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Has anyone used the idle speed vs. ECT table to create a make shift selectable high idle? My thought is using a relay or two to change the ECT resistance to push the truck to a fake high ECT to raise the idle. I haven't gotten around to testing it but I think it may be possible.
You will need to make sure that whatever fake temp you command doesn't command insanely different fuel/spark, or trigger an "engine overtemp" DTC or something like that...but otherwise it works.
I think by doing the same thing they do with the IAT for nitrous retard (fake cold actually, not hot), you'll achieve the results you want.