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CromeY
01-24-2010, 09:16 PM
k before you all flame on me i just searched for a hour and a half looked threw all the threads and didn't find out what i wanted so the question is i got given a 90 xj cant get it to run tried a bunch of stuff think the motor is blown so i am gonna buy a rebuilt 89 engine so for the swap what do i need to keep and what do i need to change as in i kno the gauges are different like the 89 is idiot light and the 90 isnt so i kno i need to change the sensors but what else do i need to change the computer or anything else or is it pretty much a bolt in swap? also can i keep my cruise and ac or are they different between the two years? any thing else would be greatly appreciated as because i am starting the swap next weekend and i dont wanna swap it in and forget to do something and have it still not run thanks in advance

WagoneerXJ
01-31-2010, 10:09 AM
The engines are the same. 87-90 4.0's use the "renix" injection system. After that they were alot different. Just swap on your gauge senders and it's a direct swap.

Figured out why the 90 engine won't run?

CromeY
01-31-2010, 12:28 PM
dont kno why but it has low compression across the whole board im talking 90 in 2,3,4,5,6 cylinders and 60 in 1 so not sure but we ahve fuel and spark so im stumped and just gonna swap it wish i could figure out the exact problem

Zukibuggy
01-31-2010, 02:01 PM
dont kno why but it has low compression across the whole board im talking 90 in 2,3,4,5,6 cylinders and 60 in 1 so not sure but we ahve fuel and spark so im stumped and just gonna swap it wish i could figure out the exact problem
sounds like broken piston rings or oblonged cylinders

CromeY
01-31-2010, 03:16 PM
yea just weird its across the board

bcmaxx
02-02-2010, 02:41 PM
Have any luck with this?

CromeY
02-02-2010, 04:38 PM
doing the engine swap this weekend