4.9 efi swap
Hotshot
Joined: Jun 2015
Posts: 12,811
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Since the 300 in an ‘86 should be fuel injected, that would be against everything I’ve heard about using the donor engine’s wiring in another vehicle. I’d think all you need to do is swap out the long block out of the ‘92 and put it in the ‘86.
Senior User
Joined: Sep 2008
Posts: 287
Likes: 1
From: SE WI
The 300 didn't get EFI until 1987. 302s had EFI in 85, I want to say.
It would be a lot of work to retrofit everything into the 86.
How wrecked is the 92? The front clip of the 86 should almost bolt up to the 92 truck, with the exception of the lower fender bolt. Boxes should interchange, tailgates are different.
It would be a lot of work to retrofit everything into the 86.
How wrecked is the 92? The front clip of the 86 should almost bolt up to the 92 truck, with the exception of the lower fender bolt. Boxes should interchange, tailgates are different.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
Also when you swap out the fuel tanks for the EFI ones, the fuel gauge will read backwards with the 92's tank. Ford changed how the sending units operate from 86 to 92 and I found out the hard way when I did the EFI swap on my 84 F250.
It is NOT a plug and play setup, I had to make up a custom ECU EFI harness to add to the 84 truck. Then swap fuel tanks only to find the nasty fuel gauge issue!! Had to do some creative engineering of putting the 84's sending unit into the newer year tanks. It ran for over 10 years till I got a Oppy DP intake and went back to carb/DSII!
It is NOT a plug and play setup, I had to make up a custom ECU EFI harness to add to the 84 truck. Then swap fuel tanks only to find the nasty fuel gauge issue!! Had to do some creative engineering of putting the 84's sending unit into the newer year tanks. It ran for over 10 years till I got a Oppy DP intake and went back to carb/DSII!
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