Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Which injector is 1:

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Old Sep 20, 2018 | 12:30 PM
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Default Which injector is 1:

Harness from an 04 Avalanche

I was thinking I knew the correct order of my injectors, but then I realized the harness on an '04 avalanche runs to the engine from the front, not from the rear, so that would mean that the injector wire furthest away from the fusebox would be #7 (on the driver side). I've seen some harnesses labeled, but I'm not sure if these are truck harnesses or not and for all I know an LS1 harness may be backwards.


UnderHood FuseBox ---------------------------------I--------------------I---------------I--------------------I
#1 #2 #3 #4

If this is the case, I've been thinking of it backwards.
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Old Sep 20, 2018 | 01:12 PM
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Not quite sure I understand your question but injector #1 is cylinder #1 driver side front and #7 is driver side rear as you stated.
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Old Sep 20, 2018 | 02:16 PM
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Yes, the truck harness puts #1 first and #7 fourth. When I did my car swap, I swapped the pins at the PCM, 7-1 and 5-3, it was easier than re-routing all the wires.
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Old Sep 20, 2018 | 09:24 PM
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Thanks! So I take it car wiring harnesses go to the engine from the back side?
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Old Sep 20, 2018 | 10:08 PM
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Yes, my entire harness runs behind the engine.
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