1SlowHoe

iTrader: (28)

GM service tech told me that being low on fuel and getting crap in the lines could confuse the sensor and cause P0179 to set. I was 99% empty when this happened.
I'm going to delete the codes and see if they come back.
See quote below:

This is what I was thinking. I need to see if there are any DTC enablers that tell the PCM to do something besides trip the SES light. Such as pull timing etc. I guess I need to go through it all and turn off everything related to E85. This si if the SES resets. If it was just a fluke I will probably leave those alone and turn off the rear O2's.

1SlowHoe

iTrader: (28)

BTW, I was just looking and some of those tables are not available in this tune. When I switched to the 80E I had to change the OS. It was not an E85 tune. Check it out:

DrX

iTrader: (7)

Oops! I was thinking you were running a custom OS. You still have ethanol tables though. So you would be copy/paste B3605 to B3648, zero out B3660 and B5947, and copy/paste the 0% column of B3642 to the 10,20,50 and 80% columns. You could do the same for the other E80-related tables(use the EFILive navigator to search "E80").

1SlowHoe

iTrader: (28)

Made the changes plug changed a few of the DTC's. If you want to compare I attached the new tune

1SlowHoe

iTrader: (28)

Loaded the above tune and it ran like pure *** for a minute. The AFR started in the low 10s. Idled for **** and ran for ****. After a few hundred feet it seemed to be ok. It ran good and the afr was in the 14s at cruise and idle and low 11's if I got on it some. I attached the log. Tell me what you think.

There may be a few spots where the mph and rpms seem to go up really quick. It just rained and I turned the traction control off for some fun cornering

DrX

iTrader: (7)

Looks like it is rich until it warms up. Did you also try disabling P0178 and P0179? What happens if you disable B4206 so you are in full open loop until warmed up? Does the system hold fuel pressure with the key off? 42lb injectors?

1SlowHoe

iTrader: (28)

FP holds with the key off. I do have 42# SVO injectors. It has always run a little rich at startup but not with the AFR in the 9's/10's. Usually in the mid 12's until warmed up (less than a minute) then it settles into the mid to high 14's.

I have not turned off the codes you listed. Not sure what that would do.

DrX

iTrader: (7)

So the injectors seem OK. P0178/P0179 are the fuel comp sensor DTCs. Could be triggering additional enrichment as per DCJustin's explanation. Your startup enrichment could have always been setup a little rich but it would get worse if the PCM was defaulting to E80.

Disabling B4206 would take the O2s out of the equation until warmed up to rule out an issue there.

1SlowHoe

iTrader: (28)

Ok, I will disable that and see if it helps. If it does what you are thinking, I should see AFR @ 14.x right at startup and it should stay there after warmed, correct?

DrX

iTrader: (7)

You should see more normal startup enrichment that decays to 14.X without having to wait until you reach your closed loop enable temp. It's worth a try.