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Modern electronically controlled engines use a sensor to keep track of the position of the pistons for spark timing. Since all the moving parts in the engine are mechaically linked, only one sesor anywhere in the system can provide the required information. Most systems put this sensor on the crankshaft. But a sensor on the camshaft would also work. The sensor itself is a simple magnet and pickup coil. The coil sends out a pulse every time the magnet passes it.

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