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Old September 3rd, 2013, 02:05 AM   #1
clubtahoe
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Default 2008 chevy 5.3 wiring in 90 yj Swap

I just bought a 2008 engine/trans chevy 5.3 (LY5) and i believe the 4L60e trans with all the wiring except the fuse panel, im leaving the NP231 In it. Is there an easy way for me to hook up the 5.3 motor wires into my 1990 yj i believe i disguard all the motor wiring that went with the jeep orginally right? It's a complete harness minus that big fuse box that the chevys have. id like to do it myself. Im leaving the motor stock only thing that will not be going in is the back O2 sensors. The best schematic ive seen is from LS1tech, is there any better. I dont need to cut all the wires out i just want to hook up the ones i need and leave the rest alone. Thanks
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Old September 3rd, 2013, 09:27 PM   #2
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Contact Jim.
http://www.jimsperformance.com/
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Old September 4th, 2013, 08:51 AM   #3
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Don't contact Jim, contact someone locally so if something isn't right, they can help you fix it.
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Old September 4th, 2013, 09:13 AM   #4
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Just out of curiosity, but why are you using a Gen IV motor on an old jeep swap?

From what I've seen in going through this for my JK the Gen IV are considerably more pricey than the Gen III.
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Old September 4th, 2013, 09:15 AM   #5
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I know there are a couple people that had problems with Jim but I think that is common with any industry. On the other hand, he's been doing it for years and has a great reputation with the racers. On a personal note, I spoke with him on the phone and when I got it back, it was plug & play. I had a problem that he went to great lengths to help me with and as it turned out, it wasn't his problem. I had the wrong DBW pedal assembly.

I don't think it's right to say "don't contact this person" unless you have had personal issues with them, AND, you offer alternatives. Yes, I am a big supporter of local business but I can't offer a personal reference. For Jim, I can.
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Old September 4th, 2013, 09:17 AM   #6
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With the LS swap I found it easier to hook up what I needed then once it was running get rid of what you dont. Cut the 5.3 harness down then make it work in jeep, then clean up what you don't need in the jeep, which won't be much since you will need new gauges and all. Only thing you should need to hire out is the computer work to unlock it so it will start, remove your rear o2, and don't forget to have the 4 cylinder mode shut off.
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Old September 4th, 2013, 09:19 AM   #7
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With the LS swap I found it easier to hook up what I needed then once it was running get rid of what you dont. Cut the 5.3 harness down then make it work in jeep, then clean up what you don't need in the jeep, which won't be much since you will need new gauges and all.
Seems like no matter how you do it you end up with way more wires than you need.
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Old September 4th, 2013, 09:21 AM   #8
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Seems like no matter how you do it you end up with way more wires than you need.
I started my motor for the first time about a year ago and I'm still working on wrapping everything up and pulling lots of lots of wire that's not needed out. But yes I do agree.
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Old September 4th, 2013, 09:36 AM   #9
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I know there are a couple people that had problems with Jim but I think that is common with any industry. On the other hand, he's been doing it for years and has a great reputation with the racers. On a personal note, I spoke with him on the phone and when I got it back, it was plug & play. I had a problem that he went to great lengths to help me with and as it turned out, it wasn't his problem. I had the wrong DBW pedal assembly.

I don't think it's right to say "don't contact this person" unless you have had personal issues with them, AND, you offer alternatives. Yes, I am a big supporter of local business but I can't offer a personal reference. For Jim, I can.
How many people have had done the swap and didn't have issues with the computer or harness? Pretty simple Jim, if you can't do it yourself, use someone close enough to help you when it isn't right...........because most of the time something isn't right. Do you want pictures of the harness Jim wired wrong for me or will you take my word for it? Emails of how he couldn't help me with a computer issue or take my word for it? Both minor issues on Jim's end that were a pain in the dick to track down and fix myself. Computer and harness started my car up and it ran, for most that's good enough. My specific issue was a TC lockup failure and the file he put in it wouldn't allow me to use HPtuners on it to "fix" it because the OS didn't match my vin#. He doesn't save the original files with the vin for me to give to HPtuners for them to "fix" it. He was able to provide me with a Vin number for the OS I needed and once I found a Tech2, I put the OE program back in changing the Vin to the number he gave me........which gave me access to use HPtuners........to find out it was a wiring issue. See where I'm going with this.
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Old September 4th, 2013, 10:01 AM   #10
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That's a different scenario than just saying don't use him. You have had personal dissatisfaction with him and now your comment carries weight. Sure I believe you, why wouldn't I? I'm also disappointed to hear that he doesn't save info. That would suck if my computer ever fails and I want it reproduced.

I know it's simple for someone that understands it but I'm not that guy. That and he made mods to the ECM which I am DEFINITELY not that guy.

So, who do you recommend for us computer idiots?
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Old September 4th, 2013, 11:05 AM   #11
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Don't contact Jim, contact someone locally so if something isn't right, they can help you fix it.
I guess I should specify, find someone local that you can talk with face to face and potentially help you figure out what's wrong if you encounter a problem. "Jim" specifically isn't the issue.
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Old September 4th, 2013, 12:09 PM   #12
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So, who do you recommend for us computer idiots?
It was intimating when I picked up my engine and saw my harness glob and I thought holy shit what did I sign up for. Being my first time, I sourced someone to ship my harness to and clean it up, and label everything and flash my computer. $350 bucks well spent, I shopped around and found someone in AR on ebay, called and spoke with the guy, asked a few questions and I went thought with it, and had 100% no issues. Seriously he eliminated 80% of it, added a fuse block and relays(cooling fan included) and labeled everything in a manner that it was damn hard to screw up. I also had a lot of help from a local shop that help me get my truck's harness and the engine harness working together which was only a few wires, however I was in the middle of moving and needed the truck to run so I had them do it for me just get it going and on the road again. But in the end I decided I will still ship out the harness if I do it again and tackle the rest myself since I ended up going back though everything anyways because things like my TCC was left unhooked and I still had to go back and wire up all my gauges anyways. The swap is popular so any issue you should be able to google it, also LS1 tech is a great place for information.

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Old September 4th, 2013, 12:34 PM   #13
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I also had some minro issues with Jim when I did a harness for my 5.3. I didn't care for his attitude when I talk with him personally, he always seemed argumentative/defensive. He didn't want to believe that I had a 2007 Gen III motor. Cut off the front O2s and left me with just the rear O2s in the harness, which caused me to need to buy new O2 sensors to fit. A few other minor things. I have heard a few other complaints with programming/torque management from others, but I had mine set up for a TH350 so wasn't dealing with an electronic trans.

I'm trying to figure out for my current build who to go with. I have heard good about speartech and Psy. My main concern is finding someone who can tune a motor in the detroit metro area..
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Old September 4th, 2013, 01:00 PM   #14
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I also had some minro issues with Jim when I did a harness for my 5.3. I didn't care for his attitude when I talk with him personally, he always seemed argumentative/defensive. He didn't want to believe that I had a 2007 Gen III motor. Cut off the front O2s and left me with just the rear O2s in the harness, which caused me to need to buy new O2 sensors to fit. A few other minor things. I have heard a few other complaints with programming/torque management from others, but I had mine set up for a TH350 so wasn't dealing with an electronic trans.

I'm trying to figure out for my current build who to go with. I have heard good about speartech and Psy. My main concern is finding someone who can tune a motor in the detroit metro area..
ls tuners in michigan - LS1TECH
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Old September 4th, 2013, 02:04 PM   #15
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Just found the company I used on ebay again. I wouldn't hesitate to use them again to rework a harness. However I will be using someone local to tweak the tune and fix my tach signal strength now that its in the truck, but the tune they provided works great just I believe it could be squeezed a bit more. But technically this company backs their tunes and will retune or fix anything free of charge if you ship the computer back to them.

http://www.ebay.com/itm/wiring-harne...71e215&vxp=mtr
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Old September 20th, 2013, 11:54 PM   #16
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i got a great price on the motor trans under 70,000 miles had to do it
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Old September 20th, 2013, 11:58 PM   #17
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I guess its just a challenge for me to do the wiring im an electrician by trade, i know i do high voltage and probally shouldnt touch car wiring but im good with schematics only thing i question is when all the wiring is out i probaly have to install some relays and i want fuses. i guess its just the challenge
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Old September 20th, 2013, 11:58 PM   #18
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good price
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Old September 21st, 2013, 12:01 AM   #19
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feva4u i appreciate the info thanks, this will be a fun swap, my last swap was a 1980 cj-7 with a 302 that was easy barley any wires
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Old September 21st, 2013, 02:54 PM   #20
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thanks montecarlo33 i emailed him i think ill go that way
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