I have a 1991 F150 with a 5.8 and a auto trans!
It needs to completely rewired but I was thinking
of going carb and lose the EFI. I'm getting a Painless
18 cir. harness from Painless. I want to lose the computer
and everything related to it and run the truck with an old
school kind of wiring setup and maybe a aftermarket
electronic ignition (MSD, Mallory, etc.) also no cats! Inspection
is not a problem because of the age of the truck, in Texas you
can license it as a classic car and that means no state inspection!

Has anyone done this and can it be done?

 

Anything can be done wiring wise. I rewired a 92 F150 engine bay harness into my 89 F250.

The only thing that will be a issue is if you have the E4OD transmission. Its a ECU controlled tranny which needs all of the EFI system to work. There are stand alone tranny controllers but cost $$$. If you have a manual or C6/AOD automatic , then no problems going back to carb.

 

I suppose. But the inevitable question: Why?

 

Sounds like a plan. As Eddiec1564 said, if you have an E4OD transmission then it needs the computer and EFI system to be working properly. If you've got a manual or non computer-controlled automatic then you're good to go.

Wiring for a carb setup is ridiculously easy. Run a Ford Duraspark 2 system, and all you'll have are 3 wires coming off of the distributor harness to the Duraspark box and a ground wire coming off of the box to your coil (negative side of coil which makes it fire). Plus a "key on" power wire to your coil, and maybe a wire to an electric choke on your carb (if you prefer electric choke over manual). That's a grand total of 6 wires to run the setup.

 

Thanks, Guys!
So I have to get rid of the E40D tranny and go with a C6-AOD!
Has anyone had a problem with installing a carb and intake on
a EFI motor when you get rid of the smog stuff and other sensors
related to the EFI and computer?

 

Assuming the install is done correctly an EFI motor will run just fine on a carb.