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Thread: What happend to commanded AFR and Injector PW Pids?

  1. #1
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    Default What happend to commanded AFR and Injector PW Pids?

    I'm working with a '07 Silverado E38 (OS 12614088). When the scan first starts I see "good" Commanded AFR. But after about 4 seconds it suddenly jumps to 29.36 (twice 14.68). At the same time Injector Pulse Width jumps from 234 mSec (an impossible number) to 456 mSec. I'm using E38AFRATIO_DMA and GM.IBPW1 & GM.IBPW2, same PIDs I use with a '06 Z06 (OS 12605732).

    By the way, thanks to Dragframe's " Interesting Issue: MAF failure = Idle tables ignored. Cant tune VE because of it" thread! Same year / OS. I saw the same MAF problem. That post helped me understand why I could not tune the idle.

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    Quote Originally Posted by Yellow05C6 View Post
    I'm working with a '07 Silverado E38 (OS 12614088). When the scan first starts I see "good" Commanded AFR. But after about 4 seconds it suddenly jumps to 29.36 (twice 14.68). At the same time Injector Pulse Width jumps from 234 mSec (an impossible number) to 456 mSec. I'm using E38AFRATIO_DMA and GM.IBPW1 & GM.IBPW2, same PIDs I use with a '06 Z06 (OS 12605732).

    By the way, thanks to Dragframe's " Interesting Issue: MAF failure = Idle tables ignored. Cant tune VE because of it" thread! Same year / OS. I saw the same MAF problem. That post helped me understand why I could not tune the idle.
    Yeah that maf fail issue haunted me. I made a big change i need to test to see if it will idle now with the mad failed though. I report back to ya when i get around to failing the maf again. Right now its running surprisingly well MAF-OL. (I have odd issues in closed loop but thats another topic... this 07 e38 is a pain)

    When its coming to the commanded AFR issue... that is bizarre. When i get away from work ill poke around and see if i can find anything. Can you post the tune and log?

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    This is on a GMPP LS3 DR525 crate engine with a magnuson supercharger.

    BarryNewStart_0009.ctzBarry Cold Start 8-5-2019.efi

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    Quote Originally Posted by Yellow05C6 View Post
    This is on a GMPP LS3 DR525 crate engine with a magnuson supercharger.

    BarryNewStart_0009.ctzBarry Cold Start 8-5-2019.efi
    Hmm latest update locked older versions from opening its tune files. Ever since HPT and EFILive started deleting epa tables off i dont want to update lol

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    The GMPP kit uses an E67. This is just the GMPP engine with a non-GMPP harness and an E38.

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    What I meant is in the latest efi live update, they changed some security stuff and older versions of the software wont open files from the latest software.

    BTW. I figured out my idle issue was table b1703 has a ridiculously low figure like 60 in it. Once I raised that up to match b1701 my idle issue went away in SD. I found other issues tho like trans pressure going bezerk (blew a trans cooler line even). I got two logs in sd, fixed the ve up a fair bit off that, and put the maf back on. My afr is much closer to my commanded afr now.

    Did you ever figure out your commanded afr issue??

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    I have not had time to tinker with it. I live near ground zero for Hurricane Michael and life has a way of getting in the way of fun.

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    Quote Originally Posted by Yellow05C6 View Post
    I'm working with a '07 Silverado E38 (OS 12614088). When the scan first starts I see "good" Commanded AFR. But after about 4 seconds it suddenly jumps to 29.36 (twice 14.68). At the same time Injector Pulse Width jumps from 234 mSec (an impossible number) to 456 mSec. I'm using E38AFRATIO_DMA and GM.IBPW1 & GM.IBPW2, same PIDs I use with a '06 Z06 (OS 12605732).
    GM.IBPW1/2 are for LS1 and E40.
    GM.INJPWB1/2 are for E38, E67, E92.

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