Tuners Rejoice! Free Tuning For M4.4! in Performance Modifications Posted August 18, 2014 · Report reply Been having some crazy knock issues too... But mostly at high loads (22 psi +) where the ECU will actually pull me down to 0-1.5 btdc when only trying to run 6.75 deg btdc. I'm curious to see if you find any resolutions. I might invest in some new sensors but I'm not sure if that would really make a difference.