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A camshaft is the element of an internal combustion engine the purpose of which is to open and close the valves.orking in conjunction with the crankshaft, the camshaft rotates at half the speed of the crankshaft in a 4-stroke engine cycle and at the same speed in a 2-stroke engine.
The Camshaft Position Sensor is used for ignition timing and determining the RPM.    As the signal is needed for proper fuel injection, the fuel injection stops wheneve â¦ r there is no signal. Also the RPM meter drops to zero.