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Topic: Changing fuel injection to a carberated set up?

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Seddie
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Changing fuel injection to a carberated set up?
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I have a 87 XJ Pioneer with the 4.0 fuel injected engine that has some wiring issues and was wondering if I could just eliminate all the wiring by changing over to a carb set up.

 

I know it would require a different intake a carb and a MSD like box. Will I need a different distributer as well? Will i have any problems with the transmission shifting? (It will likely never be shifted into overdrive again)

 

This jeep has alot of life left in it I just want it to run to have some more fun in the trails. Any help would be appriciated even if its not worth it I will have learned something

  



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aci4369
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I don't know the answer to your question... 

 

But, if you are having problems with both the engine and Transmission, why not go to a Junk Yard and get new one?  

How much money are you going to have in buying new Dist., Carb., etc...

You might have close to the same amount in the end and less headache.  You will learn a ton as well buy pulling and swaping the engine and tranny.  And if you stay around the same year it should be fairly simple.



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ChevelleSSLS6
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I think retrofitting a carb setup would be interesting... or even an aftermarket fuel injection system (Howell EFI supposedly makes kits for the 258...) and I think the tunability of the aftermarket units may be useful.

Some guys swap GM tbi systems... supposedly they're simple as dirt. I think the throttle body for the 4.3v6 and the 305 v8 is the same, but the 350 gets a larger one (too large for our XJs in my opinion).

While a build like that would be awesome, like ACI said- it may be less trouble and expense to run with the factory stuff.

Matt

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slvmart
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Howell was essentially responsible for the Chrysler EFI kit for the 258 (4.2L). As far as I know, they still provide replacement parts for that kit, or you can get a new setup directly from them. (Anyway if memory serves me correctly.) I have installed one of the Chrysler kits on my CJ8, although that project is still not on the road, as I only have the chassis about 75% ready.

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Steve Martinek
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Seddie
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Thanks for the info. The main problem is the main engine wiring harness has grounded and shorted out. Im having trouble finding a replacement harness and the idea came up.

Ive already have the carb and intake setup (from a friend). Ive done some reseatch about the tranny and it is controlled by the TCM. In the process I also found a diagram to basically hot wire the tcm wires to a rotary switch that will shift the tranny manually.

how does this sound?



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slvmart
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Have you seen these ?
http://radesignsproducts.com/RockShifter.aspx
http://www.stu-offroad.com/engine/aw4/index.htm
replacement or repair of TCM : http://www.autocomputersystems.com/TCU_finditfast/details.php?showrnrattop=

Other than that I have not run across anyone who sells replacement harnesses. But you should be able to get a used one out of another XJ, or maybe even a Jeep dealer.

The biggest issue with the rotary switch, if you do not run the TCM, will probably be that you will be manually shifting, with the rotary switch, 100 % of the time. That may be OK, offroad, but it you use it as a DD it may get old real quick.

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Steve Martinek
SW Michigan.

2000 XJ Sport 
2005 F350 6.0L Crew Cab
1983 CJ8 - frame off in (slow) progress
1967 Mustang Fastback - future project - waiting for CJ8 to get done
 
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