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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.
The camshaft position sensor, on your 3.8L V6 GM engine, is a three-wire Hall Effect Type sensor. So, for it to work, it's gonna' need an external power supply and a path to ground (for this power). 1  When you turn on the Key and crank the engine: 2  Power and ground come from the ignition control module.