RE: Lumina No Start!
I would check for injector pulse, first. On some makes and models, I have used a testlite on the terminals at the injector plug, to check for a pulse with the engine cranking. It's probably safer to use a noid lite.
I believe your vehicle has a theft deterent system, some of these will disable the injectors and starter also?
On some dis systems, during the cranking rpms, it's the ignition module that controls the spark. You have a second crank sensor that is a direct input to the ignition module, so the module has a signal, and there is spark. I believe that crank sensor to be ok. If it wasn't producing a signal, there would be no spark. Probably any system, that has spark and compression, if you add some kind of starter fluid to the intake, you should get a rumble. By the way, if I add some kind of starter fluid, I take the air-duct loose from the throttle body, open the throttle valve, then spray a little. On some models, there may be a sensor in the air-duct, and you may not want to spray anything flamable on it.
The other crank sensor should be located behind the crankshaft pulley. The cam sensor may be located on the timing cover, about where the end of the camshaft would be. I would'nt replace anything without doing some tests.