how to disable flex fuel?

[slowride]

This was from the other day. The fuel comp learn mode doesnt always activate after refueling, and I mean 10 or more gallons each time, then randomly it will activate the next time and go from 20% to 50% to 27% then stop on something like 50%-70% within like 2 minutes. I'll check other things like 02 sensors, but bottom line I want to delete/disable anything related to flex fuel operation on this thing, Im tired of it

 

[Scottydoggs]

-20 is rich af. content sensor might have gone bad too.

 

[Mudsport96]

Get some carb cleaner and spray around where the heads and intake meet, and where the clamps are on the intake tube. See if it is getting unmetered air somewhere. Also, if it is not recalculated every fill up more than 10 gallons you may need the update.

 

[Mudsport96]

 

[Fless]

View attachment 351608

While that's a good example, below is what the calibration history looks like for the OP's VIN. Slightly newer calibration for the engine. As well, there are other non-engine calibrations that can affect the fuel composition calculation.

 

[jwth]

a tuner with hptuners or efilive can disable it and remove the error messages,,,but it is not free. There is a cost for the licensing for the software and I would assume for the owner of the tuning rig.

 

[Mudsport96]

While that's a good example, below is what the calibration history looks like for the OP's VIN. Slightly newer calibration for the engine. As well, there are other non-engine calibrations that can affect the fuel composition calculation.

View attachment 351609

Odd that they are both 06s and there are 2 different os updates...

 

[slowride]

Thanks a lot for the info. So is that calibration # something I could take to a dealer and the should know what Im talking about upgrading? I checked the Tech II owner list post but didnt see anyone near me in NC with one. Will also look into the cost of one of the custom tunes and whats involved with loading that on my ride. I got some gas today and now Im showing 63% alcohol lol

 

[Fless]

Thanks a lot for the info. So is that calibration # something I could take to a dealer and the should know what Im talking about upgrading?

Yes. Updating the calibrations shouldn't take much time. I'd think less than an hour's worth of shop time. They do it all the time. But discuss your concerns before you have them update.

 

[Mudsport96]

Ran me 62 bucks in the middle of Illinois. 20 minutes shop time