Removal (3.1L & 3.4L)
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, 2003 Buick Regal, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the negative battery cable. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE . Remove the upper intake manifold. See appropriate article in ENGINES. Disconnect the engine fuel feed pipe at the fuel rail. See FUEL LINE DISCONNECT FITTINGS .
- Disconnect the engine fuel return pipe at the fuel pressure regulator. Remove the fuel feed pipe and fuel return pipe "O" rings. Disconnect the main injector harness electrical connector. To disconnect fuel injector connector, pull up the lock release of the fuel injector connector. Depress the lock tab and lift the connector from the injector. Disconnect all remaining fuel injector connectors.
- Remove the injector electrical harness from the fuel rail. Disconnect the engine coolant temperature sensor electrical connector. Remove the fuel rail retaining bolts.. Remove the fuel rail assembly. Remove the injector "O" ring seal from the spray tip end of each injector. Discard the lower "O" ring seals if damaged.
- To remove injector(s) from the fuel rail, remove the fuel injector retainer clip. Remove the fuel injector from the fuel rail. Remove and discard the fuel injector upper "O" ring.