See Figures 1, 2, 3, 4, 5, 6 and 7
- Properly relieve the fuel system pressure.
- Disconnect the negative battery cable.
- Remove the upper intake manifold.
- Tag, disconnect and plug the fuel lines.
- Unplug the fuel injector electrical connections.
- Loosen the fuel supply manifold (fuel rail) retaining bolts.
Make sure that the insulators do not get lost when removing the fuel injection supply manifold (rail).
- Remove the fuel injection supply manifold (fuel rail) and the insulators. The injectors will come off with the manifold.
- Remove the injectors from the fuel rail.
- Remove and discard the fuel injector O-rings and the insulators.
Always use new O-rings and insulators on the injectors when installing them.
- Install new O-rings and insulators on the fuel injectors.
- Engage the injectors to the fuel supply rail.
- Guide the injectors into their bores while installing the fuel supply manifold (rail) assembly.
- Install the supply manifold retaining bolts and tighten them to 14-17 ft. lbs. (19-23 Nm).
- Engage the injector electrical connections.
- Connect the fuel lines and install the upper intake manifold.
- Connect the negative battery cable.
- Turn the ignition key from ACC to ON several times without starting the engine and check for fuel leaks.
See Figure 8
Do not connect a test light to the injector harness, as this may cause damage to the Powertrain Control Module (PCM).
- Disconnect the engine wiring harness from the fuel injector.
This may require removing the upper intake manifold or other engine components.
- Measure the resistance of the injector by probing one terminal with the positive lead and the other injector terminal with the negative lead of an ohmmeter.
- The resistance should be 12-16 ohms at 68°F (20°C).
- If resistance is not within specification, the fuel injector may be faulty.
- If resistance is within specification, install a noid light and check for injector pulse from the PCM while cranking the engine.
- If injector pulse is present, check for proper fuel pressure.