If the throttle is closed and the engine speed is above approx. 800 rpm, the deceleration fuel cutout is activated in order to reduce consumption. The DME blanks out the fuel injection and shifts the ignition timing (angle) in retard direction until the engine speed has dropped to below the cut-in speed. Below this speed, the injection is reactivated and the ignition timing drifts back in advance direction. The cut-in speed is dependent on the engine temperature and the drop in engine speed.