Fuel Injector Balance Test: Notes
WARNING: This page is about a different car, the 2005 Suzuki Reno and 2005 Suzuki Forenza. However, it is still accessible from the selected car via links, so may be relevant.
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
FUEL INJECTOR BALANCE TEST SPECIFICATIONS
| 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(19psi) | 117kPa(17psi) | 124kPa(18psi) | 145 kPa (21 psi) |
| Amount Of Drop | 165kPa(24psi) | 179kPa(26psi) | 172kPa(25psi) | 151 kPa(22psi) |
| 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 |
WARNING:
The fuel system is under pressure. To avoid fuel spillage and the risk of personal injury or fire, it is necessary to relieve the fuel system pressure before disconnecting the fuel lines.
WARNING:
Do not pinch or restrict nylon fuel lines. Damage to the lines could cause a fuel leak, resulting in possible fire or personal injury.
NOTE:
In order to prevent flooding of the engine, do not perform the Injector Balance Test more than once (including any retest on faulty fuel injectors) without running the engine.