LQ4 Wiring Harness on LS1
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Teching In
Joined: Nov 2011
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From: Agoura Hills, CA
LQ4 Wiring Harness on LS1 Howdy,
My question..
Would the engine wiring harness from an 2007+ LQ4 with an E38 PCM (reflashed) easily connect on a completely stock LS1/T56 out of an fbody or would my time be better spent searching for a junked LS2 equipped car?
I've tried searching, hence why I'm posting on LS1 Tech after so long.
I have a company who is going to be modifying (combining) my wiring harnesses from my shell (subaru) and on the other end, they told me they need the E38/40/67 PCM and the wiring harness that comes with it. They suggested just snagging one from an LS2 GTO and calling it a day.
In the places i'm looking (junk yards), it's not common to come across a TBSS, Corvette, GTO..but coming across 2007+ Trucks is a dime a dozen.
*I will be using a drive-by-wire throttle body and a T56 out of an f-body as well.
My question..
Would the engine wiring harness from an 2007+ LQ4 with an E38 PCM (reflashed) easily connect on a completely stock LS1/T56 out of an fbody or would my time be better spent searching for a junked LS2 equipped car?
I've tried searching, hence why I'm posting on LS1 Tech after so long.
I have a company who is going to be modifying (combining) my wiring harnesses from my shell (subaru) and on the other end, they told me they need the E38/40/67 PCM and the wiring harness that comes with it. They suggested just snagging one from an LS2 GTO and calling it a day.
In the places i'm looking (junk yards), it's not common to come across a TBSS, Corvette, GTO..but coming across 2007+ Trucks is a dime a dozen.
*I will be using a drive-by-wire throttle body and a T56 out of an f-body as well.
Last edited by KSKENE; Nov 4, 2017 at 02:19 PM.
Howdy,
My question..
Would the engine wiring harness from an 2007+ LQ4 with an E38 PCM (reflashed) easily connect on a completely stock LS1/T56 out of an fbody or would my time be better spent searching for a junked LS2 equipped car?
I've tried searching, hence why I'm posting on LS1 Tech after so long.
I have a company who is going to be modifying (combining) my wiring harnesses from my shell (subaru) and on the other end, they told me they need the E38/40/67 PCM and the wiring harness that comes with it. They suggested just snagging one from an LS2 GTO and calling it a day.
In the places i'm looking (junk yards), it's not common to come across a TBSS, Corvette, GTO..but coming across 2007+ Trucks is a dime a dozen.
*I will be using a drive-by-wire throttle body and a T56 out of an f-body as well.
My question..
Would the engine wiring harness from an 2007+ LQ4 with an E38 PCM (reflashed) easily connect on a completely stock LS1/T56 out of an fbody or would my time be better spent searching for a junked LS2 equipped car?
I've tried searching, hence why I'm posting on LS1 Tech after so long.
I have a company who is going to be modifying (combining) my wiring harnesses from my shell (subaru) and on the other end, they told me they need the E38/40/67 PCM and the wiring harness that comes with it. They suggested just snagging one from an LS2 GTO and calling it a day.
In the places i'm looking (junk yards), it's not common to come across a TBSS, Corvette, GTO..but coming across 2007+ Trucks is a dime a dozen.
*I will be using a drive-by-wire throttle body and a T56 out of an f-body as well.
I would also get a Gen3 harness if you're using an LS1. That said, is it actually an LS1? Because you say youre using a DBW and T56 from an f body, but they weren't DBW until 2010 and those aren't LS1s.
Thread Starter
Teching In
Joined: Nov 2011
Posts: 16
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From: Agoura Hills, CA
Like I said to JoeNova, i'm just learning how different the harnesses are for such similar engines. If I found an LS1 that looked good and still wanted DBW(which i probably won't do), I had imagined I could just use a (DBW) Vortec harness on the LS1.
It's fun learning all these differences.
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From: Ohio
The main differences between gen 3 and gen 4 is the tooth count on the crank wheel. 24x for gen 3, 58x for Gen 4.
The PCMs are not interchangeable between them, and therefore neither are the harnesses. You CAN run a gen 4 engine on a gen 3 harness using a conversion box from Lingenfelter, but not the other way around.
An LS1 is a gen 3. Get a Gen3 harness/PCM.
The E38/40/67 PCMs are Gen 4.
LQ4s are all gen 3, from 99-early 07.
The PCMs are not interchangeable between them, and therefore neither are the harnesses. You CAN run a gen 4 engine on a gen 3 harness using a conversion box from Lingenfelter, but not the other way around.
An LS1 is a gen 3. Get a Gen3 harness/PCM.
The E38/40/67 PCMs are Gen 4.
LQ4s are all gen 3, from 99-early 07.
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Thread Starter
Teching In
Joined: Nov 2011
Posts: 16
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From: Agoura Hills, CA
The main differences between gen 3 and gen 4 is the tooth count on the crank wheel. 24x for gen 3, 58x for Gen 4.
The PCMs are not interchangeable between them, and therefore neither are the harnesses. You CAN run a gen 4 engine on a gen 3 harness using a conversion box from Lingenfelter, but not the other way around.
An LS1 is a gen 3. Get a Gen3 harness/PCM.
The E38/40/67 PCMs are Gen 4.
LQ4s are all gen 3, from 99-early 07.
The PCMs are not interchangeable between them, and therefore neither are the harnesses. You CAN run a gen 4 engine on a gen 3 harness using a conversion box from Lingenfelter, but not the other way around.
An LS1 is a gen 3. Get a Gen3 harness/PCM.
The E38/40/67 PCMs are Gen 4.
LQ4s are all gen 3, from 99-early 07.
or an LS1 with it's wiring harness and PCM
Slap a standalone wiring kit on either of them as well as a t56 and I should be good to go (obviously oversimplified).
Whether it's DBW or DBC, i'm gonna run it and call it a long day.
Sound plan?
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Teching In
Joined: Nov 2011
Posts: 16
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From: Agoura Hills, CA