Been doing some more research, along the same lines of inquiry as sgod1100 it seems
There's a mountain of tests the ECM will do at will. Looking through these diagnostic pages, I struggle to find any tests that should still be applied when in open loop.
Here's the deal. O2 test or "comparisons" take place even in open loop. Take the rear O2's, hang them in fresh air and go do a wot pull. Guarantee it fails the precat O2's as it will leverage more toward believing the leaner of the two bank to bank and it'll go into permanent open loop because of this. I DO NOT know the specifics of how every test runs. Don't know if this is related or not, but it is a boosted application and GM did take "extra" caution because of that.
Quite a few o2 tests (stuck rich/lean in particular) seem to enable above 1100rpm and then disable above 2650rpm. Only problem is they all appear to enable in closed loop, and when I experience the lean spots I wouldn't be meeting the criteria to keep these tests enabled. Even the commanded EQ must be within the criteria, and in PE I'm commanding above the max., plus flowing more air than max. etc.
Closed Loop Diagnostic Max RPM - 3000 / Post O2 sensor diagnostic Max rpm (notice it doesn't mention closed loop) - 5000
Could it be real that there's a bug in some OS? Causing these tests to take place in open loop as well? If there are permanent DTC's for o2 or whatever else, would the ECM really keep commanding these tests?
Yes, It commands them over and over again until they pass
It's every single time we pass the specific rpm. Not once every drive cycle, every damn traffic light to traffic light. Is it really constantly looking for the test to go complete?
^^^ Yes
I'd seriously consider purchasing the Tech2Win or SPS gear, but not sure what it's capable of?
Have read that restoring a factory file using the GM software may clear the permanent DTC's, and before you start the car, disable all the o2 codes etc., then the permanents won't pick up?
There may be a way around it - set every O2 related and trim related DTC to no error then retest.
Any with experience with the Tech2/SPS? Is it as simple as it sounds, purchase a licence, find your file, flash to car with specific cable,
Yes, I was a GM tech for nearly a decade - it is that easy, but may not fix the problem......
https://gsitlc.ext.gm.com/gmspo/mode6/2017eparms.html
Screenshot (5).png