REMOVAL & INSTALLATION
See Figures 1, 2 and 3
- Disconnect the negative battery cable.
- Properly relieve the fuel system pressure, as described earlier in this section.
- Remove the fuel rail, as outlined later in this section.
- Unfasten the fuel injector-to-rail retaining clip, then pull the fuel injector out of the rail.
- Use a small awl or equivalent tool to carefully remove the O-rings from each end of the injector. Discard the O-rings and replace with new ones during installation.
- Install new O-rings on each end of the injector.
- Lightly coat the upper and lower O-ring gaskets of the injector with clean engine oil.
- Install the injector in the cup on the fuel rail, then secure with the retaining clip.
- Install the fuel rail, as outlined later in this section.
- Connect the negative battery cable.
See Figure 4
- Unplug the injector electrical connector.
- Using an ohmmeter, test the injector resistance across the injector terminals. The reading should be approximately 12-15 ohms at 68°F (20°C).
- If the resistance falls outside specifications, replace the faulty injector.
- If the resistance is within specifications, proceed with the testing.
Place a 12 volt test lamp across the injector's electrical connector terminals. Watch the test lamp while cranking the engine and compare with the following:
- If the test lamp does not flash, check the power feed and ground circuits between the PCM and the injector connector. Refer to the wiring diagrams in Chassis Electrical for wire colors. If the circuits are faulty, repair them. If the circuits are OK, test the engine control system.
- If the test lamp flashes, proceed with the testing.
Check for fuel delivery at the suspect injector by removing the injector from the fuel rail and check for fuel and/or restrictions in the rail or injector fuel inlet. Compare your results with the following:
- If there is no fuel present at the injector, replace the plugged injector, or clean the restricted passage, as necessary.
- If there is fuel present at the injector, proceed with the testing.
- With the injector removed from the fuel rail, connect a 12 volt source to one terminal on the injector connector and a ground wire to the other terminal. The injector should "click" each time the ground wire is connected and disconnected to and from the terminal.
- If the injector "clicks," it is OK. If it does not "click," it must be replaced.