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Thread: Post Injection

  1. #1
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    Default Post Injection

    I just recieved my EFI Live and just starting to play with it and have some questions regarding the post injection.

    1. What does post injection actually do?
    2. Is it strictly emmisions?
    3. How much fuel is actually injected and how badly does it hurt fuel economy.

    I read somewhere that if you put 1 in Table B1021 it will eliminate the post injection? Does that mean you actually put 1 in every box of the table?

    Thanks guys.
    2006 Silverado LBZ Stock.

  2. #2
    Lifetime Member GMPX's Avatar
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    Yes, post is used for emissions, it does not make more power as it happens after the 'bang'.
    They use it to control the DPF temps, it certainly does not help MPG!
    If your DPF is still in place then leave the post injestions alone.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  3. #3
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    if the truck in question is the one in his sig its an LBZ and there is no DPF... turn it off and no worries. egts will be a little lower (that I noticed with mine). other than that, no lossed that I have noticed... I dont have my laptop handy with table numbers but I zeroed out the post injection tables and I believe the multipliers as well.

  4. #4
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    Default Post Injection

    Thanks Guys, and sorry the truck is a 2006 LBZ so I don't think I have a DPF. Are the Tables B9301 and B9302? Post injection # 1 is already at zero. Do we just type into the table and save?
    2006 Silverado LBZ Stock.

  5. #5
    Lifetime Member GMPX's Avatar
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    I missed that too, LBZ the post injections are non functional anyway, but it's all in the ECM anyway.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  6. #6
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    are you saying that the post injections are non functional in that they dont do anything productive but the injections happen... or that they are just "dead" tables that dont affect anything because the injections dont happen?

  7. #7
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    I believe they are also used to keep the temps higher for the cat.
    08 Chev Crew, LMM, MBRP Tback, EFILive.

  8. #8
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    well I certainly dont need that function anymore lol

  9. #9
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    Did you notice any MPG increase?

    Thanks!

    Quote Originally Posted by tinman22 View Post
    if the truck in question is the one in his sig its an LBZ and there is no DPF... turn it off and no worries. egts will be a little lower (that I noticed with mine). other than that, no lossed that I have noticed... I dont have my laptop handy with table numbers but I zeroed out the post injection tables and I believe the multipliers as well.

  10. #10
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    nothing I really noticed. I want to believe that I gained a quarter to half mpg. but fluctuations tank to tank can easily be that much different unless you do the exact same driving day to day. and that I dont do

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