Trying to get right PCM
Thread Starter
|
Trailering
Joined: Aug 2024
Posts: 18
Likes: 0
Trying to get right PCM
I have a 93' f-150 automatic with a 96' 5.8l out of a 250. Took it to a local shop and they told me the PCM is bad. The problem is the PCM in the truck is for the 5.0 that originally came with the truck and they don't know the VIN for the donor truck and don't know the PCM that is supposed to be with that motor. Can someone help point me in the right direction in finding the correct PCM for that motor.
Mountain Pass
Joined: Apr 2020
Posts: 240
Likes: 30
From: NC Mountains
I have a 93' f-150 automatic with a 96' 5.8l out of a 250. Took it to a local shop and they told me the PCM is bad. The problem is the PCM in the truck is for the 5.0 that originally came with the truck and they don't know the VIN for the donor truck and don't know the PCM that is supposed to be with that motor. Can someone help point me in the right direction in finding the correct PCM for that motor.
The fellar on here said he had good luck with them.
Thread Starter
|
Trailering
Joined: Aug 2024
Posts: 18
Likes: 0
I recently had to replace my PCM. When I took the original out and opened it up the 3 capicators on the board were leaking. I found a seller on ebay that sells 3 cap sets with the cap values for Ford. and may have yours . Had to sharpen up my soldier skills Got the caps in but still had issues with the original. So now I have gotten real good at swapping them out. The used one had 1 bad cap so prior to re-removing the orig. I just replaced all 3 in the used PCM and popped it back in. Runs like a champ "For now" As to a different PCM in a certian truck Yesterday one of the fellars on here gave me the name of an electronics shop that rebuilds them. They might could figure out the correct PCM, they seem to have a Wide variety they work with.SIA Electronics https://siaelec.com/
The fellar on here said he had good luck with them.
The fellar on here said he had good luck with them.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Why does the shop think the existing PCM is bad?
We have seen posts going both ways stating a 5L Speed Density PCM will run a 5.8L engine, others stating their experience is otherwise. If the computer is bad, I would go with a 5.8L version that matches the transmission currently in the vehicle and the model since the emission system is different for the F150/Bronco versus the F250/F350.
We have seen posts going both ways stating a 5L Speed Density PCM will run a 5.8L engine, others stating their experience is otherwise. If the computer is bad, I would go with a 5.8L version that matches the transmission currently in the vehicle and the model since the emission system is different for the F150/Bronco versus the F250/F350.
Thread Starter
|
Trailering
Joined: Aug 2024
Posts: 18
Likes: 0
Why does the shop think the existing PCM is bad?
We have seen posts going both ways stating a 5L Speed Density PCM will run a 5.8L engine, others stating their experience is otherwise. If the computer is bad, I would go with a 5.8L version that matches the transmission currently in the vehicle and the model since the emission system is different for the F150/Bronco versus the F250/F350.
We have seen posts going both ways stating a 5L Speed Density PCM will run a 5.8L engine, others stating their experience is otherwise. If the computer is bad, I would go with a 5.8L version that matches the transmission currently in the vehicle and the model since the emission system is different for the F150/Bronco versus the F250/F350.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
The ICM supply voltage comes from Fuse U in the engine compartment fuse box. The PIP signal from the distributor goes to the ICM and computer (PCM). With the SPOUT in the computer controls the timing, SPOUT out the ICM triggers off the raw PIP signal.
We need more details of the issue(s) you are experiencing. And what has been replaced already.
Basic Ignition diagram for your 1993 model year truck below.
We need more details of the issue(s) you are experiencing. And what has been replaced already.
Basic Ignition diagram for your 1993 model year truck below.
Thread Starter
|
Trailering
Joined: Aug 2024
Posts: 18
Likes: 0
The ICM supply voltage comes from Fuse U in the engine compartment fuse box. The PIP signal from the distributor goes to the ICM and computer (PCM). With the SPOUT in the computer controls the timing, SPOUT out the ICM triggers off the raw PIP signal.
We need more details of the issue(s) you are experiencing. And what has been replaced already.
Basic Ignition diagram for your 1993 model year truck below.
We need more details of the issue(s) you are experiencing. And what has been replaced already.
Basic Ignition diagram for your 1993 model year truck below.
Trending Topics
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Thanks for the additional details. None of the symptoms point to low voltage to the ICM. Most likely a bad computer. Key symptom is a continuous running fuel pump.
I would seek out a 1993 PCM for a F150 with a 5.8L engine and same transmission as yours. There are probably a few catch codes that meet that criteria.
I would seek out a 1993 PCM for a F150 with a 5.8L engine and same transmission as yours. There are probably a few catch codes that meet that criteria.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
Thread Starter
|
Trailering
Joined: Aug 2024
Posts: 18
Likes: 0
Thanks for the additional details. None of the symptoms point to low voltage to the ICM. Most likely a bad computer. Key symptom is a continuous running fuel pump.
I would seek out a 1993 PCM for a F150 with a 5.8L engine and same transmission as yours. There are probably a few catch codes that meet that criteria.
I would seek out a 1993 PCM for a F150 with a 5.8L engine and same transmission as yours. There are probably a few catch codes that meet that criteria.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Your truck is a 1993 model year. You need a computer compatible with the truck, not the donor engine.
1993 models are using the older Push-Start ignition. 1994 and up are Computer Controlled Dwell (CCD) ignition.
Your 1996 donor engine from a F250 has a different emissions setup than your F150. No idea what someone did to get it to work.
Your best bet is using a 1993 computer from a F150 with the same transmission and a 5.8L engine. Using one for a later model is opening up another can of worms.
1993 models are using the older Push-Start ignition. 1994 and up are Computer Controlled Dwell (CCD) ignition.
Your 1996 donor engine from a F250 has a different emissions setup than your F150. No idea what someone did to get it to work.
Your best bet is using a 1993 computer from a F150 with the same transmission and a 5.8L engine. Using one for a later model is opening up another can of worms.
Thread Starter
|
Trailering
Joined: Aug 2024
Posts: 18
Likes: 0
Yeaaaa it required some hacking and cutting stuff out to get it to fit and all of it to work. Probably one of the messiest swaps I've seen.
Thread
Thread Starter
Forum
Replies
Last Post