I go through the steps required to perform a fuel injection balance test on a GDI engine in a 2016 GMC Sierra / Silverado. 5.3L engine. L83.
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Fuel Injector Balance Test with Scan Tool
1: Ignition ON.
2: Command the Fuel Pump Enable ON with a scan tool.
3: Verify the fuel pressure is between 320580 kPa (4684 PSI) with the fuel pump running.
4: Verify the fuel pressure does not decrease greater than 34 kPa (5 PSI) within 1 minute.
5: With engine idling.
6: Verify the scan tool Fuel Rail Pressure Sensor 1 parameter is between 1.95.0 MPa (276725 PSI).
7: Select the Fuel Injector Balance function within the Control Functions menu of a scan tool.
NOTE: To perform this test, the engine speed must be between 6001000 RPM.
8: Select and test a Fuel Injector. Repeat for each Fuel Injector.
9: Obtain and record a pressure drop value for each Fuel Injector.
10: Add all of the individual pressure drop values except for the fuel injector suspected of being faulty. This is the total pressure drop.
11; Divide the total pressure drop by the number of fuel injectors that were added together. This is the average pressure drop.
12:Multiply the average pressure drop by 0.20. This is the acceptable variance from the average pressure drop of 20%.
13: Verify the difference between any individual pressure drop and the average pressure drop is not greater than the acceptable variance.
14: If greater than the acceptable variance
Replace the Fuel Injector.

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