Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
you need to check the crank sensor plug.where it plugs into the harness.also check and clean the harness that plugs into the pcm[computer]...also,if it is getting hard to start even when it isnt raining..you may want to check the fuel presure,these must have no less then 60psi at all times
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REMOVAL PROCEDURE IMPORTANT: The CKP System Variation Learn Procedure will need to be performed wherever the Crankshaft Position (CKP) sensor is removed or replaced. Refer to CKP System Variation Learn Procedure .
INSTALLATION PROCEDURE IMPORTANT:
CIRCUIT DESCRIPTION When you turn ON the ignition, the vehicle control module Vehicle Control Module (VCM) energizes the fuel pump relay which powers the fuel pump ON. The pump remains ON as long as the engine is cranking or running and the VCM receives reference pulses. If there are no reference pulses, the VCM shuts the fuel pump OFF within 2 seconds after the ignition was switched to the ON position or if the engine stops. The VCM also turns ON the fuel pump for 2 seconds when you turn OFF the ignition.An electric fuel pump pumps the fuel through an in-line filter to the fuel meter body assembly. The pump attaches to the fuel level sender assembly inside of the fuel tank. The fuel pump provides fuel pressure above what is needed by the fuel injectors. The pressure regulator keeps the fuel available to the injectors at a regulated pressure. Unused fuel returns to the fuel tank by the fuel return pipe.
need help on a 1999 Chevy K3500 pickup with a 7.4 L