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Thread: B3704 Injector assignments, just for clarification please.

  1. #1
    Senior Member
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    Default B3704 Injector assignments, just for clarification please.

    I feel like I know this answer, but I want to be sure. All the threads I have come across to this point just say "adjust b3704" but they don't go further than that. The swap in question is a 1995 LT1 running a custom harness, 0411 PCM, coil on plug, and an EFIConnection crank and cam sensor kit. The harness has had the 4-3 and 7-2 wires set up correctly, the engine runs great in open loop. Going to closed loop the trims get a little out of whack, which brings us here.

    I fully comprehend that we now have to change the bank assignments so that the correct cylinders correspond to the correct bank. What I am not sure of is how the injectors are identified within this software. Here is a screen shot of a FACTORY LS1 injector assignment, so in other words it set up for the original LS1 engine, 18726543

    In my mind this should be the correlation:

    Cyl# 1 2 3 4 5 6 7 8
    Injc A B C D E F G H

    But when looking at the stock screenshot it appears the injector letter corresponds to the LS1 firing order...

    Cyl# 1 8 7 2 6 5 4 3
    Injc A B C D E F G H

    Click image for larger version. 

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    So even though my brain wants my first example to be correct, EFIlive/GM has set it up to be the 2nd example, correct?

  2. #2
    Joe (Moderator) joecar's Avatar
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    Default

    I don't quite remember anymore, it's either as you said (follows engine firing order), or reversed engine firing order...

    Cylinders: 1-8-7-2-6-5-4-3
    Coils: A-B-C-D-E-F-G-H
    Injectors: H-G-F-E-D-C-B-A

    both ways match B3704.

  3. #3
    Senior Member
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    Default

    I can't imagine a reason for it to be reversed

    H G F E D C B A
    1 8 7 2 6 5 4 3

    But either way it appears that it corresponds to the LS firing order.

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