System Description
WARNING: This page is about a different car, the 2003 Saturn Ion 3, 2003 Saturn Ion 2, and 2003 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.
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 EXAMPLE (TYPICAL) .
FUEL INJECTOR BALANCE TEST 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 |