Everything seems to be functioning as it should with my flex fuel system, although the Eth content doesn't seem to change. Ive been running e85 from the pump for about a year, and it has never flucuated more than .5% from 85-86%. Clearly there is no way, as this is just pump fuel.
When i first installed the sensor I ran 93 then switched to e85, and the sensor responded correctly. No diagnostic issues, fuel temp looks roughly correct. For ref, this is the sensor I am using: https://www.atpturbo.com/mm5/merchant.m ... gory_Code=
I believe eth% is communicated via changing frequency, the raw voltage (shown at bottom of the attachment) does fluctuate as expected, but I have not logged.
Any thoughts? Clearly it could be a bad sensor, but just making sure I am not missing anything obvious.