Calibration Number Identification

To identify engine calibration number, locate engine code label on valve cover at front of engine. See Figure. Calibration codes usually begin with a number indicating current model year. For example, calibrations for 1989 usually begin with "9". Each vehicle is also equipped with an emission control data decal which applies to that vehicle and engine. See Figure. These decals are usually located on underside of hood or other visible engine compartment location.