NEED HELP!!!
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1st Gear
Joined: Apr 2025
Posts: 1
Likes: 0
NEED HELP!!!
I've got a 1990 f250 with a 7.5 and am attempting to convert it to carb from efi by taking the intake manifold from a carbureted 460 in a 86 motorhome and swapping it with my efi intake manifold.
I just want to make sure I'm doing it correctly and so far the only thing that I'm having an issue with is a small difference in the shape of intake ports.
As for transmission control, can I take the "sensor/kickdown" off the motor home as well ?
It seem like it is pretty much identical minus wire harness on the 1990.
Also. Can I now remove ecm and wire harn
I just want to make sure I'm doing it correctly and so far the only thing that I'm having an issue with is a small difference in the shape of intake ports.
As for transmission control, can I take the "sensor/kickdown" off the motor home as well ?
It seem like it is pretty much identical minus wire harness on the 1990.
Also. Can I now remove ecm and wire harn
Logistics Pro
Joined: Nov 2013
Posts: 3,922
Likes: 1,191
From: Mojave, Ca
Does your truck have the c6 or E4OD transmission? The motorhome has a c6 which is a '60s era 3 speed mechanical transmission. Your truck probably has the 4 speed electronic E4OD transmission introduced in 1988. Two different animals. You'll still need to run the ECU in your truck to operate the transmission. That means you'll need the throttle position sensor and distributor for the rpm signal. Not the easiest thing to graft onto your carburator.
Have you considered just repairing your efi setup and not modifying the engine?
Have you considered just repairing your efi setup and not modifying the engine?
Hotshot
Joined: Jun 2015
Posts: 12,780
Likes: 2,422
I've got a 1990 f250 with a 7.5 and am attempting to convert it to carb from efi by taking the intake manifold from a carbureted 460 in a 86 motorhome and swapping it with my efi intake manifold.
I just want to make sure I'm doing it correctly and so far the only thing that I'm having an issue with is a small difference in the shape of intake ports.
As for transmission control, can I take the "sensor/kickdown" off the motor home as well ?
It seem like it is pretty much identical minus wire harness on the 1990.
Also. Can I now remove ecm and wire harn
I just want to make sure I'm doing it correctly and so far the only thing that I'm having an issue with is a small difference in the shape of intake ports.
As for transmission control, can I take the "sensor/kickdown" off the motor home as well ?
It seem like it is pretty much identical minus wire harness on the 1990.
Also. Can I now remove ecm and wire harn
What are your plans for the ignition and fuel systems?
Does the truck have an overdrive cancel switch on the dashboard? What about the motor home? Does it have a cancel button?
Does your truck have the c6 or E4OD transmission? The motorhome has a c6 which is a '60s era 3 speed mechanical transmission. Your truck probably has the 4 speed electronic E4OD transmission introduced in 1989. Two different animals. You'll still need to run the ECU in your truck to operate the transmission. That means you'll need the throttle position sensor and distributor for the rpm signal. Not the easiest thing to graft onto your carburator.
Have you considered just repairing your efi setup and not modifying the engine?
Have you considered just repairing your efi setup and not modifying the engine?
Absolutely. I would fight my way through diagnosing and repairing EFI.
Hotshot
Joined: Jul 2020
Posts: 10,315
Likes: 2,579
From: Near Salt Lake City
It's basically impossible without swapping heads
Never say never, but time is money
The intake ports do not match
Not sure about the exhaust ports, but the intake ports are a deal breaker for a 1986 engine swap to EFI
Never say never, but time is money
The intake ports do not match
Not sure about the exhaust ports, but the intake ports are a deal breaker for a 1986 engine swap to EFI
FTE Chapter Leader
Joined: May 2006
Posts: 12,319
Likes: 1,298
From: Central Mississippi
The carb solution to EFI intake is here:
https://www.pricemotorsport.com/
Click on carb adaptors.
Everything else is on your own.
I'd fix the EFI.
https://www.pricemotorsport.com/
Click on carb adaptors.
Everything else is on your own.
I'd fix the EFI.
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