[amac209]

chevy trucks with a H or K engine don't have a crank sensor. there is a reluctor wheel and pick up coil in the distributor which sends a signal to the ignition module(ignitor) the module gives the pulse to fire the coil and injectors. the ecm provides power to the module and controls the distributor timing and injector pulse width. the Prom chip in the ecm is pretty much the program the ecm will run. when a truck won't start it's usually either 2 things. no fuel or no spark. if there is spark but not fuel it's almost always pump related. if theres fuel but no spark it's usually the coil or something else in the secondary ignition, wires, cap rotor ect. if the pump runs but there is no fuel or spark it is almost always the ignition module.