EEC-IV questions!
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5th Wheeling
Joined: Jun 2022
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EEC-IV questions!
I have a 84' F-250 with a Feedback carb setup, and I have the EEC-IV system. I mess with Arduino and Raspberry Pi all the time and got a Speeduino for a project. I am curious if anyone has tried reverse engineering the EEC-IV system? I want to maybe run the truck off the Speeduino so I can monitor the sensors and tweak them as needed to get it running good. Problem I am wondering is the Firmware or programming Ford used in the EEC-IV system. Is the code available to download or flash to another Control unit?
FTE Legend
Joined: Nov 2015
Posts: 30,935
Likes: 4,123
From: Angier, NC
You may want to join up over at Gary's site as I think he has messed with what you want to do a little.
https://forum.garysgaragemahal.com/
https://forum.garysgaragemahal.com/
Dave ----
https://forum.garysgaragemahal.com/
https://forum.garysgaragemahal.com/
Dave ----
Moderator
Joined: Jan 2001
Posts: 56,992
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From: Virginia
The hard part will be interfacing with the TFI module for the timing. That is mainly what your system does when it has a carb on it. Yes the carb has a solenoid that is pulsed by the computer to vary the air to fuel ratio, but its very crude. If you could come up with something to control the timing on the TFI, that would be very interesting to a lot of people.
Lead Driver
Joined: Jul 2011
Posts: 8,679
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From: On the Edge of the Desert
You know what I do on the carbureted EEC-IV engines?
Take it all out. It basically doesn't do anything except complicate an otherwise simple operation. I've removed it from 3 or 4 trucks and haven't looked back. It's absolutely pointless to have on a carb'd engine. You can't tune a carb from a computer. The most it could do is adjust the timing.
All of that is achievable (and better so) in regular old tuning.
My most sincere advice is don't waste your time or money. There's no benefit to be made trying to update 40 year old engine management technology. Ford themselves moved on to better systems shortly after.
Take it all out. It basically doesn't do anything except complicate an otherwise simple operation. I've removed it from 3 or 4 trucks and haven't looked back. It's absolutely pointless to have on a carb'd engine. You can't tune a carb from a computer. The most it could do is adjust the timing.
All of that is achievable (and better so) in regular old tuning.
My most sincere advice is don't waste your time or money. There's no benefit to be made trying to update 40 year old engine management technology. Ford themselves moved on to better systems shortly after.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
+1 on that... not for a carb anyway.
If you're going through all that trouble you really should upgrade the motor to full an EFI, the 90's version will bolt right on whatever motor you have and to see everything that is going on inside the PCM you just need a Moates Quarterhorse module and a copy of Binary editor on a laptop, the module plugs into the J3 port on the rear of the PCM and with that you can modify and change anything you want.
If you're going through all that trouble you really should upgrade the motor to full an EFI, the 90's version will bolt right on whatever motor you have and to see everything that is going on inside the PCM you just need a Moates Quarterhorse module and a copy of Binary editor on a laptop, the module plugs into the J3 port on the rear of the PCM and with that you can modify and change anything you want.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
That is something you will have to research, I thought it was permitted to "upgrade" a carbed motor to EFI but that is just something I think I remember reading... don't know if there is any truth in it.
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Joined: Jan 2001
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From: Virginia
Luck may be on your side, your computer system is old. So they may not be able to plug into it to check for codes. If they can't, then you can do some things to the engine to make it run good, and hopefully you should be able to pass smog also. But you will probably have to leave a bunch of junk on it so it will pass the visual test. Another positive, this stuff is so old, most techs probably don't know what it's supposed to look like.
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