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Home >> GMC >> 2002 >> Yukon Base, 5.3 Z, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System (Bi-Fuel & CNG) >> Fuel Injector Balance Test With Tech 2 >> Test Description
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Test Description

The numbers below refer to step numbers in diagnostic procedure.

  1. 3

    Fuel pressure should be within specified range. If fuel pressure is not within specified range, see FUEL SYSTEM DIAGNOSIS (BI-FUEL & CNG) .

  2. 4

    Fuel pressure should reach a steady value. If fuel pressure does not stabilize, see FUEL SYSTEM DIAGNOSIS (BI-FUEL & CNG) .

  3. 5

    If pressure drop value for each fuel injector is within 2 psi (14 kPa) of average pressure drop value, fuel injectors are flowing properly. Calculate pressure drop value for each fuel injector by subtracting second pressure reading from first pressure reading.

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