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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 Special Tool

Fuel Injector Balance Test with Special Tool

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. Set the amperage supply selector switch on the fuel injector tester to the Balance Test 0.5-2.5 amp position.
  2. Connect the J 39021  , the J 39021-210  and the J-39021-450  to the fuel injector multi-way connector. See Special Tools .
  3. Command the fuel pump relay ON and then OFF with a scan tool.
  4. Record the fuel pressure indicated by the fuel pressure gage after the fuel pressure stabilizes. This is the first pressure reading.
    5. IMPORTANT: The fuel pressure may rise after the fuel injector stops pulsing. Record the fuel pressure value immediately after the fuel injector stops pulsing. DO NOT record the higher fuel pressure value.
  5. Energize the fuel injector by depressing the Push to Start Test button on the fuel injector tester.
  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. Repeat steps 2-6 for each fuel injector.
  8. Perform the Pressure Drop Calculation.
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