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post #1 of (permalink) Old 11-21-2002, 12:43 PM
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question on efi swap

Im looking to buy a 4l head to put on my 83 cj. I found a head but i can also get the fuel injection setup that it was on the jeep. It comes out of an 89 cherokee with the 4l. i can get the head, valve cover, intake and exhaust, injectors, wiring harness, and the computer. would it be possible to use this fuel injection on my jeep? and if so, what kind of modifications would i have to make to get it to work?
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post #2 of (permalink) Old 11-21-2002, 12:56 PM
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Re: question on efi swap

I'd say do a search on 4.0 EFI Swap to see what is needed.

There are at least two things that come to mind.

#1 the Speed Sensor on the Bellhousing
#2 The O2 Sensors.

Both are needed by the computer to figure out how much fuel/air is needed to run the engine.

You'd be better off replacing the whole enchilada.

Good luck!
post #3 of (permalink) Old 11-21-2002, 01:21 PM
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Re: question on efi swap

You probably want a 91-newer head and setup. I think the older 4.0s had a "Renix"(?) setup that I don't think was as desirable. Whatever it's called, it is significant difference in the design.
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post #4 of (permalink) Old 11-21-2002, 02:49 PM
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Re: question on efi swap

Yes, defintiley go for 91 or newer. There is a ton of info out there about the swap. I swaped the whole 4.0L but can offer some advice if needed.
post #5 of (permalink) Old 11-21-2002, 04:00 PM
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Re: question on efi swap

91 and newer is the only way to go I purchased a 89 4.0 and that was a waste of money. Also i have researched this and I wouldn't buy anything newer than a 99 either.. Here is a website for you to purchase a complete 4.0 engine and swap "kit" for around $1500. call and talk to steve..

Good luck...
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post #6 of (permalink) Old 11-21-2002, 06:32 PM
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Re: question on efi swap

I would get the whole setup, all sensors and everthing i need to make it work. Becuase i would need to machine the head anyway, would it be possible and reasonable to just machine it so that i get better performance? Thank you for all the info so far.
post #7 of (permalink) Old 11-21-2002, 06:39 PM
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Re: question on efi swap

No. The reason the '91 and newer are better is because of the angle of the ports that allow air/fuel into and exhaust out of the cylinder. They are a more gradual curve instead of a 90* angle like '90 and older. Total waste of money. Get a '91-95 with all the fixins. You can run a '96-02 head, but you will need the newer intake and exhaust manifolds and to simplify things you will still have to run '91-95 injectors and electronics.
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