Fuel Injector Balance Test

FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL






TEST DESCRIPTION

Steps 1-5:

Steps 6-8:

The numbers below refer to the step numbers on the diagnostic table.
3. The engine coolant temperature must be below the operating temperature in order to avoid irregular fuel pressure readings due to hot soak fuel boiling.
5. This step tests for an internal fuel leak. If the fuel pressure drops during this test, then an internal loss of pressure is indicated. The fuel pressure should reach a steady value.

Fuel Injector Balance Test Example (Typical):

6. If the pressure drop value for each fuel injector is within 10 kPa (1.5 psi) of the average pressure drop value, the fuel injectors are flowing properly. Calculate the pressure drop value for each fuel injector by subtracting the second pressure reading from the first pressure reading. Refer to the illustration.