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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 signal from the crank sensor alsotells the PCM how fast the engine is running (engine rpm) so ignitiontiming can be advanced or retarded as needed. On some engines, aseparate camshaft position sensor is also used to help the PCMdetermine the correct firing order. The engine will not run withoutthis sensorâs input. There are two basic types of crankshaft position sensors: Magnetic Field (Variable Reluctance) and Hall Effect (Figure 1).The magnetic type uses a magnet to sense notches in the crankshaft orharmonic balancer.