Fuel Injector: Service and Repair

REMOVAL PROCEDURE

Tools Required
^ J 34730 Fuel Pressure Gauge
^ J 37088-A Fuel Line Quick-Connect Tools

NOTE: 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.

IMPORTANT: A fuel injector is serviced as complete assembly only. If the fuel injectors are leaking, the engine oil may be contaminated with fuel.




1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure. Service and Repair
2. Remove the fuel rail.




3. Remove the fuel injector retaining clips (2).
4. Remove the fuel injectors (3).
5. Remove the fuel injector upper O-ring (1).
6. Remove the fuel injector lower O-ring (5).

IMPORTANT: Fuel injector O-rings should always be replaced whenever fuel injectors are serviced.

Each fuel injector is calibrated for a specific flow rate. Use the correct part number when ordering replacement fuel injectors.

The fuel injector lower O-ring (5) uses a nylon collar, called the O-ring backup (4), to properly position the O-ring on the fuel injector. Be sure to reinstall the O-ring backup, or the sealing O-ring may move on the fuel injector when installing the fuel rail. If the sealing O-ring is not seated properly, a vacuum leak is possible, and driveability complaints may occur.

7. Remove the O-ring backup (4).

INSTALLATION PROCEDURE

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

The upper and lower fuel injector O-rings use different part numbers. To identify the correct O-ring, the upper O-ring is black and the lower O-ring is brown. Both O-rings are the same size but consist of different material.

The fuel injector lower O-ring uses a nylon collar, called the O-ring backup, to properly position the O-ring on the injector. Always reinstall the O-ring backup, or the sealing O-ring may move on the injector when installing the fuel rail, resulting in a vacuum leak.

The fuel injector O-rings should always be replaced whenever the fuel injectors are serviced.




1. Coat all new O-rings with engine oil before installing the O-rings.
2. Install the fuel injector backup O-ring (4).
3. Install the lower fuel injector O-ring (5).
4. Install the upper fuel injector O-ring (1).
5. Install the fuel injector to the fuel rail (3).
6. Install the fuel injector retaining clips (2).




7. Install the fuel rail.




8. Install the rear seat cushion.

NOTE: Refer to Fastener Notice in Service Precautions.

9. install the fuel injection sight shield.

Tighten
Tighten the nut to 2 N.m (18 lb in).