n01tk
New Member
My C3500 will not lite up quickly after sitting ( 24hrs). I installed a new fuel filter, pump, lines and TBI ( rebuilt) This truck has the long fuel pump run time (~20 secs) to ensure vapour lock doesn't occur. I installed a fuel pressure gauge and get 11 psi ( gauge cal. checked). The gauge stays steady when increasing trottle. Installed a node light on injectors and both are pulsing when truck is cranking. Looked down tbi troat of the TBI and could see fuel in intake manifold. Turned my attention to spark. Repaced coil. Checked output, above 40,000 volts. Wires, cap, plugs and rotor button replaced < 1,000 mile ago. At that time removed ign. module, cleaned grounds and replaced module with thermal conductive grease applied.
This truck runs very smoothly when it does start and goes into closed loop when temp is achieved. Checked TPS and ECT sensors, both appear to be OK. The IAC counts are 35, which indicate no vacum leaks.
I am now wondering if the fuel is being sucked into the cylinders, but my vac appears to be OK? Running out of ideas. All help greatly appreciated:mad2:
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This truck runs very smoothly when it does start and goes into closed loop when temp is achieved. Checked TPS and ECT sensors, both appear to be OK. The IAC counts are 35, which indicate no vacum leaks.
I am now wondering if the fuel is being sucked into the cylinders, but my vac appears to be OK? Running out of ideas. All help greatly appreciated:mad2:
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