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Home >> Buick >> 2003 >> Century Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System Testing & Engine Component Tests - 3.1L >> Fuel Systems >> Fuel Injector Balance Test With Special Tool >> Test Description

Test Description

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 3  - Engine Coolant Temperature (ECT) must be below the operating temperature to avoid irregular fuel pressure readings due to hot soak fuel boiling.
  2. 6  - If the pressure drop value for each fuel injector is within 1.5 psi (10 kPa) of the average pressure drop value, the fuel injectors are flowing properly.
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