REMOVAL & INSTALLATION
See Figure 1
Use care when removing the injectors to prevent damage to the electrical connector pins on the injector and the nozzle. The fuel injector is serviced as a complete assembly only. Since the injector is an electrical component, it should not be immersed in any type of cleaner.
- Disconnect the negative battery cable.
- Relieve the fuel system pressure. Refer to the fuel system relief procedure in this section.
- Remove the intake manifold plenum.
- Remove the fuel rail assembly.
- Disengage the electrical wiring harness.
- Disassemble the injector clip and discard it.
- Remove the injector O-ring seals from both ends of the injector. Save the O-ring backups for use on reassembly.
- Install the O-ring backups before installing the O-rings.
- Lubricate the new injector O-rings with clean engine oil and install them on the injector assembly.
- Install the fuel injector into the fuel rail injector socket with the electrical connectors facing outward.
- Install new injector retaining clips on the injector fuel rail assembly by sliding the clip into the injector groove as it snaps onto the fuel rail.
- Install the fuel rail assembly.
- Install the manifold plenum.
- Engage the electrical wiring harness.
- Connect the negative battery cable.
See Figure 2
This test requires the use of fuel injector tester J-34730-3 or its equivalent.
- With the engine cool and the ignition turned OFF , install the fuel pressure gauge to the fuel pressure connection. Wrap a shop towel around the fitting while connecting the gauge to prevent spillage.
- Disengage all the fuel injector electrical connectors. Engage the tester to one fuel injector.
- Turn ON the ignition and bleed the air from the pressure gauge.
- Turn OFF the ignition for ten seconds and then turn it ON again. This will bring the fuel pressure to its maximum pressure. Record this reading.
- Press the tester button and record the lowest pressure reading. Subtract this reading from the initial reading obtained and record the result.
- Connect the tester to each injector and repeat Steps 4 and 5.
- Pressure should fall between 56-62 psi (430 kPa). Replace any injector that does not meet these specifications.
See Figure 3