ecm's or can I swap computers?
 

my 90 f150 has a very high (2600) idle. I narrowed the problem down to the ecm. Its either faulty or has a bad ground/short.

My question can I swap a computer from a nother year/vehichle into the truck. It is an eec iv. My junk yard has two truck.....I have the pin out diagram for the 86-92? if I change the pins can I do it???

RE: ecm's or can I swap computers?
 

Sometimes you have 'some' room as far as years.. But PCM's are 'build specific' and should be checked/referenced to the case number on the PCM.. For instance,, a PCM from a truck of the same year that was optioned with an automatic, and was replaced with a PCMfrom a manual trans truck wouldn't work.. Nor would a V8 into a 6 ect.. Most dismantlers have an interchange book for referencing applications by the number on the unit, and/or should be able to locate you a good used unit with your number... If they can't, post your PCM number, with the two available if close to the same year/options

RE: ecm's or can I swap computers?
 

of course the spare ECM I have came from a 4.9L.... the two at the yard are codeA1Z and FUNO the FUNO is a 94. I don't know the other one... I know the A2Z is for a 5.8 I think there is a POP2 also. I know the PQP2 is a 4.9 but haven't a clue about the POP2...
Any decoding help is appreciated.

RE: ecm's or can I swap computers?
 

It would be the part number below the bar code like F5TF-12A650-BTE (happened to be one sit'n in front of me)

So yours is a 5.0, guess'n auto.. not manual correct?

RE: ecm's or can I swap computers?
 

5.0 Manual trans. 4x4 floor shift
only2 I can see as the other ones in the truck:
F3TF-12A650 NC
F3TF-12A650- ADB

Mine is a F0TF-12A650-T2A (yep thats correct)

Worked on it again today....just cant get the IAC to kick down unless i cycle the key/ignition.Called for computer at the parts stores 3-10 days and a $45-75 core charge.

RE: ecm's or can I swap computers?
 

Looks like..

F3TF-NC is for Base/Supercab F150-250 truck, 4.9L6 W/Manual Fedral Emissions.. 93-95..
F3TF-ADB is for E150-350 4.9L6, Auto trans/C6 (non E40D) 94-95

Does that look like the applications they were pulled from?

RE: need help with a 5.0 problem!
 

this is my first time useing a forum so i hope im not butting in.
i got a problem with a mustang i purchased a year ago i belive its a ecu deal.
its a 1990 5.0 5 spd with a lot of mods but im not sure if it was an autoconverted to a 5 spd
before i got it. it was in a auction so i dont know who built it.
it runs great untill i push in or let out the clutch or if i stick it in gear it some times dies?
this has been driveing me crazy! iv check all my wireing and grounds with no results.
if any one has heard of any thing like this please let me know.
im ready to just go buy a new ecu to try but i know that that can get pricey if its not the problem.
i have changed out wireing hareses on these cars before so i am a little familiar with them.

RE: ecm's or can I swap computers?
 

They cab was the only thing left of the trucks...one was a stick and the other auto...
You are begining to amaze me with your god like powers off decoding : ) the 12A650 seems standard what is the F*TF and last 2 or 3 digits???

Gonna call all my shops tommorow and get me a computer by thursday!

ECU

RE: ecm's or can I swap computers?
 

Prefix letters/numbers are..

F.. is for the decade built (90's)

3.. is the last digit of the year of introduction or revision

T.. is for specific model (Truck)

F.. is an engineering number for General Parts/Electrical and Electronics Division

12A650 is Ford speak for the ECU/PCM

Suffix letters and/or numbersare more model/option specific identification

RE: ecm's or can I swap computers?
 

149.95 I will have it by noon tommorow. Coulda got it for 112...Saturday delivery :(
Thank you Hayapower for all the info. I'll post to let you know how it turned out.