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Figured it out. So I did end up switching over to 12592618 Flex Fuel Avalanche. Just did a write entire with HP. The issue was I was only searching for “ethanol” percent instead of “alcohol” percent....

Ok none of that worked lol.

So I’m gonna try to write entire my original tune with everything segment swapped from the Flex Fuel 05 Avalanche OS: 12606961. If it still doesn’t work then I’m gonna license the Avalanche, 3bar...

Copy that. Sounds great thank you guys for the help!

So wait, if I license a p59 file that doesn’t match my original OS, I can write entire into my PCM? I did not know that.

Also, the fuel and system segments already match. And thank you for the reply.

Not sure how you achieved this - I believe that 2005 OS 12606961 was an upgraded OS for 5.3L engines only, and was therefore never used with a 4L80.[/QUOTE]

You are correct. But I found a dude on...

I’ve been reading that some guys just flash a flex fuel tune into their existing pcm. But I thought the OS had to match. I dont understand what they mean or how they’re doing it.

Does it have an aftermarket door chime for the stereo?

2005 Silverado P59 OS: 12606961. I finished everything up for the flex fuel as far as sensor and wiring. I found an 05 Avalanche L59 Flex Fuel with the matching OS in the repository. I did the seg...

Yeah sometimes these internet folk can throw you off. That’s why i asked, something was off about it for sure. I’ve got it handled now, thanks for the input.

Out the window it goes then. Thanks Ben.

I agree. Here's a copy and paste of what the write up says and the link also:

Fuel params:
- open loop tables and PE tables on newer OS's blend between gas and alcohol tables using blend factor...

Just going through the Tuning Shool book on Flex Fuel Tuning, when adding a flex fuel sensor and selecting "sensor" in the drop down menu for flex fuel, the book doesn't touch on how to set up the...

Hey, I?ve been a member for quite a while but I never post anything. I was trying to download a file for a segment swap but it?s telling me I don?t have rights. Can someone point me in the direction...

Ok thanks for the replies I will try both of those things.

Ok I'll do some smoothing. I've tuned a few different cars with very little smoothing and they have not had any issues but I will start doing that from now on.

Yes I've got AFR Error set up with...

Current set up is an 05 Silverado with a gen 4 6.0 running off the factory gen 3 style pcm, NA set up as of now. I've been having this issue for a few months now. I get it dialed in 12.6-12.8 afr on...

Ok makes sense. Thanks again for your help. I'll try tomorrow and if you hear nothing all is well.

Ok and to make sure I have it strait. I need to delete MPVI.1 from the Channel. And I only need AFR Commanded in the channel right? Or do I need to add AFR error to it also? Other than that I think...

Ok I'll give that a shot thanks so much. Will that also be the fix for the MPVI.1 input not getting data for the WB in the graph and chart?

Crap sorry.

Here's what you asked for. Thanks for the help. P.S. it's a very short idle log.

56823568245682556826

I was just about to post the things you asked for when I realized I was also logging equivalence ratio commanded. could this be the cause?

We're you able to get this to work? I've got AFR commanded and MPVI.1 AEM in my channel and they are working. I've got the math set up like this. 100*([30001.10]-[50121])/[50121]. I've got all the...