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2003 Super Duty with 24valve cummins

16736 Views 19 Replies 6 Participants Last post by  Saul

2003 Ford F-250 Super Duty Crew cab short bed 4x4. Was a 7.3 truck from the factory.

2001 5.9 24 valve cummins engine

4r100 transmission with electronic t-case

Destroked Billet Flex plate
Destroked 5.9 to 4r100 adapter
PCS trans controller

Its more or less a project not complete.

-It runs and drives but trans does not shift correctly. feels as if motor is hitting a rev limiter when tryin to shift gears.

-the wiring is ummmm wow (see pics). cant believe it runs.

-when in park runs fine at idle and when you rev it up to higher rpm's

However the engine came from auto truck. I've been told to swap to manual ecm or get it flashed at local dodge dealer......well i called dodge today and they said the can only update it to software of auto status.

Although i have located a ecm at a local wrecking yard but seems a bit pricey.

I have a ford FSM for 2003 Ford and working on getting wiring diagrams for 2001 dodge cummins truck.

YIKES! 7.3 harness

Plugs from 5.9 engine harness next red elbow.


another shot of 5.9 engine harness plugs

wires to injection pump (ahhh dude used black wires everywhere!!)

A pic of the truck if it all matters


Do i swap to manual ecm?
Do i swap to manual engine harness as well?
Or What is wrong aside from the wiring mess?

ALL in ALL Steel @ GOS Performance is great help and has earned my business
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Did you put the Dodge PCM in the truck. The ISB Auto/Manual ECM calibration shouldn't be changing much.
I only have the ECM thats mounted on the side of the block of the dodge electronics.

It sounds like the changes need to be made in the PCS 4R100 controller. Does it have definable shift points? What does the PCS controller use for input; TPS? I see the wire ties/splices coming from the TPS.
They guy only had 2 wires from the PCS running to the motor. TPS and RPM signal. I'm sure more of those wires need to be hooked up just not sure which ones. As for the shift points kinda whenever it wants to, nothing really definable. I believe you are on the right track it has to do with the pcs business. l will read through the book and intall program on to my computer so i can hook it up to see whats going on.

I have a manual harness but you don't need it. IIRC, the auto ECM/harness just has additional outputs to the PCM.

Pull that factory lift pump and fuel filter housing. Put a good lift pump or system on there like an AirDog. A small block chevy fuel pump cover will bolt-up to cover the hole that lift pump leaves on the side of the block.
It has a Industrial Injection VP44

Gauges? Do you have a fuel pressure gauge? You need one. If that stock lift pumps goes out and you don't see it you will be shopping for a new VP44 as well.
Yeah gauges are top priority. what would you recommend? analog or buy a chip that has digital read out?

Thanks for the help
i got it this way. I will decipher what the guy has going on with the wiring. And check your thread for sure. thanks again.

Tell me I'm not the God of PCS tuning on a 4R100?!? LOL
There is NO doubt about that. You sir are PCS 4r100 GENIUS! You took a complete disaster of previous owners attempt and made it work.....Great!!!

Ya works a million times better. I can actually drive it to the store. LOL
Yeah guy had TPS hooked from the PCS harness hooked up wrong. Steel @ GOS also went over the file the previous owner made for the 4r100 and fixed that disaster. He knows his stuff!! now to clean up the the wiring mess and do some mods in the future.
yes. i'll get a airdog or fass from GOS. its just taking up space in shop right now. havent had much time to mess around with it. just savin my pesos so i can order what i need at will be like christmas.

goin to swap to a manual trans. just a preference.
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