I've got a stock '12 Silverado LC9 that was run with E85 one time and every since it's been stuck saying the alcohol percent is 66.7% even after resetting LTFT's and 4 full tanks of E10. Start rough when cold, commands 10.82:1 AFR and LTFT's quickly go to -30% and I get rich codes. I know there is a TSB saying this happens and the dealer has an updated calibration to reset it, looking through the calibration on the VCM editor I can't see what could be changed that would fix this/be associated with the TSB. I tried setting the max ethanol percentage to 15% and flashing that but the scanner still says 66.7% when idling.
Any ideas what the updated calibration looks like? Thanks!