Test 9 - Fuel Injector Balance Test

Description:

TEST 9 - FUEL INJECTOR BALANCE TEST

IMPORTANT: If engine is at operating temperature. allow a 10 minute cool down period.

1. Before the Fuel Injector Balance Test is started, the electrical connector should be tested using a Noid Lite SA9194E.
a. Disconnect electrical connectors at fuel injectors.
b. Connect a Noid Lite to the female connector.
c. Crank the engine.
d. If the Noid Lite does not blink, the electrical problem must be corrected before continuing.
2. Remove air intake tube. Refer to Air Induction System Removal" procedures.


3. Connect Scan tool and turn ignition ON.
4. Perform Fuel Pressure Release procedure (refer to "Relieving Fuel Pressure).
5. Energize fuel pump (refer to "Energizing Fuel Pump").
6. Assure that fuel pressure is 276-379 kPa (45-51 psi) (1st Reading).
7. Using the Scan tool (refer to "Scan tool - Special Tests") pulse the #1 injector.
8. Record pressure at the instant the gauge needle stops moving (2nd reading).
9. Repeat steps 6 through 8 for the remaining three injectors.

NOTICE: The engine must be started after four cylinders have been tested to prevent flooding or internal damage.

10. Add all the 2nd Readings together and divide by 4 (this is the 2nd reading Average).
11. Subtract Average of 2nd Reading from each 2nd Reading to obtain the Difference.
12. An injector is faulty if the Difference is greater than ±1.5 psi (10 kPa).
13. Check that all fuel injector connectors are connected. Pull back to insure a positive engagement.
14. Remove fuel gage bar adapter from fuel pressure test port and recap it.
15. Install air intake tube.
16. Start engine and check for leaks.