EFI to Carb
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Laughing Gas
Joined: Nov 2000
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From: tulsa
EFI to Carb
Here is the deal, I have an 85 bronco that I just put a motor in and I took it out of an 86 bronco for a friend (he told me the 85 was EFI). Any way the 85 is not. I feel that wiring the bronco to EFI might be over my head, or take me a long time. So what would I need to convert to a carb. I know intake and carb, will I need to change the distributor, or can I use the stock. The stock has about 8 wires coming out of it. Which ones should I use. I will need to run an electric fuel pump. But I have the intake, an older street dominator intake from holly, will it fit this 86 motor. Should I try to make the EFI work before I convert. If so I need some pointers in getting started. I have been told only about 7 or 8 wires are needed to make the motor run but I have no clue which ones. And I have been told it is almost impossable to do. All info on this subject will be helpful.
Senior User
Joined: May 2003
Posts: 135
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From: Florida
Id say there be little or no sane way to keep it EFI.........I am sure you need to replace timing cover as well for some odd reason but it should be "cake"...other then that.. if you go carb....If u try EFI when the 85 isnt set up for it, you'll just go nutz and have a truck that dont run...
But there are alternate fuel injection systems but they are quite expensive...
But there are alternate fuel injection systems but they are quite expensive...
Postmaster
Joined: Jun 2001
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The carb intake (street dominator) if its for your engine ci then it'll fit.
You need to use the carb distributor, the tfi or efi distributor won't work.
Install the carb and intake, install the carb distributor and if I have this right your truck is carbed and the engines are the same ci, so just use your distributor and hook it back up to the coil and module as it was before. Get a low psi electric pump for carburetors, carter is an example, run the fuel line to the carb and you should be good to go, once timing is set. Good luck
You need to use the carb distributor, the tfi or efi distributor won't work.
Install the carb and intake, install the carb distributor and if I have this right your truck is carbed and the engines are the same ci, so just use your distributor and hook it back up to the coil and module as it was before. Get a low psi electric pump for carburetors, carter is an example, run the fuel line to the carb and you should be good to go, once timing is set. Good luck
Postmaster
Joined: Jun 2001
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With his truck being carbed he shouldn't have a high pressure efi pump now. The problem is the timing cover on the efi doesn't have a fuel pump boss for the mechanical pump, so instead of changing everything off the front of the engine from the timing cover forward, it would be easier to just install an electronic low pressure fuel pump inline were the existing mechanical used to be, the tank selector would work as ususal because the fuel pump would be after the selector, no need to install the pump in the fuel tank. Plus he can have a serpentine belts system as opposed to the v belt, if that matters. Later
Senior User
Joined: May 2003
Posts: 135
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From: Florida
There u go there was a reason for the timing cover and now a way around it.....
so it be much easier making it carbed then doin Efi(pain in the wazoo)
Dont forget about the college education u need a as well to go EFI as well..
so it be much easier making it carbed then doin Efi(pain in the wazoo)
Dont forget about the college education u need a as well to go EFI as well..
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Laughing Gas
Joined: Nov 2000
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From: tulsa
Thanks for the info, I'm planning on running the holley fuel pump so that i don't need the regulator. One last question, what about the alternator. Is the regulator built into the alternator, is so I belive that I can just hook up one wire to the batterie and get away with it.
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Postmaster
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According to what I found, there are two different alternator housing for the 85 carbed motor and 86 efi motor. You will have a 6 1/2" or 5 1/4" housing, in either case the replacement alternators are the same for each specific housing, so from what I can tell you should be able to plug in your existing alternator harness to the efi alternator, but you should check the electrical section of this website to be 100%. Good luck
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