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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Engine Controls - 3.9L - Troubleshooting & Diagnosis) >> Fuel Injector Diagnosis >> Component Testing >> Fuel Injector Balance Test with Tech 2

Fuel Injector Balance Test with Tech 2

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. With a scan tool, select the Fuel Injector Balance Test function within the Special Functions menu.
  2. Select an injector to be tested.
  3. Press Enter to prime the fuel system.
  4. Record the fuel pressure indicated by the fuel pressure gage after the fuel pressure stabilizes. This is the first pressure reading.
    5. IMPORTANT: Record the fuel pressure value immediately after the fuel injector stops pulsing. The fuel pressure may rise after the fuel injector stops pulsing. DO NOT record the higher fuel pressure value.
  5. Energize the fuel injector by depressing the Pulse Injector button on the scan tool. This will energize the injector and decrease the fuel pressure.
  6. Record the fuel pressure indicated by the fuel pressure gage after the fuel injector has stopped pulsing. This is the second pressure reading.
  7. Press Enter again to bring you back to the Select Injector screen.
  8. Repeat steps 2-7 for each fuel injector.
  9. Perform the Pressure Drop Calculation.
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