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Old 10-20-2013, 01:15 PM   #1
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2.4 to 4.0 swap help needed

I purchased a 95 yj 4 banger with no motor, tranny, or transfer. I picked up an 1990 4.0 motor, tranny and transfer for a good price. I have both sets of wires and computer from the 95 and the 90. The new motor and all is in and mounted, this is where my issue begins. .. wiring from a 2.5 fuel injection to a 4.0 carburated. Any help would be greatly appreciated.

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Old 10-22-2013, 11:40 AM   #2
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wiring

b-level, If i understand what your saying you have the wiring harness for both? If so use the 90 computer and wiring this should be pretty much plug and play.

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Old 10-22-2013, 11:44 AM   #3
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wiring

If not another option would be use the 90 computer. You can get a schamatic that shows what each pin is for this will give you the wires for the sensors on the carb and air etc...
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Old 10-22-2013, 11:58 AM   #4
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I considered that first until I found that the computer on the 95 mounted under the hood with 2 wire clusters that pass through the firewall and the 90 computer mounts behind the glove box inside the cab, and are the only wires passing through the firewall. What stumps me is what would the 95's plugs under the dash plug/splice into if the computer wires are the only ones passing through the firewall? I'm seriously considering a wiring kit from ezwiring.com and just bypassing the computers and sensors altogether. Your opinion?
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Old 11-11-2013, 08:08 AM   #5
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You may want to check the motor mount spacing difference between the two engines. ... but with a welder and some fab skills you should be fine.
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Old 11-15-2013, 01:27 PM   #6
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Ok, so the motor is in and everything is bolted down. In an attempt to "simplify" things I decided to order a wiring kit from EZ Wiring and redo everything. ... I know, probably not the best decision. Here's my latest snag, I am having a hard time finding out what wires are what behind the dash. Mainly the intermittent wiper module and the thin plug that says pack-con on it. The EZ Wiring wires say on the wire what they are for but I cant find a diagram to pick out the steering column wires to match them up. For instance, the intermittent wiper module has 7 wires going into the box from the column and on the wires from EZ there is only 1 wire printed "wiper power". Any idea where I can find details diagrams for the column wires? On a positive note, my new dash has been cut and folded and I'll be finishing drilling the holes tonight and mounting the new gauges.

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