90 MJ 4.0 fit in my 96 xj?
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Model: Cherokee
90 MJ 4.0 fit in my 96 xj?
my motor is dying quickly in my 96 xj, my FIL has a 1990MJ 4.0 with 122000 that he said i can have, would reaaly be great if i could use this engine, money is kinda tite rite now and this would be a huge blessing, i am pretty confident i can do the removal and reinstall myself, with maybe a couple extra hands for the critical moments. just need to know if this will work. what if anything will i have to swap over, i was thinking while i have it out putting some cheap exhaustheader on it, they are more then likey cracked somewhere, like so many others. i have been searching but canot find my exact situation, any links to this kinda stuff would be great too thanks guys!!
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its dying noises and such i am putting a new to me in thats def set in stone just wondering about this swap. and yes the mj motor runs its out of the mj right now though. what other things are diff?
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also tossed around the idea of turning this xj into a manual cause i could use his tranny too, but seems like a lot of work and this is a DD so i gotta get it up and running soon. i dont mean to be annoying with wat seem like stupid questions to u so if there is any links u know of ill go there too, i have been searching
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#8
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Year: 1987
Engine: Check
Well, first off your XJ is OBD, the MJ is Renix. Compmetely different operating system.
Then the all the little things. For example the manual throttle position sensor vs the auto one. Not sure if the are the same for the Renix auto vs the OBD auto, so not sure if you can use your original.
Seems like the better idea would be to find one closer to your year.
Then the all the little things. For example the manual throttle position sensor vs the auto one. Not sure if the are the same for the Renix auto vs the OBD auto, so not sure if you can use your original.
Seems like the better idea would be to find one closer to your year.
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Easy to do. No big deal on the fueling systems. Keep yours.
Use your dizzy, flexplate, sensors and manifolds. Use an intake/exhaust gasket for the later model engine. Any questions, post them up or PM me. I've done a coupla Renix/HO swaps. Think of it as a long-block swap and it's easy.
Use your dizzy, flexplate, sensors and manifolds. Use an intake/exhaust gasket for the later model engine. Any questions, post them up or PM me. I've done a coupla Renix/HO swaps. Think of it as a long-block swap and it's easy.
Last edited by cruiser54; 03-25-2012 at 09:02 AM.
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ok im concerned now about the 2 different responses i am getting, if you have done an actual renix motor into a newer model then i would definately love your input and help, wat is a dizzy? so i need a manifold gasket like for my 96? it will bolt right up though at least right? what is ur take on the throttle sensor thing? does anything need to be modded or fabbed up in order for it to fit? thank u so much bro!!
#11
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
ok im concerned now about the 2 different responses i am getting, if you have done an actual renix motor into a newer model then i would definately love your input and help, wat is a dizzy? so i need a manifold gasket like for my 96? it will bolt right up though at least right? what is ur take on the throttle sensor thing? does anything need to be modded or fabbed up in order for it to fit? thank u so much bro!!
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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Year: 1996
Model: Cherokee
Engine: 4.0L High Output OBDII
I suppose not, but that's alot of crossing over years to get the correct sensors where needed. I remember my 95 had one type of coolant sensor, my late 96 (with a factory 97 motor) has a different sensor then an early production obdII 96, and my renix didn't even have one. I know its a poor example, I just get tired of trying to match stuff up sometimes I suppose.
Again, I suppose if you take it in the light as mentioned, as a long block swap, wouldn't be too awful of a headache.
Again, I suppose if you take it in the light as mentioned, as a long block swap, wouldn't be too awful of a headache.
#15
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I suppose not, but that's alot of crossing over years to get the correct sensors where needed. I remember my 95 had one type of coolant sensor, my late 96 (with a factory 97 motor) has a different sensor then an early production obdII 96, and my renix didn't even have one. I know its a poor example, I just get tired of trying to match stuff up sometimes I suppose.
Again, I suppose if you take it in the light as mentioned, as a long block swap, wouldn't be too awful of a headache.
Again, I suppose if you take it in the light as mentioned, as a long block swap, wouldn't be too awful of a headache.
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