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Disable/limit ethanol sensing on 2012 Tundra
I am attempting to disable the ethanol sensing on the 2012 Tundra 5.7 3UR-FBE. I have sent in 2 requests to HP Tuners and have not received anything back yet except they "will have the engineers take a look."
The reason we need to disable ethanol sensing is the Tundra computer when it sees anything lean it assumes ethanol and the ethanol count goes up but never goes back down. When this happens the ECU commands more fuel the higher the assumed ethanol. regardless of how much ethanol is really in there. The other kicker is we are running natural gas most of the time. I do not have any log files at this time but will in the near future. The truck and tune is stock up to this point. From what I understand every 5 key cycles the ECU will perform a check to determine ethanol. I have the owner of the vehicle to pull and reinsert the wire from the gasoline level sensor to manually reset the ethanol sensing and drive on gasoline until the ethanol check is complete (wait 3 minutes idling, drive 3 miles, under 3K RPM) then he can drive on natural gas again.
I have tried tuning the natural gas to be rich but natural gas does not perform well rich. This issue is the same on 100% gasoline without using the natural gas.
The stock file is attached
Thanks for any help. It is greatly appreciated.
Louis