I have a 2006 Tahoe that is a non-flex fuel vehicle (12587811 OS) and I was looking into what it would take to run Ethanol in it... I am looking at everything from 2 seperate tunes (simplest way), to ways to use the flex fuel OS with a dial or something to blend the tables.
My first question is that in the flex fuel 2006 Tahoe OS (12605114), it says that it doesn't have a flex fuel sensor... so, how does it know how much ethanol is in the tank? How does the PCM know how to blend the tables?
Has anyone out there done anything like a dial - I would guess using a pinout on the PCM - to dial in how much ethanol (say you stop and fill up with 1/4 tank of gas still left)...
or is a retrofit possible - not sure what that entails since the Tahoe doesn't have a sensor...