Crank, no start

Hi,

When you press the gas when starting a fuel injected vehicle, it shuts the fuel off to the engine to eliminate a flooding condition. Has the vehicle been starting normally since it started? If not, what is now happening and have any diagnostic trouble codes been retrieved?

Take a look at this from the manual:

Clear Flood Mode
If the engine floods, clear the engine by pressing the accelerator pedal down to the floor and then crank the engine. When the TP sensor is at Wide Open Throttle (WOT), the PCM reduces the fuel injector pulse width in order to increase the air to fuel ratio. The PCM holds this injector rate as long as the throttle stays wide open and the engine speed is below a predetermined RPM. If the throttle is not held wide open, the PCM returns to the starting mode.

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If this continues to happen, we need to confirm that fuel pressure is within the manufacturer's specs. A faulty regulator can cause pressure to be too high. Also, leaking fuel injectors can cause flooding as well.

Here is a link that explains how to check fuel pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the directions specific to your vehicle for testing. The directions are in the attached pics along with the specs.

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2002 Oldsmobile Truck Bravada 4WD L6-4.2L VIN S
Fuel System Diagnosis
Vehicle Power-train Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Testing and Inspection Component Tests and General Diagnostics Fuel System Diagnosis
FUEL SYSTEM DIAGNOSIS
SYSTEM DESCRIPTION
When you turn "on" the ignition switch, the control module enables the fuel pump relay which powers the fuel pump "on". The fuel pump remains "on" as long as the engine is cranking or running and the control module receives ignition reference pulses. If there are no ignition reference pulses, the control module shuts the fuel pump "off" within 2 seconds after the ignition was switched to the "on" position or if the engine stops.

The fuel tank stores the fuel supply. The electric fuel pump supplies fuel through an in-line fuel filter to the fuel injection system. The pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pressure regulator maintains the correct fuel pressure to the fuel injection system. A separate pipe returns unused fuel to the fuel tank.

TEST DESCRIPTION

Fuel System Diagnosis - Steps 1-3

See pic 1

Fuel System Diagnosis - Steps 4-11

See pic 2

Fuel System Diagnosis - Steps 12-17

See pic 3

Fuel System Diagnosis - Steps 18-22

See pic 4

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that the fuel pump is operating.
4. This step tests for an internal fuel leak. If the fuel pressure decreases during this test, then an internal loss of pressure is indicated.
7. This step inspects the fuel pressure regulator for a fuel leak from the atmospheric vent. If fuel leaks from the fuel pressure regulator while the fuel pump is commanded "on", replace the fuel pressure regulator.
8. This step tests for a loss of fuel pressure between the shut-off adapter on the fuel feed pipe and the fuel pump.
9. This step tests for a leaking fuel injector or fuel pressure regulator. If the fuel pressure remains constant during this test, the fuel injectors are not leaking fuel.
12. This step tests for a restricted fuel return pipe. If the fuel pressure is within the specified values, a restriction in the fuel return pipe is indicated.
14. This step determines if the fuel pressure regulator, or the fuel pump, is the cause of the low fuel pressure. If the pressure rises above the specified value, the fuel pump is okay.
16. This step verifies that a circuit condition is not the cause of a fuel pressure concern. Inspect all fuel pump electrical circuits thoroughly
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Let me know exactly what is happening now and if it's the same as before.

Take care,
Joe