I recently purchased a sandrail that had a junk 2.9 in it. Because I've read on here that the 4.0 swap is so easy, I went that route.
I bought a complete 94 Explorer with a weak tranny for $200.00

I pulled the ECM and wire harness out of the explorer to use on the sandrail.
My questions are:
1. Can I just unhook all the egr stuff?
2. Are all the harness connectors by the fuel rail necessary to operate? Only one connector was on the engine harness and the other 2 go to the body/frame harness.
3. Would it be easier to adapt an old GM alternator, or will the ford work with a stripped down harness.
4. Which wires out of the ECM are essential for this thing to run?
5. Can the O2 sensors be eliminated since i'm not into emissions anymore?

If anyone can point me in the directions of a wiring schematic, I may be able to pick my way through it.

Thanks for any help.

 

You will always need two O2 sensors otherwise it will run in safe mode. It will run rich.
If it were me I would unplug anything that seemed unnecessary(one at a time) and run it, smell the exhaust and see if it smells different then if did not make a difference I would toss it.

Ford Alternator will work just need to have a voltage feed back direct at the alternator instead of going to the instrument cluster then back.
This explains it for mustangs but I found it to be pretty universal of Ford alternator requirements:
Florida 5.0 - Frequently Asked Questions <--- look at the 2nd question answer.