EEC-IV Identification Help
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EEC-IV Identification Help
My name is Josh and ive been lurking around here for a while and learned alot of information from these forums. I am currently swapping my straight six out to put in a mildly built 351 windsor. I was wondering if there was any way to tell if the eec- IV i got with the motor is for an automatic or manual Transmission. My truck is a manual and i could go get another one from a manual truck, but i am scared that the existing computer may have a custom tune on it or something for that non factory spec engine. Any input will be greatly appreciated, Thanks 
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These computers cannot be custom tuned without an external module so it's unlikely you have anything but a stock computer. Post up a picture of the calibration decal on the connector of the computer or simply type the info into a post on this thread and I'm sure somebody will be able to ID what you have.
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From: Kentucky
I think Paul is referring tho the numbers illustrated here:
Send a photo of the Calibration Code (A9L in one of the examples) and the Ford part number (E9ZF-12A650-AA in the example) or listed them in your reply.
Send a photo of the Calibration Code (A9L in one of the examples) and the Ford part number (E9ZF-12A650-AA in the example) or listed them in your reply.
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Okay so that is good to know that the motor will run on the stock tune since it was running on fuel injection before i bought it. The code that is circled in the photos is E9D. the numbers below that are E9TF-12A650-AE1A. the number to the left of that one under EEC-IV is EFI-SD20B. And i will look at that link thanks for the heads up.
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For some reason it look like the code is not on there unless the EOD code listed is a typo and it was meant to be E9D. If that is the case i would have to go get a computer off of a manual truck correct? I also have another question. The connectors that came with teh 351 look to be exactly the same as the ones the straight six harness uses to plug into the main harness that hooks into the dash. is the main harness that same on all truck models? Like will i be able to just unplug the straight six harness and computer and plug the 351 harness and computer right in? Thanks alot.
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Fleet Owner
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From: Kentucky
For some reason it look like the code is not on there unless the EOD code listed is a typo and it was meant to be E9D. If that is the case i would have to go get a computer off of a manual truck correct? I also have another question. The connectors that came with teh 351 look to be exactly the same as the ones the straight six harness uses to plug into the main harness that hooks into the dash. is the main harness that same on all truck models? Like will i be able to just unplug the straight six harness and computer and plug the 351 harness and computer right in? Thanks alot.
I have no experience with an I6 to V8 swap so I cannot answer the wiring harness question.
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From: Ottawa, Ontario
If the two engines you're swapping are the exact same year then it's possible the wiring harnesses are the same or very similar... may be a few pins in different locations but connectors the same, but if they're different years there is no guarantee they're pinned the same or even use the same connectors.
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If the two engines you're swapping are the exact same year then it's possible the wiring harnesses are the same or very similar... may be a few pins in different locations but connectors the same, but if they're different years there is no guarantee they're pinned the same or even use the same connectors.
As far as the PCM goes you actually have more latitude there then you have with harnesses. I'm using the one from the '93 on my '91 without issue. Typically you can use an automatic PCM on a manual vehicle, but not vice-versa. Ideally though, best to get one that most closely matches your drive-train setup.
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yeah i am hoping that the wires on the chassis harness are the same for the i6 as the v8. i actually dont know what year the harness that came with teh motor is from but the connectors look to be exactly the same. There are four or so plugs that plug into what i am calling the "chassis Harness" which in turn plugs into the eec and the round connector through the firewall. i wasnt sure if these were universal or not. Ill try plugging the harness into it on sunday and hopefully it works. when i go back to the junk yard hopefully the truck the motor came out of still has the "chassis Harness" and ill take that and compare it to the one in my truck. I just dont wanna get the motor in and have to take more days off work because the thing wont run so im trying to do all of the research i can so i know eexactly what parts i need and what to do when the time comes. Thanks for your help and if anyone else has any input im open to all suggestions. 
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From: New York
yeah i am hoping that the wires on the chassis harness are the same for the i6 as the v8. i actually dont know what year the harness that came with teh motor is from but the connectors look to be exactly the same. There are four or so plugs that plug into what i am calling the "chassis Harness" which in turn plugs into the eec and the round connector through the firewall.
I suspect that '87 - '91 I6/V8 may be interchangeable, or nearly so. But that is just a barely-educated guess, so verify.
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