Abstract: An engine control apparatus for preventing erroneous cylinder identification by clearing cylinder identification information upon detection of on/off operation of a starter (50) includes a sensor (32) for generating crank angle pulse signals with dropout portions corresponding to reference positions defined by tooth dropout sections provided in an angular position detecting member (31), a sensor (22) for generating cylinder identifying pulse signals, an electronic control unit (40) for identifying cylinders of the engine (10) and crank angle positions on the basis of sensor output signals. The electronic control unit (40) includes means for detecting changeover of driving/non-driving states of the starter (50), means for detecting an engine rotation speed (NE), and cylinder identification information invalidating means responsive for changeover of the starter driving states in an engine starting operation to inhibit the information from being employed in succeeding cylinder identification.