REMOVAL & INSTALLATION
See Figures 1 and 2
Before removal you should clean the fuel rail assembly. Use a special cleaner such as GM X-30 or an equivalent. Do not soak the rails in the solvent, follow the manufacturer's instructions.
- Disconnect the negative battery cable.
- Relieve the fuel system pressure.
- Remove the intake manifold plenum, as required.
- Disconnect the fuel feed and return lines at the fuel rail. Use a backup wrench, as required, to support the fuel rail tube fittings.
- Remove the fuel line O-rings and discard.
- Disconnect the vacuum line at the pressure regulator, then remove the regulator (if needed).
- Disconnect the fuel injector electrical connectors, then the coolant temperature sensor connector.
- Remove the fuel rail attaching bolts. Remove the fuel rail assembly. Note the location and routing of vacuum hoses around the fuel rail before removing the rail.
- Remove the injector O-ring seal from the spray tip end of each injector. Discard the O-rings.
- Lubricate new injector O-ring seals with engine oil and install on the spray tip end of each injector.
- Install the fuel rail assembly into the intake manifold. Tilt the rail assembly to install the injectors. Install the fuel rail attaching bolts and fuel rail bracket bolts. Tighten fuel rail attaching bolts.
- Connect the electrical connection to the coolant temperature sensor, then the injector electrical connectors. Rotate the injectors, as required, to prevent stretching the wire harness.
- Attach the main injector harness.
- Install new O-rings on the fuel feed and return lines. Connect the fuel lines and tighten.
- If removed, install the pressure regulator and connect the vacuum line.
- Install the intake manifold plenum.
- Connect the negative battery cable.
- Tighten the fuel filler cap.
- Turn the ignition switch to the ON position for 2 seconds, then turn to the OFF position for 10 seconds. Again, turn the ignition switch to the ON position and check for fuel leaks.
- If equipped with the 3.1L (VIN T) engine, perform the Idle Learn Procedure, as described in Routine Maintenance .