Fuel Pressure Test Port: Service and Repair

Area around fuel pressure connection with GM X-30A or equivalent.

REMOVE OR DISCONNECT:

1. Negative battery terminal.
2. Relieve fuel system pressure.
3. Fuel pressure connection and seal. Discard seal.

INSTALL OR CONNECT:

1. New seal on fuel pressure connection.
2. Fuel pressure connection in fuel rail. Tighten Fuel pressure connection assembly to 10.0 N-m (88 lb. in.).
3. Tighten fuel filler cap.
4. Negative battery terminal.
5. Turn ignition switch to the "ON" position for two seconds, then turn to the "OFF" position for ten seconds. Again turn to the "ON" position, and check for fuel leaks.
6. Perform the "Idle Learn Procedure." The ECM will need to relearn the IAC valve pintle position following battery reconnect.

Air Plenum And Fuel Rail Removal:

Fuel Pressure Connection:

REMOVAL:

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure, see FUEL SYSTEM PRESSURE RELIEF:
3. Remove intake manifold plenum, see INTAKE MANIFOLD PLENUM.
4. Clean area around the fuel pressure connection with GM X-30A or equivalent.
5. Remove the fuel pressure connection and seal, discard the seal.

INSTALLATION:

1. Place a new seal on the fuel pressure connection assembly.
2. Screw the fuel pressure connection assembly into the fuel rail and tighten to 10.0 N-m (88 lb. in.).
3. Check for fuel leaks:
a. Connect the negative battery cable.
b. With engine "OFF" and ignition "ON," check for fuel leaks.
c. Disconnect the negative battery cable.
4. Install the intake manifold plenum as per above procedure.

IDLE LEARN PROCEDURE: Any time the battery is disconnected, the programmed position of the IAC valve pintle is lost, and replaced with a default value. To return the IAC valve pintle to the correct position, perform the following procedure:

1. After restoring battery power, connect the Tech 1 "SCAN" tool.
2. Select "IAC SYSTEM," then select "IDLE LEARN" in the "MISC TEST" mode.
3. Proceed with idle learn as directed.
^ This procedure allows the ECM memory to be updated with the correct IAC valve pintle position, for the vehicle, and provide a stable idle speed.