Hydrolocked....new engine time - JeepForum.com
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post #1 of 6 Old 09-22-2004, 08:43 PM Thread Starter
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Hydrolocked....new engine time

Well, after ripping apart my friends 1990 2.5L engine, I disocvered bent rods and valves, We are going to swap in a junkyard 2.5L into it, this should be an easy swap correct? it's the same motor and all so I just should be able to disconnect the dead engine and swap in the other one, hook it up and go ?

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post #2 of 6 Old 09-23-2004, 06:41 AM
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I don't see why not.

Just make sure to get a motor with the same fuel injection system, as there were 2 different ones, I believe.

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post #3 of 6 Old 09-23-2004, 07:45 AM
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I think the 90 2.5 might be throttle body injection, but my 92 is a multi port injection.

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post #4 of 6 Old 09-23-2004, 08:22 AM
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if yuou get an engine that in not an 89-90 you will have to switch over the intake manifold and valve cover and maybe the distributor. but the block and everything else should be the same.

wait i take that back you will also have to switch the sensors because after 91 they switch to a obdII system.
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post #5 of 6 Old 09-23-2004, 06:07 PM
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I thought OBD-II didn't come 'til much later? Like mid-90s if YJs were equipped at all... I mean my YJ is carb'd so I'll admit I'm no expert on ECUs, but I thought that's what I heard.

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post #6 of 6 Old 09-23-2004, 10:25 PM
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OBD II is 96 and newer. make sure the 2.5L you get is 87-90 b/c they are TBI. 91-95 are MPI OBD I

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