Fuel Injector Balance Test with Special Tool: Notes
CAUTION:
Refer to Relieving Fuel Pressure Caution
in Cautions and Notices.
NOTE:
Refer to Nylon Fuel Lines Notice
in Cautions and Notices.
NOTE:
Refer to Fuel Injector Balance Test Notice
in Cautions and Notices.
A fuel injector tester is used to energize the injector for a precise amount of time, thus spraying a measured amount of fuel into the intake manifold. This causes a drop in the fuel rail pressure that can be recorded and used to compare each of the fuel injectors. All of the fuel injectors should have the same pressure drop.
Fuel Injector Balance Test Example
| Cylinder | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| First Reading | 296 kPa (43 psi) | 296 kPa (43 psi) | 296 kPa (43 psi) | 296 kPa (43 psi) |
| Second Reading | 131 kPa (19 psi) | 117 kPa (17 psi) | 124 kPa (18 psi) | 145 kPa (21 psi) |
| Amount Of Drop | 165 kPa (24 psi) | 179 kPa (26 psi) | 172 kPa (25 psi) | 151 kPa (22 psi) |
| Average Range: 156-176 kPa (22.5-25.5 psi) | Injector OK | Faulty Injector - Too Much Pressure Drop | Injector OK | Faulty Injector - Too Little Pressure Drop |