SOURCE: gmc sub wont start 1996
Your fuel pump may be at the end of it's life and need to be replaced. Your going to have to check your fuel pressure at the shredder valve, to have the engine start you need 60 to 65psi. Any other readings will not start and under 55psi, engine will not run. It's common to hear the electric fuel pump working but the mechanical pump it self is worn out and can no longer provide the proper fuel pressure for your SEFI system. Good luck and keep me posted, be glad to help get you truck running again. Auto Zone has loner tool program and they will have the step by step instructions to get the job done.
SOURCE: 1996 gmc k1500 4x4 5.7 vortec motor no start keep
Replace the coolant sensor on the front of the intake manifold.The coolant sensors on this engine does go bad and wont set a check engine light. The sensor will read about -32 to 0 degrees when they do go bad. The computer thinks it is that cold and sends tons of fuel to the engine. If you try to start the engine with the throttle depressed to the floor it puts the fuel system in clear flood mode and wont fire the injectors. Engine will start then and run very rich. The coolant sensor has two wires on it and sometimes you need to replace the wiring pigtail going to it as the sensor can seep coolant into the connector and corrode the terminals. All the parts are available at pepboys and autozone or napa. Good luck
SOURCE: cant get no fire/replaced distributor
if i understand u correctly u replaced the distributor and cap if so i would start with making sure my pick up coil was installed correctlyand or replace it.i also would look at the possibility of it being a powertrain control module or neutral safety switch if this vehicle is equipt with one. hope ive been helpful
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