Injector Leak Quantity

WARNING: REVIEW THE HIGH PRESSURE FUEL SYSTEM WARNING BEFORE BEGINNING SERVICE (Refer to FUEL SYSTEM - WARNING).

NOTE: If an injector is found to be out of specification, repeat this test procedure after the injector replacement. Hydraulic flow will take the path of least resistance and multiple failures may be identified.

Perform this test with the engine at operating temperature. This test will assist in determining a defective or internally leaking injector(s) is present by measuring the amount of fuel return.

1. Turn the ignition off.
2. Remove the engine cover (Refer to ENGINE - REMOVAL).
3. Disconnect the fuel return hoses at the top of the injectors.
4. Disconnect and block off the oil return line at the banjo bolt fitting of the fuel rail.
5. Disconnect the fuel rail solenoid.

Special Tool #9545:

6. Install the test vials onto the injectors and secure with the return hose clips.
7. Crank the engine for ten seconds while monitoring each inner test vial.

After ten seconds, a maximum of two graduation lines may be reached. If the level has exceeded the two graduation line, replace that effected cylinder's injector, clear the memory using the scan tool and retest. If the level did not pass the two graduation line limit, continue to the next step.

8. Turn the ignition off. Leave the test vials in place. Reconnect the fuel pressure solenoid. Disconnect the cam position sensor, start and idle the engine (680 rpm) for ten seconds.