Re: Question About the PCM....
TMK: The PCM will adjust the timing if the knock sensor detect pinging in the engine but this is all within certain parameters. If you run a higher octane the engine has no way of knowing this and will not increase timing, it has to be done manually w/ tuner. Only auto adjustment come from 02/knock sensors and using higher octane will not trigger those.
Only when you run lean/rich or timing is off (potential damage creating situations) does pcm compensate, not a performance type thing sadly :/ Hope that helps
Mods: A Bunch