Deceleration Fuel Cutout

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 [1][2]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.