Originally posted by Jon [in CT]
All US STi's have the exact same program flashed into their ECU's ROM.
That's what I would have guessed, which bums me out. Because it tells me that those STi's that are knocking, have another problem...not with the ECU. Like a knock sensor, or ? So if we deduce that it's not the ECU, why are they reflashing it? Answer me that.
Just FYI, mine knocked moderately between 4K and 4.5K rpms on 91 octane. With my xylene mix for a 94 octane fuel, I have zero knock.