View Full Version : What happend to commanded AFR and Injector PW Pids?
Yellow05C6
August 5th, 2019, 01:42 AM
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.
Dragframe
August 7th, 2019, 09:02 AM
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?
Yellow05C6
August 7th, 2019, 11:32 AM
This is on a GMPP LS3 DR525 crate engine with a magnuson supercharger.
2296722968
Dragframe
August 10th, 2019, 06:52 AM
This is on a GMPP LS3 DR525 crate engine with a magnuson supercharger.
2296722968
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
Yellow05C6
August 10th, 2019, 07:54 AM
The GMPP kit uses an E67. This is just the GMPP engine with a non-GMPP harness and an E38.
Dragframe
August 18th, 2019, 03:46 PM
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??
Yellow05C6
August 19th, 2019, 02:17 AM
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.
joecar
August 25th, 2019, 09:36 PM
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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