Ok Guys working on my old 96 LT1 project. I am pulling the intake and drilling it for a Vortec distributor. Opti will be gone. Going with P59 Holden tune. I am using Pcm Hammer and Universal Patcher. How to change firing order 2-3 and 4-7 swap in Universal Patcher?
Table names etc?
Firing order
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Hotrod1952
- Posts: 10
- Joined: Fri Sep 16, 2022 3:54 pm
- cars: 1999 Silverado
1963 Nova getting LT1 4L60E TO P59 Conversion.
1972 GMC 1500 1999 Vortec on 411
1928 Buick getting 63 Nova 4cyl 153 Cu In engine
1952 Chevy Sedan Delivery
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Hotrod1952
- Posts: 10
- Joined: Fri Sep 16, 2022 3:54 pm
- cars: 1999 Silverado
1963 Nova getting LT1 4L60E TO P59 Conversion.
1972 GMC 1500 1999 Vortec on 411
1928 Buick getting 63 Nova 4cyl 153 Cu In engine
1952 Chevy Sedan Delivery
Re: Firing order
Found the "bank for cyl5 table" and swapped the firing order to the banks. How to assign dtc's to correct injector cylinder?
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sparepartsblazer
- Posts: 101
- Joined: Mon Dec 04, 2023 1:18 am
- Location: Missouri
Re: Firing order
Far as I remember from doin a CPC conversion on my old L31, changing the firing order in the ecm only effects the misfire data.
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Hotrod1952
- Posts: 10
- Joined: Fri Sep 16, 2022 3:54 pm
- cars: 1999 Silverado
1963 Nova getting LT1 4L60E TO P59 Conversion.
1972 GMC 1500 1999 Vortec on 411
1928 Buick getting 63 Nova 4cyl 153 Cu In engine
1952 Chevy Sedan Delivery
Re: Firing order
Okay, Then I hard wire the 4 injectors 4 - 7, 2-3, etc in the PCM plug. So If I get a misfire on Cyl 4 it will show as misfire P0307?
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sparepartsblazer
- Posts: 101
- Joined: Mon Dec 04, 2023 1:18 am
- Location: Missouri
Re: Firing order
I had to swap the firing order in the ecm and then swap the injector wires at the ecm.Hotrod1952 wrote: Wed Nov 19, 2025 11:50 pm Okay, Then I hard wire the 4 injectors 4 - 7, 2-3, etc in the PCM plug. So If I get a misfire on Cyl 4 it will show as misfire P0307?
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V8fan
- Posts: 144
- Joined: Sun Oct 31, 2021 8:27 pm
- cars: Astro VAN
Re: Firing order
You stays with 4x vortec or 24x LS reluctor ?Hotrod1952 wrote: Wed Nov 19, 2025 8:56 pm Ok Guys working on my old 96 LT1 project. I am pulling the intake and drilling it for a Vortec distributor. Opti will be gone. Going with P59 Holden tune. I am using Pcm Hammer and Universal Patcher. How to change firing order 2-3 and 4-7 swap in Universal Patcher?
Table names etc?