Abstract: An engine control apparatus comprises a cylinder discrimination sensor for generating cylinder discrimination signal, a crank angle sensor for generating crank angle signal, a fuel injection valve provided in each cylinder of the engine, an ignition coil provided in correspondence to each and every cylinder, a flip-flop circuit for detecting a state of misfire in each cylinder on the basis of a state of signal of said ignition coil, and a micro-computer for receiving the cylinder discrimination signal, the crank angle signal and the output signal of the flip-flop circuit to detect that a state of misfiring has occured continuously at the same cylinder and for closing the fuel injection valve corresponding to the cylinder where the misfiring has occured.

Abstract: An ignition signal distributing circuit for a multicyclinder engine in accordance with the present invention comprises a delay circuit which delays an output signal of a crank angle sensor or a cranking switch signal for the duration until the first output signal of the crank angle sensor is completed in the early stage of the time immediately after a starting of power supplying, and thereby an output of an error ignition signal can be prevented which is caused by that the crank angle sensor outputs a detection signal when power supplying is started.