Theorizing here: HG internal leak means compression should be low somewhere right (on my list to verify). That would be misfires, correct, but anything else? Would that also mean a richer AFR? And then by extension, I would *not* expect more knocking, measured by FLKC, low IAM, LV,.. because those are lean indicators?
I'm absolutely not an expert on how these ECUs behave... this is where I need help.