2.5 to 4.2 swap.. need info - Page 3 - JeepForum.com

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post #31 of 39 Old 03-15-2013, 04:16 PM
Que89YJ
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1989 YJ Wrangler 
 
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What year is the engine wiring harness and the body wiring harness?

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post #32 of 39 Old 03-15-2013, 07:53 PM
YJjeep258
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Sorry about that its a 92 I was looking through the wiring harness and I found a wire that was a green and orange tracer wire that is not hook up I was think that might be it
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post #33 of 39 Old 03-18-2013, 02:06 PM Thread Starter
Djsthe1
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1991 YJ Wrangler 
 
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Location: Waldorf Maryland
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Mine is a 91 tub and a 89 motor, hope I dont have too many issues.
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post #34 of 39 Old 03-19-2013, 09:15 AM
YJjeep258
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Well You shouldn't have any problems just figuring out the wiring mess after you take the computer out, thats if you do take the computer out and what I did was with tach I just lead a wire off the back of the tach to the HEI distributor so I hope that works. I haven't tried it yet I had to replace a heater core and fix the valve cover gasket so hope to run it today.
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post #35 of 39 Old 03-19-2013, 03:49 PM Thread Starter
Djsthe1
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So you removed the body harness and went with the one from the 4.2?
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post #36 of 39 Old 03-19-2013, 07:36 PM
YJjeep258
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No what I did was I got rid of the engine harness and most of the necessary sensors are on the body wiring and the temp sensor will have to be spliced to the body harness. There are two connectors which you unplug and then over by your alternator you cut those wires that connect the body wiring to the engine wiring which is a green and orange tracer wire. Then find the connector that goes to temp sensor which is a purple and yellow wire and you cut that connector and splice into the same color wire which is on that plug on top the engine. This is what I did and I will post some pictures tonight also.
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post #37 of 39 Old 03-19-2013, 07:44 PM Thread Starter
Djsthe1
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1991 YJ Wrangler 
 
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Gotcha, so you kept your body wiring just spliced in the sensors on the 4.2. I was just wondering how the gauges matched up. What TC and trans are you running?
Does the speedo gear match up?
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post #38 of 39 Old 03-19-2013, 08:43 PM
YJjeep258
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Also you have to cut a two orange wires and a blue and black wire also to get the engine harness removed. We ended up using the sensors off the 2.5 and with the temp sensor I had to make an adapter using brass fittings and I tried using the temp sensor that came on the 4.2 it didn't work and the gauges work fine, excepted the fuel gauge which we missed a wire when hooking up the sending unit on the tank. The transmission were using is a Borg Warner T5 and the transfer case were using is a Dana 300 that has been flipped and we didn't use the clocking ring. Were also putting the twin shifters on the that to and the speedometer sensor work with the Dana 300.
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post #39 of 39 Old 04-02-2013, 05:16 PM Thread Starter
Djsthe1
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1991 YJ Wrangler 
 
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What gauges are you guys running? debating on getting rid of all the hoses and wires and just starting from scratch.. Aftermarket gauges seem like it would be easier than worrying about getting the tangled mess of wires all figured out...
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