This type fuel system complies with OBD 1 standards and was used on both the 2.0L and the 2.8L. Fuel is metered via engine speed and the mass of the air entering the intake manifold. The Engine Management System meters this fuel by firing the fuel injectors at a varying rate. Fuel volume is controlled by the duration of time the injector is left on. This "Injector Dwell Time" is usually measured in milliseconds of time.