Quote:
Originally Posted by FR-S2GT86
You're wrong in this case.
His ECU is still tuned for flex fuel. His ECU is looking at whatever is plugged into the ECU's input of the rear O2 sensor, be that the output of an Ethanol content analyzer or an O2 sensor. It's expecting to see the output of an Ethanol content analyzer, but now it's seeing the output of an O2 sensor, which fluctuates with the actual exhaust gases in the pipe after the rear catalytic converter.
The people that are running straight E-85 have a specific tune for that mix and don't require an input on the O2 sensor wire to the ECU to tell the ECU what the Ethanol content of the fuel is. It's predetermined by the tune. That's the main difference between a flex fuel tune and an E-85 tune.
And remember, most pump gas these days already have up to 10% Ethanol in it already.
The ECU needs to be reflashed to stock or he needs to install a new flex fuel kit.
EDIT: And then figure out where that smoke is coming from.
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That's gonna depend on the kit. My flex fuel kit retained both o2 sensors and used a third input from the ECA. I believe the newer Delicious kits use the rear O2 plug for the ECA input. So depending on the kit, I might still be right.
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