Computer trouble
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Computer trouble
I'm trying to find a computer for my truck, its a '94 ford f-150 4wd, 302 and e4od transmission. The number off mine is f4tf-12a650-aaa, and was wondering if a f2tf-12a650-aha will work. Could someone please let me know. Thanks
Fleet Owner
Joined: Oct 2005
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From: Kentucky
I don't think those two are a direct swap. The PCM that starts with F4TF is a Mass Airflow (MAF). The one that starts with F2TF is Speed density.
What issue are you trying to resolve with a PCM swap?
What issue are you trying to resolve with a PCM swap?
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Thanks for replying, i'm actually trying to fix a harsh shifting problem, first I thought that it was the transmission so I had that rebuilt but the problem continued, and my mechanic told me that the computer was shot, so I was trying to find one to fit, he told me that the number didn't have to match, but come from a similar truck, but i'm not having any luck, guess i'll just have to buy a new one. Thanks for replying.
Lead Driver
Joined: Aug 2006
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From: Sand Lake, MI
No don't buy a computer, at least not yet.
Hate to say it but you probably didn't need a rebuild either, at least not if all it was doing was shifting hard. Slipping yea but not if it was only a shifting problem.
The computer should have some codes stored now that you've driven it around again.
Try pulling the codes and let us know what happens, post any codes given and if the computer responds correctly or not.
See here if you aren't aware of how to do so,
Ford Fuel Injection How To Run a Self-Test
At this point I doubt there is anything wrong with your computer, more likely to be electrical problems between it and the trans or another sensor causing the issue.
Hate to say it but you probably didn't need a rebuild either, at least not if all it was doing was shifting hard. Slipping yea but not if it was only a shifting problem.
The computer should have some codes stored now that you've driven it around again.
Try pulling the codes and let us know what happens, post any codes given and if the computer responds correctly or not.
See here if you aren't aware of how to do so,
Ford Fuel Injection How To Run a Self-Test
At this point I doubt there is anything wrong with your computer, more likely to be electrical problems between it and the trans or another sensor causing the issue.
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Thanks for the info, I had to rebuild the transmission because I blew ( all the seals and it was leaking bad) it and when I had it checked there were burned clutches and the torque was bad, so the guy checked all the wires and said that when he disconnected the ground the truck didnt shift hard, so it had to be the computer, because he checked the connections and transmission and everything was good.
Fleet Owner
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From: Easton,Ks
The transmission does not have a ground wire. What did he do, drive it with the battery disconnected?
No those two will not swap. The PCM that starts with F4TF is for a CCD Ignition system and the one that starts with F2TF is for a fixed Dwell Ignition system.
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computers
thought i'd ask here since you guys seem to know about computers
I'm trying to find a computer that is compatable with my 91 straight 6 4 speed manual. originally it was a E1M, i found a C2M. will this work. the only difference in the ford part numbers are the second digit and the second to last. one is AEA, the other is AHA
thanks!
I'm trying to find a computer that is compatable with my 91 straight 6 4 speed manual. originally it was a E1M, i found a C2M. will this work. the only difference in the ford part numbers are the second digit and the second to last. one is AEA, the other is AHA
thanks!
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Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
thought i'd ask here since you guys seem to know about computers
I'm trying to find a computer that is compatable with my 91 straight 6 4 speed manual. originally it was a E1M, i found a C2M. will this work. the only difference in the ford part numbers are the second digit and the second to last. one is AEA, the other is AHA
thanks!
I'm trying to find a computer that is compatable with my 91 straight 6 4 speed manual. originally it was a E1M, i found a C2M. will this work. the only difference in the ford part numbers are the second digit and the second to last. one is AEA, the other is AHA
thanks!
#F1TF-AHA L6 4.9 GAS w/M.T. Federal Emissions.
#F1TF-AEA L6 4.9 GAS w/M.T. Federal Emissions.
They should be close and should work but they do have different programs in them but I do not know what the difference is in the programs.
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Freshman User
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yes, they are the program codes on the outside. the truck runs with the other computer, it just takes a couple trys to start and run smooth. maybe it is another problem i am missing, but i didn't get any codes with the C2M computer. It's from a 90 and my truck is a 91
Fleet Owner
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From: Easton,Ks
yes, they are the program codes on the outside. the truck runs with the other computer, it just takes a couple trys to start and run smooth. maybe it is another problem i am missing, but i didn't get any codes with the C2M computer. It's from a 90 and my truck is a 91
There are no 1990 4.9L light trucks that have a computer number ending in AEA or AHA.
I need the whole number to try and find out what it when into.
Fleet Owner
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From: Easton,Ks
F2TF-ATA L6-300ci 4.9L FI FED W/MT
F1TF-AEA L6-300ci 4.9L FI W/4 & 5-SPD MT
It looks like both are for the same engine and Transmission.
But there was a big change in the trucks from 1991 to 1992 so I am not sure if all the computer pins match or not as I do not have the pin out for the 1991 computer.
Also I do not know if the 1991 Computer was Fed or Calif.
F1TF-AEA L6-300ci 4.9L FI W/4 & 5-SPD MT
It looks like both are for the same engine and Transmission.
But there was a big change in the trucks from 1991 to 1992 so I am not sure if all the computer pins match or not as I do not have the pin out for the 1991 computer.
Also I do not know if the 1991 Computer was Fed or Calif.
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New User
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no, is there not a ground wire on the computer, he said the truck had high epc pressure, so he checked the transmission and it was all good, so he trailed the wires and when he took the ground wire off of the computer the pressure droped back to normal, and then the truck shifted ok.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
If the ground wire is off the computer the engine will not run.
No injector firing.
No fuel pump running.
And no computer shifts of the transmission at all.
If he cut the EPC wire from the transmission to the computer the pressure would be very low and the transmission would slip.
/
No injector firing.
No fuel pump running.
And no computer shifts of the transmission at all.
If he cut the EPC wire from the transmission to the computer the pressure would be very low and the transmission would slip.
/
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Thanks for the info, I guess I have no idea. I was only going by what he told me, but what ever he did, when he did it, the truck actually shifted correctly, for the first time in over a year, guess i'll have to check into it a little more, thnaks.