Hello,
OK. Different problem then. I just looked at the three most popular 512k byte, P01 PCM operating systems that have richly featured Tuner Pro RT XDF definition files - "8322", "2156" and "2088". I'm not the sharpest knife in the drawer on this stuff but it appears that none of these XDF files expose Flex Fuel as an editable feature.
The one megabyte, blue / green connector, P59 PCM "7603" OS is a different story. It has a Flex Fuel feature that can be manipulated and we have a good XDF for this OS. The wiring harness for a P59 is a little different from a P01 PCM but this is not hard to change.
Rick
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