2001 Saturn SL2 cam shaft postion sensor

bank 1 cam shaft position sensor ? you have one bank .This vehicle does not have a cam sensor . The ICM provides a synthesized cam signal to the PCM.

run the fault codes and check for cam/crank position sensor failure
check that he cam shaft is turning ( broken belt)
check immobiliser operation

Have you checked whether it is on model?,does your vehicle can communicate with the variable sensors of the new engine? are the crank and cam shaft sensors the same on serial number or are different? Does the injection system gets the correct fuel pressure or is not sufficient.

Have you checked the fuel injectors? Fuel filter? Fuel pump? Sounds to me like you have a fuel delivery problem.

Try the following: remove the airbox and spray some starter fluid into the throttle body while someone else cranks the motor. If it starts for a second and dies, then you KNOW you have a fuel delivery problem. If it doesn't change and still won't start, then the problem is either a bad sensor somewhere (crank position sensor, maybe?) or no compression.

anybody thought to check if the timing belt is still turning the cam shaft
That is one reason that engine just stop dead with no spark

sounds like either you have 2 of the wires crossed.........one is loose....probably #1 or your #1 plug needs regapped or is not tight and losing seal....all will cause a misfire and set the check engine light

depending on your engine but my data tells me there is no cam shaft sensor

I HAVE A 98 SATURN, WON'T EVEN TRY TO START EVERY ONCE IN A WHILE. TURNS OUT TO BE THE CRANKSHAFT POSITION SENSOR

Have a look at this link, scroll to your engine & click on picture to expand for better view.

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528017e904

Here is where your cam sensor is located: