If I have a complete 4.0 can i do an MPI swap with the parts? - JeepForum.com
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post #1 of 3 Old 02-11-2009, 01:39 PM Thread Starter
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If I have a complete 4.0 can i do an MPI swap with the parts?

I am just about to embark on an engine swap and think I have read everything on the internet pertaining to it... and my head is mush. Anyway, I have a complete 99 4.0 and wanted to know if i could just do the MPI swap on the existing 4.2? basically removing all the fuel injection parts from the 4.0 and moving them over? I have read a lot on the head swap and staying with a carb [dont want to do that at all] then when they go into the MPI they always talk about the kits...?

Is this doable? does anyone have a link of someone who's done this?


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post #2 of 3 Old 02-11-2009, 02:42 PM
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You might try posting on CJoffroad.com there's a whole section devoted to it and many questions regarding the 4.2
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post #3 of 3 Old 02-11-2009, 02:54 PM
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If the 4.0 manifold bolts up to the 4.2 head which it should you should be able to but its a 40 hp gain using the 4.0 head alone. If you have it I would use it, it really wont be that much more work to pull the head when you have it stripped down that far already plus you get a new head gasket so thats one less thing to worry about later.
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