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Confidence votes 131. The cam sensor tells the computer where your cam is in it's rotation. The info is used to determine spark timing and fuel delivery. if it's bad, you'll run rough or not at all.Vehicles with distributors will sometimes integrate thet sensor with the distributor.onfidence votes 131. The cam sensor tells the computer where your cam is in it's rotation. The info is used to determine spark timing and fuel delivery. if it's bad, you'll run rough or not at all.
Simply put, a camshaft position sensor determines the position and rotational speed (in RPM) of the crank. This is important because this information is used to control ignition timing and/or fuel injection timing. All of that allows your engine to function in the oh-so precise way, with the absolutely perfect timing, that it requires.