Where is the crankcase sensor on a 93 Oldsmoble Cutlass Supreme?

If you are referring to the Crankshaft sensor, or crank angle sensor it is located on the passenger side of the engine compartment near the harmonic balancer. (For the 3.1 L)

I have a 95 with a 3.1L and it had intermitant missing and starting problems. I replaced the crank position sensor (which was located behind the harmonic balancer) and the camshaft position sensor (located under the power steering pump) and it corrected the problem.