Fuel Injector: Testing and Inspection
FUEL INJECTOR INSPECTION (ON-VEHICLE)
1. Warm up the engine and let it idle.
2. Listen for operational sound of each fuel injector with a screwdriver or a sound scope.
NOTE: The best way to judge the performance of an injector is to compare its sound with the sound of other fuel injectors.
FUEL INJECTOR REMOVAL / INSTALLATION
WARNING: Fuel line spills and leaks are dangerous. Fuel can ignite and cause serious Injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Pressure Release Procedures".
1. Remove in the order shown in the figure.
2. Install in the reverse order of removal, referring to Installation Note.
1. Negative battery cable
2. Air cleaner housing
3. Fuel injector connector
4. Fuel hose and fuel pipe
5. Fuel distributor (RH)
6. Fuel distributor (LH)
7. Insulator
8. Accumulated connector
9. Spacer
10. Fuel injector
11. Pressure regulator
INSTALLATION NOTE FUEL INJECTORS
1. Install new O-rings.
2. Apply a small amount of clean engine oil to the 0-rings before installing them.
3. Verify that the fuel injector holder is clean.
4. Clean the holder with gasoline, if necessary.
5. Install the fuel injector squarely into the distribution pipe while turning it back and forth.
Aligning Injector Tab With Key-Way (Notch) In Fuel Rail:
6. Fit the fuel injector tab into the notch in the distribution pipe.
7. Install the harness.
Tightening torque: 2.5-3.6 Nm (22-31 in.lbs.)
FUEL LEAKAGE TEST
1. With the fuel injector assembly removed, install the fuel hoses as shown in the figure.
View: How To Run Fuel Pump With Jumper Wire:
2. Connect the data link connector terminals F/P and GND with a jumper wire.
3. Turn the ignition switch to ON and check for fuel leaks from the fuel distributor.
4. If fuel leaks, check the fuel injector 0-rings and fuel distributor for damage.
FUEL DISTRIBUTOR INSTALLATION
1. Install new fuel injector insulators.
2. Install the insulators, making sure that each is pressed in fully, and that it is not twisted or bent. Incorrectly installed insulators can cause rough idle.
FUEL INJECTOR INSPECTION
NOTE: It is not necessary to remove the fuel injectors to perform the following procedures.
INJECTOR RESISTANCE
1. Disconnect the fuel injector connectors.
2. Measure resistance of the injectors.
Resistance: Approx. 13.8 Ohms @ 20°C (68°F)
3. If not as specified, check continuity of the harness and check for poor connection.
4. If the harness is OK, replace the fuel injector.
FUEL LEAKAGE TEST
1. Remove the fuel distributor assembly from the intake manifold.
2. Connect the fuel hoses.
View: How To Run Fuel Pump With Jumper Wire:
3. Connect the data link connector terminals F/P and GND by using a jumper wire.
4. Turn the ignition switch to ON and check for fuel leaks from the fuel injectors.
Fuel leakage: Less than 1 drop/2 min.
5. If not as specified, remove the leaking fuel injector and check the 0-rings and fuel distributor for damage. Replace as necessary.
6. Install the fuel injector.
7. Turn the ignition switch to ON and check for fuel leaks from fuel injector.
8. If not as specified, replace the fuel injector.
VOLUME TEST
1. Remove the fuel injectors and fuel distributor assembly.
Injector Volume Test:
2. Connect the SST as shown in the figure.
WARNING: Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
Rotate Dial To Select Injector:
3. Measure the injection volume of each fuel injector by using a graduated container.
Injection volume: 48-56 cm3 (2.9-3.4 cu. in.)/15 sec.
4. If not as specified, replace the fuel injector.