45 and nothing after 55 mph. If I kept it out of OD this same thing would happen at a slower speed range. The tanny rebuilder check the codes and said I need a new throttle position sensor, I replaced this and now I get the cut out from 0 - about 45 - 50 mph then it smooths out. Any suggestions?
Thank you, David

 

Did you set the TPS to spec.? Did you check for codes after the TPS replacement? How about the tach sensor?

 

No to all of the above, We tried to put the PS in the same position as the old one. How do I find out the specs and then how do I set it to that?
How do I locate and test the tach sensor?
Thank you for the reply, David

 

TPS.....FIPL
To set to specs:
With a warm engine and the idle speed set to your engine specs probably 650 in drive (curb idle).

Now with key on engine off. First connect the negative lead of a volt meter to the negative battery post, then place a paperclip straightened to slide up the side of the center wire for a good contact, touch the positive lead to the paperclip. Electrical connector must beconnected to the FIPL.

If your FIPL requires resetting loosen the small torx screws and attempt to attain the correct setting. You can loosen the large bolts on the bracket if necessary but try to retain the centering on the FIPL/blade.

Your trying to get closed throttle voltage: 1.1 V, wide open throttle voltage: minimum of 3.8 V but not more than 4.3 V.

If you can attain those #s then tighten the screws/bolts and ensure the voltage is at the correct setting after tightening. You can also do a slow sweep of the fuel lever from idle to WOT to see if there are any blanc (dead) spots, much easier with a really $$$ meter with capture mode. If you still find there are hard shifts or very soft slippery shifts you can adjust to suit your driving but be warned slippery shifts will burn the trans up.

Tach info.........
The dead tach should send the automatic trans into a "failure management mode" (limp mode) with harsh engagements and firm shift feel, and an abnormal shift schedule.

Replace the tach sender on the oil fill housing a big 1" nut with 2 wires. Ford only part Engine RPM sensor E5TZ-17B384-A about $50. You can remove and clean it but usually changed later too. You can test it too, hold it in the air away from ferrous metal, using an ohm meter lead on each wire you need DC resistance between 2000-3000 ohms.