System Description
The scan tool is first used to energize the fuel pump relay. The fuel injector tester is then used to pulse each injector for a precise amount of time, allowing a measured amount of fuel into the manifold. This causes a drop in system fuel pressure that can be recorded and used to compare each injector. See FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL EXAMPLE (TYPICAL) .
FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL EXAMPLE (TYPICAL)
| Condition | Cylinder No. 1 | Cylinder No. 2 | Cylinder No. 3 | Cylinder No. 4 |
|---|---|---|---|---|
| 1st Reading | 55 psi (379 kPa) | 55 psi (379 kPa) | 55 psi (379 kPa) | 55 psi (379 kPa) |
| 2nd Reading | 42 psi (290 kPa) | 45 psi (310 kPa) | 48 psi (331 kPa) | 46 psi (317 kPa) |
| Amount Of Drop | 13 psi (89 kPa) | 10 psi (69 kPa) | 7 psi (48 kPa) | 9 psi (62 kPa) |
| Average Range: 8-11 psi (57-77 kPa) | Replace Fuel Injector - Too Much Fuel Pressure Drop | Injector Okay | Replace Fuel Injector - Too Little Fuel Pressure Drop | Injector Okay |