The following vacuum diagrams are referenced according to calibration codes used by Ford Motor Company. To locate the vacuum diagram which corresponds to your particular engine, determine the engine displacement and model year from the exhaust emission decal, as shown in the accompanying illustration. Locate the set of vacuum diagrams for the appropriate model year, then find the calibration code for your specific car by referring to the engine code label (not the colored exhaust emission decal). This engine code label is located on the rocker arm cover. Locate the vacuum diagram with the same calibration code; this is the vacuum diagram for your vehicle.