Fuel Injector Balance Test-Fuel Pressure Test

Fuel Injector Balance Test-Fuel Pressure Test

1. Install a fuel pressure gage.
2. Turn ON the ignition, with the engine OFF.

Important:
* The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.

* DO NOT start the engine.

Command the fuel pump relay ON with a scan tool.
* Observe the fuel pressure gage with the fuel pump commanded ON. The fuel pressure should be 345-414 kPa (50-60 psi).

• If the fuel pressure is not 345-414 kPa (50-60 psi), Refer to Fuel System Diagnosis. Component Tests and General Diagnostics

* Monitor the fuel pressure gage for one minute. The fuel pressure should not decrease more than 34 kPa (5 psi).

• If the fuel pressure decreases more than 34 kPa (5 psi), Refer to Fuel System Diagnosis. Component Tests and General Diagnostics

* Perform the Fuel Injector Balance Test with Special Tool or the Fuel Injector Balance Test with Tech 2. Fuel Injector Balance Test With Tech 2 Fuel Injector Balance Test With Special Tool