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Discussion Starter · #1 ·
I've swapped a 1994 4.6 dohc into my 1966 Mustang project. I also pulled the wiring harness and PCM.
I would like to swap out the PCM from a later model car with ODB2. I have no problem rewiring into the connector to make this work. Will the new PCM run the engine? Will I need to have the program modified? I'm comfortabel repinning the connector and reading schematics. I just am not sure how the engine management will work. thanks
 

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Maybe yes, maybe no. Ford has a tendency to change various electrical components across years and across models within years. One example would be the constant control relay module (CCRM) which controls the fan, fuel pump(s) and A/C if I remember correctly. You can not just interchange CCRM's from year to year or model to model within a year because Ford has made them differently. Can you eventually win the battle probably yes but you will fight a tough fight. When you are done you still need to purchase tuning and data logging software to manage the ECU in its new home. That will approximate $1K. You would minimally be in the neighborhood of $1.5 to $2K before you were done.

You would be far better off to use the OEM engine harness already on the engine and get a plug an play ECU from an aftermarket provider that can marry up to it. My recommendation would be one of the MS3Pro Plug-n-Play units from DIY Autotune <= clickable. For a single purchase and price you get the ECU, the tuning software, the data logging software instrument panel support for New Edge instrumentation an amazing number of engine safeties to protect the engine and completely unobstructed programability with expansion options that wil likely far exceed your plans.
 

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Probably, but you should run IMRC delete plates. Properly cammed and tuned you will find little if any use for the OEM IMRC plates. Additionally, in a comparison between the "B" heads that used IMRC plates and the later "C" heads that didn't, the "C" heads would be the better choice for the engine and give you much better intake manifold choices.
 

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It shouldn't be too difficult, I'm running a 5.4 DOHC in a 1954 ford. I started with a 1995 MK VIII main harness, tried to get the PCM to work with TWEECER chip and was a no go. found a 1996 T-Bird PCM which eliminates the EDIS and wired the coils to PCM, did not have to change any sensors. I did have to reprogram some PCM parameters with the TWEECER chip. Runs beautiful. 13.6 in the Quarter mile. I am going to work on a 1996 MK VIII I have the Cobra intake and Cobra cams I have a 1997 Cobra PCM I'm hoping for plug and play. With combining different PCM, wire Harnesses you should get the EVTM manuals for the PCM and verify wiring Ford did change pin locations for every year.
 

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Discussion Starter · #9 ·
Maybe yes, maybe no. Ford has a tendency to change various electrical components across years and across models within years. One example would be the constant control relay module (CCRM) which controls the fan, fuel pump(s) and A/C if I remember correctly. You can not just interchange CCRM's from year to year or model to model within a year because Ford has made them differently. Can you eventually win the battle probably yes but you will fight a tough fight. When you are done you still need to purchase tuning and data logging software to manage the ECU in its new home. That will approximate $1K. You would minimally be in the neighborhood of $1.5 to $2K before you were done.

You would be far better off to use the OEM engine harness already on the engine and get a plug an play ECU from an aftermarket provider that can marry up to it. My recommendation would be one of the MS3Pro Plug-n-Play units from DIY Autotune <= clickable. For a single purchase and price you get the ECU, the tuning software, the data logging software instrument panel support for New Edge instrumentation an amazing number of engine safeties to protect the engine and completely unobstructed programability with expansion options that wil likely far exceed your plans.
Thanks I'm checking out DIY Autotune now.
 
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