Fuel Injector: Service and Repair

Sequential Multiport Fuel Injector Replacement

Removal Procedure

Caution: Refer to Battery Disconnect Caution in Cautions and Notices.

1. Disconnect the negative battery cable.

Notice: Use care in removing the fuel injectors in order to prevent damage to the fuel injector electrical connector pins or the fuel injector nozzles. Do not immerse the fuel injector in any type of cleaner. The fuel injector is an electrical component and may be damaged by this cleaning method.

2. Relieve fuel system pressure. Refer to Fuel Pressure Relief Service and Repair.
3. Remove the intake manifold plenum.
4. Disconnect the fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement Service and Repair.

Disassemble Procedure

Diagram:

1. Disconnect the electrical wiring harness
2. Remove the injector retainer clip (1) and discard.
3. Remove the fuel injector assembly (3).

Important: When ordering new fuel injectors, be sure to order the correct injector for the application being serviced.


4. Remove the injector O-ring seals (2, 5), from both ends of injector and discard. Save the O-ring backups (4) for use on reassembly.

Assemble Procedure

Diagram:

1. Ensure that O-ring backup (4) is on the injector before installing new O-rings. Lubricate the new injector O-ring seals with clean engine oil and install on the injector assembly.
2. Install the fuel injector assembly (3) into the fuel rail injector socket with the electrical connectors facing outward.
3. Install the new injector retainer clips (1) on the injector fuel rail assembly by sliding the clip into the injector groove as it snaps onto the composite fuel rail.

Installation Procedure

1. Install the fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement Service and Repair.
2. Install the intake manifold plenum.