Fuel Injector: Testing and Inspection

FUEL INJECTOR INSPECTION
Operation check
1. Warm up the engine and let it idle.




2. Listen for the operational sound of each fuel injector with a screwdriver or a sound scope.
3. If no sound is heard, measure the fuel injector resistance.
4. If the fuel injector resistance is OK, check wiring to the fuel injector and the voltages of the PCM terminals 74, 75, 100 and 101.

Fuel injector resistance
1. Disconnect the fuel injector harness.




2. Measure the resistance of the fuel injector.

Resistance: 12-16 Ohms @ 20°C (68°F)

3. If not as specified, replace the fuel injector.

Volume test




1. Remove the fuel injectors together with the fuel distributor.
2. Fasten the fuel injectors firmly to the pipe with wire.

WARNING: Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.

SST:

3. Connect the SST to the battery and an fuel injector.
4. Check the injection volume with a graduated container.

Injection volumes: 47-68 ml (1.4-2.0 fl oz)/15 sec.

5. If not as specified, replace the fuel injectors.

Fuel leakage test




1. Remove the fuel injectors together with the fuel distributor.
2. Fasten the fuel injectors firmly to the pipe with wire.

WARNING: Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.




3. Connect PCM terminal No.80 and a ground by using a jumper wire and the SST.
4. Turn the ignition switch to ON.




5. Tilt the fuel injectors approx. 60 degrees and verify that there is no fuel leaks from the fuel injector nozzles.
Leakage specification
If there is more than one drop per 2 minutes, replace the fuel injector.
6. Turn the ignition switch to OFF and disconnect the jumper wire.

FUEL INJECTOR REMOVAL

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.




1. Negative battery cable
2. Fuel injector connector
3. Fuel hose
4. Pressure regulator
5. Fuel distributor
6. Fuel injector
7. Insulator

Tightening torque: 7.9-10.7 Nm (70-95.4 in.lbs.)

FUEL INJECTOR INSTALLATION
Install in the reverse order of removal, referring to Installation Note.

Delivery Pipe Torque:

Tightening torque:
A: 19-25 Nm (14-18 ft.lbs.)
B: 7.9-10.7 Nm (70-95.4 in.lbs.)




Installation note
1. Use new fuel injector 0-rings.
2. Apply a small amount of clean engine oil to the 0-rings before installing them.




3. Install new fuel injector insulators.
4. Install the fuel injectors.