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  #1  
Old December 3rd, 2007, 07:03
ksmithers88 ksmithers88 is offline
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Location: Jax, FL
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engine swapping

so my new xj has the baby 2.5L I4, and once i get a few paychecks built up, i'll be on the market for a crate engine. My question is this:

If i go with the jeep 4.0 (or 4.7 stroker) what will i need to purchase in addition to the actual engine to make sure all the pieces fit? I've seen sites advertising "rebuilt" and "replacement" 4.0's, but do i need to have had the I6 originally for these? I'm pretty much set on this engine, as they are bulletproof and run a damn long time.

Also, does the 2000 base model with the I4 have the np231 tc?
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Old December 3rd, 2007, 08:11
BIGSLVRXJ BIGSLVRXJ is offline
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Re: engine swapping

Quote:
Originally Posted by ksmithers88
so my new xj has the baby 2.5L I4, and once i get a few paychecks built up, i'll be on the market for a crate engine. My question is this:

If i go with the jeep 4.0 (or 4.7 stroker) what will i need to purchase in addition to the actual engine to make sure all the pieces fit? I've seen sites advertising "rebuilt" and "replacement" 4.0's, but do i need to have had the I6 originally for these? I'm pretty much set on this engine, as they are bulletproof and run a damn long time.

Also, does the 2000 base model with the I4 have the np231 tc?
I'll go off the guess that this is the 2000 since that's what you mention at the bottom of your paragraph. You will need the complete engine wiring harness and PCM from a 97+ XJ that had a 4.0L. You can use a rebuilt 4.0L just fine, I would request one from a 96-99 model year though if you're going that route, I think the vin is "S". You're correct in the fact that they're bulletproof and for that reason I would get one from a 97-99 XJ at a junkyard if you can find one. Often times there are still low mileage units out there. Your 2000 2.5L would probably have an NV-231 yes. Coincidentally, if you do this swap, could I buy your 4 cylinder engine wiring off of you if you do truly have a 97+ 2.5L?
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  #3  
Old December 7th, 2007, 03:50
ksmithers88 ksmithers88 is offline
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Re: engine swapping

PCM?
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  #4  
Old December 7th, 2007, 06:09
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JNickel101 JNickel101 is offline
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Re: engine swapping

PCM - Powertrain Control Module - the engine computer basically....
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  #5  
Old December 7th, 2007, 07:05
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90Blue_XJ 90Blue_XJ is offline
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Re: engine swapping

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Originally Posted by JNickel101
PCM - Powertrain Control Module - the engine computer basically....
Not cheap unless you find a JY one. Several hunnerd clams, but can't do the swap w/o it.
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