I read somewhere that on OBD2 systems, Time Set doesn't work anymore and always just shows 3.5. I used Time Set to get the base timing set to 3.5*. The truck is a 99 Hummer, it's OBD2, new P400, new DS4 IP, the ECM has a Heath tune, and I'm using an AutoEnginuity scan tool. Hi, I've been bashing my head against the wall on this and getting nowhere.
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