Fuel Injector: Service and Repair

MPFI Injector Assembly:

Fuel Injector Part Number Location:

Injector Installation:

REMOVE
^ Disconnect negative battery terminal.
^ Relieve fuel system pressure. (Refer to Fuel Delivery / Service and Repair.
Service and Repair
^ Intake manifold plenum.

NOTICE: Use care in removing injectors to prevent damage to the electrical connector pins on the injector, and the nozzle. The fuel injector is serviced as a complete assembly only. Since it is an electrical component, do not be immerse it in cleaner.

^ Fuel rail assembly.

DISASSEMBLE
^ Injector retainer clip.
^ Discard retainer clip.
^ MPFI injector assembly.
^ Injector O-Ring seals from both ends of injector and discard.

CAUTION: Each injector is calibrated for a specific flow rate. When replacing fuel injectors, order replacements with the identical part number as the old injectors.

ASSEMBLE
^ Lubricate new injector O-Ring seals with engine oil, and install on injector assembly.
^ New injector retainer clips on injector assembly.
^ Position open end of clip facing injector electrical connector.
^ MPFI injector assembly into fuel rail injector socket with electrical connectors facing outward.
^ Push in far enough to engage retainer clip with machined slots on rail socket.


INSTALL
Fuel rail assembly. Refer to Fuel Rail.

Inspect
^ Temporarily connect negative battery terminal.
^ 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.
^ Disconnect negative battery terminal.

^ Intake manifold plenum.

^ Tighten fuel filler cap.

^ Negative battery terminal.

IDLE LEARN PROCEDURE
Any time the battery is disconnected, the programmed position of the Idle Air Control (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:

^ Restore battery power.
^ Connect Tech I "Scan" tool.
^ Select "IAC SYSTEM," then select "IDLE LEARN" in the "MISC TEST" mode.
^ Proceed with idle learn as directed.

This procedure allows the Electronic Control Module (ECM) memory to be updated with the correct IAC valve pintle position, for the vehicle, and provide a stable idle speed.