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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.
CAM or Camshaft Position Sensor Testing Amazon Printed Books https://www.createspace.com/3623936 Amazon Kindle Edition http://www.amazon.com/Automotive-Test... Android APPs https://play.google.com/store/apps/de... The CAM sensor or camshaft position sensor's role is to signal the ECM the camshaft position. The crank and cam sensor operate in sync with each other. Without the CAM sensor the vehicle may not even start and cause hard starting. The CAM sensor is mostly used to determine which injector to fire in a sequential system and for COP or coil on-plug ignition systems coil firing event.