3800 , 3800 series II , 4.3 vortec, 5.3 vortec, 5.7 vortec, 6.0 vortec, ( all OBD II ofcourse) Honda 2.2 vtec, 3.0 vtec, isuzu 3.5, 3.3 2.5. I did forget the stft monitor. By the rate of decay of stft after valve is commanded closed the computer can determine ... Login to read more.