Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Old Feb 24, 2010 | 04:04 PM
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Default S10 wiring

Hey guys, i have a 98 s10 that im looking to put an LS1 into. I was wondering what the best wiring harness to use would be. I was looking at the Perfect Hi RPM system from Painless Performance. It comes with the harness, camshaft, and the computer. It seemed like a pretty good deal to me. Also i heard the s10 computer could work with an LS1.. is this true?
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Old Feb 24, 2010 | 09:02 PM
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Your 98 PCM will not work with it, only the 2001 and newer ones do, with 2001 and 2002 being the best to use. Depending on what motor you're installing a truch harness might be your best choice, since it can be made to work with your factory fusebox
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Old Feb 24, 2010 | 10:11 PM
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Originally Posted by poconojoe
Your 98 PCM will not work with it, only the 2001 and newer ones do, with 2001 and 2002 being the best to use. Depending on what motor you're installing a truch harness might be your best choice, since it can be made to work with your factory fusebox
??

I have been reading about s10 swaps for years and I have never heard of someone using a stock computer to run an LS motor. The older vortec motors yes, but not an LSx of any kind.
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Old Feb 24, 2010 | 10:38 PM
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^^^thats a first for me as well
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Old Feb 24, 2010 | 10:39 PM
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^^^thats a first for me as well
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Old Feb 25, 2010 | 04:27 AM
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Originally Posted by dimetweaker
??

I have been reading about s10 swaps for years and I have never heard of someone using a stock computer to run an LS motor. The older vortec motors yes, but not an LSx of any kind.
You learn something new every day, use the knowledge in good health, and to say money when possible.
A siverado uses the same PCM as a S10 or Astro Van for a 4.3, it also uses the same PCM for the Gen3 motor, so why couldn't you use the S10 PCM for the Gen3 motor, since the only differance is the OS, which is changable
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Old Feb 25, 2010 | 05:35 AM
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This site should answer any questions you have about the swap.

http://forums.s-series.org/viewtopic.php?f=12&t=38750
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Old Feb 25, 2010 | 07:13 AM
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Originally Posted by Sinister 87
This site should answer any questions you have about the swap.

http://forums.s-series.org/viewtopic.php?f=12&t=38750
That post was made in 2005... tell them to update the thread, cause a lot of that info is old and incorrect.

Look here, it's a little more recent:
http://www.s10forum.com/forum/f213/l...mation-390967/
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Old Feb 25, 2010 | 08:48 AM
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Originally Posted by Jones'n
That post was made in 2005... tell them to update the thread, cause a lot of that info is old and incorrect.

Look here, it's a little more recent:
http://www.s10forum.com/forum/f213/l...mation-390967/
Yeah, I'll get right on that......Thanks! By the way, that's a hell of a post count.
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Old Feb 25, 2010 | 10:41 AM
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Originally Posted by poconojoe
You learn something new every day, use the knowledge in good health, and to say money when possible.
A siverado uses the same PCM as a S10 or Astro Van for a 4.3, it also uses the same PCM for the Gen3 motor, so why couldn't you use the S10 PCM for the Gen3 motor, since the only differance is the OS, which is changable
new info is always welcome! just curious, have you actually done this? I just cant believe I never ran across this before. I just wonder if the tuning and adapting the old harness comp/ to the new motor is easier than using a new harness/ comp? sounds interesting for sure though.
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Old Feb 25, 2010 | 11:16 AM
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Originally Posted by dimetweaker
new info is always welcome! just curious, have you actually done this? I just cant believe I never ran across this before. I just wonder if the tuning and adapting the old harness comp/ to the new motor is easier than using a new harness/ comp? sounds interesting for sure though.
I don't use the harness, just the PCM, but there are guys out there that have adapted the harnesses over.
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Old Feb 25, 2010 | 12:15 PM
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Yea i didnt really think the computer would work but i read it somewhere and was jsut wonderin if it was true.. Im rebuillding this engine and the painless kit kind of appealed to me becasue it came with the cam and the computer was pretuned.. does anyone have any experience with the kit?
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Old Feb 25, 2010 | 05:28 PM
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The PCM will swap if its the right year, Ive have two 4.3 PCMs on my swaps. I prefer them because you can grab them for $30-50 compared to the $100-120 on V8 PCMs. You have to tune the PCM either way so who cares what it originally came with

4.3 harnesses can be adapted from most any year. A handful of connectors will need to replaced or added and the whole thing reworked. Its a big job
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