| I'd think that a retune would be needed for a 3000ft elevation difference. You are probably to lean now. And for the record severe knock can exceed 15.5 degrees. I'd start by adding some fuel pressure but another chip maybe in order. And you can't expect the O2 sensor to give you dead accurate numbers, its really only good to let you if you are lean or rich. Were all of these readings taken during WOT operation? |