Apparatus for controlling ignition and injection in internal combustion engines. The apparatus includes a first wiper carried by the engine crankshaft and having a series of identical sectors, a proximity detector assembly mounted opposite this crankshaft wiper, and also a timing wiper carried by the engine camshaft and having sectors the number of which varies with the number of cylinders in the engine, a second proximity detector associated with the timing wiper, a logic-circuit-type comparison device connected to the proximity detector to deliver a signal which is a function of the position of the engine pistons, and a device for controlling the engine ignition, the input of this controlling device being connected to the output of the logic circuit.