Flex Fuel Not Learning

[LastPlace]

Without knowing how close your speed density is too accurate I’m gonna say start looking there

[LastPlace]

If your using flex fuel logic in a booster application, your speed density has to be spot on...

[paulsmithsr]

Well I’m located In Houston. Message me and I will take a look

[that_na_coupe]

If your using flex fuel logic in a booster application, your speed density has to be spot on...

I don't believe its a speed density problem. If it were, it would not read content correctly the revision before I changed the idle speed.

Also I see the exact same issue on 100% stock mustangs with a flex fuel tune. Again it'll be a random 1/100 type of thing.

One car will read ethanol and another will not with essentially the same tune, just slight changes.

[that_na_coupe]

ctm2 is a 2018 Mustang where the flex fuel is functioning perfect

Dredayz_5.0Rev7 is the 7th revision on a 2019 Mustang because I could not get it to read content.

[paulsmithsr]

from tunes posted they several several changes --have u just installed 18 tune into 19 and see if that works ?
'

[CCS86]

You are correct about sct and ngauge writing entire each flash.

So that should answer your question about it being "safe"

My SCT X4 bricked my car like 3 times. So much for safe.

I have used write calibration nearly 1000 times on my car. No issues.