TEST ACTION APPLICABILITY
4 Turn the ignition off.
Remove the Spark Plug.
Inspect the Spark Plug for the following conditions.
- Cracks
- Carbon Tracking
- Foreign Material
- Gap size out of specifications
- Loose or broke electrode
NOTE: Lightly tap the bottom of the spark plug on a solid surface. The
electrode in the spark plug should not move.
Were any of the above condition present?
All
Yes → Replace the Spark Plug.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 5
5 Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Install a fuel pressure gauge.
Start the engine and observe the fuel pressure reading.
NOTE: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Choose a conclusion that best matches your fuel pressure reading.
All
Within Specification
Go To 6
Below Specification
Go To 12
Above Specification
Replace the fuel filter/pressure regulator.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
6 NOTE: Before continuing visually and physically inspect the fuel delivery
system for external leaks or damage. Repair /replace as necessary.
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the
engine off. Before testing or servicing any fuel system hose, fitting or line,
the fuel system pressure must be released.
Install special 5/16 fuel line adapter tool #6539.
Attach a fuel pressure test gauge to the T fitting on the tool #6539
Start the engine and allow the fuel system to reach maximum pressure.
Turn the ignition off.
NOTE: Fuel specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Using special tool #C4390, Hose Clamp Pliers, slowly clamp off the rubber hose on
the Fuel Pressure adapter between the fuel pressure gauge and the fuel pump
module.
Monitor the fuel pressure gauge for a minimum of 5 minutes.
NOTE: The pressure should not fall below 241 KPa (35 psi)
Does the fuel pressure gauge fall below the above specification?
All
Yes → Replace the leaking Injector(s).
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 7
115
DRIVEABILITY - NGC
P0300-MULTIPLE CYLINDER MISFIRE — Continued
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