Fuel Injector Balance Test with Special Tool: Notes

Fig 1: Performing Fuel Injector Balance Test With Special Tool

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	First Reading
2	Second Reading

Injector Balance Test Example (Typical)

Cylinder	1	2	3	4
1st Reading	324 kPa (47 psi)	324 kPa (47 psi)	324 kPa (47 psi)	324 kPa (47 psi)
2nd Reading	249 kPa (36 psi)	234 kPa (34 psi)	255 kPa (37 psi)	269 kPa (39 psi)
Amount of Drop	75 kPa (11 psi)	90 kPa (13 psi)	69 kPa (10 psi)	55 kPa (8 psi)
Average Range: 242-262 kPa (35-38 psi)	Injector OK	Faulty injector - too much fuel drop	Injector OK	Faulty injector - too little fuel drop