89 efi 460 carb conversion wiring???
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89 efi 460 carb conversion wiring???
hello, i am working on swapping a 1989 460 efi/ZF5 combo that came out of a f250 into and 91' f150 and i am converting it to carb, i have an adapter plate, injector ports plugged and all that fun stuff, what i am wondering is the wiring to the distributor, i am looking for the bare minimum to keep it running, i have deleted the egr and AC so all i need to know is what can i cut out of the wiring harness to make it clean and what sensors i can pull out of the manifold. this is a low budget swap and want to buy as few parts as possible. let me know what you guys think, john
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Joined: Jun 2006
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From: Ottawa, Ontario
You need a different distributor as the EFI version has no provision for mechanical or vacuum advance, and then you need an ignition system that will work with whatever distributor you get. Then you need a bypass regulator to bring fuel pressure and volume down to something a carb can handle.
Fleet Mechanic
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From: Saskatchewan Canada
Also, your fuel system will need much more modification than just a bypass regulator.
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Run two ninety degree elbows back to the fuel return. Come off of that with 6psi along the way. Never did it but seen it done. Don't remember any more than that. Use a gauge to check it.
I hope this is not intended to be a safe and reliable vehicle used on public roads. It ain't.
Your 460 is going to be detonation prone. Don't ignore it or it will eat itself from the inside out.
Get a wiring diagram for a Ford gas tractor with an alternator and use that. Or an old Thunderbird.
I hope this is not intended to be a safe and reliable vehicle used on public roads. It ain't.
Your 460 is going to be detonation prone. Don't ignore it or it will eat itself from the inside out.
Get a wiring diagram for a Ford gas tractor with an alternator and use that. Or an old Thunderbird.
Fleet Mechanic
Joined: Mar 2014
Posts: 1,926
Likes: 116
From: Saskatchewan Canada
Run two ninety degree elbows back to the fuel return. Come off of that with 6psi along the way. Never did it but seen it done. Don't remember any more than that. Use a gauge to check it.
I hope this is not intended to be a safe and reliable vehicle used on public roads. It ain't.
Your 460 is going to be detonation prone. Don't ignore it or it will eat itself from the inside out.
Get a wiring diagram for a Ford gas tractor with an alternator and use that. Or an old Thunderbird.
I hope this is not intended to be a safe and reliable vehicle used on public roads. It ain't.
Your 460 is going to be detonation prone. Don't ignore it or it will eat itself from the inside out.
Get a wiring diagram for a Ford gas tractor with an alternator and use that. Or an old Thunderbird.
Everything else I'll agree 100%.
To the OP, this notion of carb conversion comes up probably a few times a week and is almost always a bad idea and certainly not cheap. Spend a little time searching. I have expressed my own opinion more times than I care to count. The only time I think it would be feasable would be on a highly modified engine that required more flow than the stock EFI was calibrated for. Even then, there are ways to recalibrate EFI. On a stock engine, the carburetor is a step backwards in performance and reliability. There will be other opinions, but I stand by mine.
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I see these threads as "dancing at the junkyard door". A truck fell in someone's lap who doesn't want learn and can't afford to fix it right. I'm not interested in detailing the low pressure thing but I will say that just because you doesn't understand it doesn't mean it doesn't work.
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Fleet Mechanic
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From: Saskatchewan Canada
"dancing at the junkyard door"
I love it! Was looking for a nice way to say that.
Funny thing is, while I have seen this carb swap question so many times, I have never seen a response claiming a success. I wonder how many of these carb swaps have made it onto the road and even then, how many saw any amount of service? Probably more than a few nice trucks scrapped because of this.
I love it! Was looking for a nice way to say that.
Funny thing is, while I have seen this carb swap question so many times, I have never seen a response claiming a success. I wonder how many of these carb swaps have made it onto the road and even then, how many saw any amount of service? Probably more than a few nice trucks scrapped because of this.
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From: Ottawa, Ontario
The ironic thing is it would be easier to keep the EFI system. It is possible the 7.5 engine wiring harness would plug right into the chassis harness on the '91, if not then a '91 engine harness would be necessary, but other than that the only thing needed would be a 7.5 PCM and that would plug right in and work.
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