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post #1 of 9 Old 03-17-2020, 07:59 PM Thread Starter
jeepin4
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YJ PCM question

Hi all. I have a question that is a little complicated. I have a 91 YJ that originally came with a 2.5L. When I blew that motor I swapped in a 97 XJ 4.0 motor with the harness, PCM, and remaining parts from a 93 YJ. I am starting to have issues with the PCM and need to swap it for another. So, my question is what years 4.0L PCM can I swap in? Obviously another 93 would work, but any other years?

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post #2 of 9 Old 03-17-2020, 08:23 PM
ThomasYJ
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hell you can have my PCM. 93 4.0 manual trans.

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post #3 of 9 Old 03-17-2020, 08:37 PM
ThomasYJ
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but maybe more appropriately, what PCM issues are you having?

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post #4 of 9 Old 03-17-2020, 08:51 PM Thread Starter
jeepin4
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I’m having a starting issue. PCM is not powering up the fuel pump. Turn ignition in the on position and no lights on dash, and no fuel pump prime. Engage the starter and it just cranks and cranks. From everything I’ve found online, something in the PCM goes bad and creates all the symptoms of what’s happening.
I am looking for a 4.0 manual PCM. Where are you located?
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post #5 of 9 Old 03-17-2020, 08:55 PM Thread Starter
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post #6 of 9 Old 03-17-2020, 08:57 PM
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Quote:
Originally Posted by jeepin4 View Post
Iím having a starting issue. PCM is not powering up the fuel pump. Turn ignition in the on position and no lights on dash, and no fuel pump prime. Engage the starter and it just cranks and cranks. From everything Iíve found online, something in the PCM goes bad and creates all the symptoms of whatís happening.
I am looking for a 4.0 manual PCM. Where are you located?
I'm in Washington. If you want it, whatever the shipping cost is and it's yours, I'm doin a V8 swap and have no use for it. Got a bunch of other 4.0 stuff that needs a good home too Airaid intake, 99 manifold, silicone rad hoses etc etc

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post #7 of 9 Old 03-17-2020, 09:07 PM Thread Starter
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That would be great. I appreciate that. I’ll PM you and we can work out the details. Thanks!
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post #8 of 9 Old 03-18-2020, 10:54 AM
Siva283
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I have a 95 4.0 computer that would work if you are OBD1. If you used the newer 97 obd2 computer you will need one of those. The harness is way different between obd1 and obd2

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. It started with a $200 axle, and a few thousand dollars later I was done :)
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diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #9 of 9 Old 03-18-2020, 03:18 PM
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If you're getting one for free great, if not then fix yours.

See here... https://www.jeepforum.com/forum/f12/...rs-ecu-492597/

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