My 2003 pontiac starts runs for three mins and cuts off can it be the cam shaft sensor that is causing if it is where is it located at on the car

I think that the cam shaft sensor is part of the distributor on this model car. If the car does not start I would suspect other issues besides this sensor. Normally this sensor being bad just causes a car to run really bad.

cam sensor fail can be crank sensor fail engine will run with cam sensor fail but crank it will not fire. also recheck the timing belt settings you fit the timing belt and run engine till warm then recheck the belt adjustment to make sure its in line and at recommended tightness.

There are 12 common sensors and 10 internal sensors. The most common that often fail (MAP), (TPS), (CAM), (IGN), (CRANK) MAP is your mass air flow which is located at the beginning of your air intake, TPS is the throttle body position sensor, the CAM is the cam shaft position sensor (transmission), IGN ignition position sensor and the CRANK sensor is located near the bottom driver side front

the crank sensor is located in the bellhousing of the transmission and very easy to get to and its most likely the cause of the problem

i would check to see if fuel pump is suppling correct pressure

mcdevito75 here, BEST BET, let the shop do this work, too many un forseen problems could come up. The stalling and unable to start for a while could also be a bad ignition module, no test for this part, but I would have it changed, for if it is a bad ignition module, all this other work will not fix the stalling and later start of your car.

there is still more to check. like the mass air flow sensor, the whole fuel line cleanout, and if its an auto it does have a camshaft sensor. its located into the transmission.

is the engine going into the red zone in the temp gauge?? a/c will cause an extra load on your engine causing it to run hotter.

Try replacing first your ignition coil.

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c15280067e40