GM 12609749
Injector

The first step to replace the fuel injector requires removal of the fuel meter body. Start by removing the injector retainer lock nuts before taking off the retainer. Be careful during fuel injector removal to protect the electrical connector terminals because the fuel injector requires complete assembly servicing. Electrical injectors must stay free of all liquids because submersion in cleaning agents will harm their functions and they should never undergo cleaning procedures. A small tip punch should be used to push downwards between the injector terminals while pulling the injector downwards until it comes out. Check that the chosen fuel injectors are compatible with the vehicle application before placing your order. The installation requires engine oil lubrication of new injector O-ring seals before fuel injector insertion within the fuel meter body injector socket. Place the injector retainer together with its lock nuts on the fuel meter body before securing both nuts to 3 Nm (27 lb in). You should install the fuel meter body as the last step.

The fuel injection replacement process starts with taking out the air cleaner outlet duct followed by pressure relief from the fuel system. You must disconnect the engine wiring harness connectors from the evap purge solenoid together with the MAP Sensor and Ignition Coil and fuel injectors while marking each connector for future assembly. Thoroughly separate the engine wiring harness clip from three essential elements - ignition coil bracket, heater hose bracket and positive crankcase ventilation (PCV) hose. The technician disconnects three fuel system connections: the Fuel Rail quick fitting of the chassis fuel feed pipe and the two quick fittings connecting evap tubing to the Intake Manifold and evap canister purge solenoid. Separate the evap canister purge solenoid retainer attached to the Fuel Rail then remove all Fuel Rail bolts and gently raise the Fuel Rail assembly to protect the injector electrical connector terminals and spray tips from damage. Disassemble the Fuel Injector retainers along with injectors while discarding both upper and lower o-ring seals. Before installation allow the engine oil to become semi-fluid before applying it onto the new o-ring seals of the injectors. Position the seals onto the injectors before placing them into the Fuel Rail. Place the Intake Manifold onto the Fuel Rail before pushing it down until full seating. Complete this task by tightening Fuel Rail bolts to 10 nm (89 lb in) and then reassemble the evap tube with purge solenoid and the chassis fuel feed pipe and evap tube quick connect fittings. After reinstalling the pcv hose you must fasten the engine wiring harness with its clip bolt torqued to 9 nm (80 lb in). After reinstalling the heater hose bracket and nut the technician should connect engine wiring harness connectors to Ignition Coil and MAP Sensor and evap purge solenoid before installing the engine wiring harness bracket nut tightened to 5 nm (44 lb in). The last step involves linking the negative battery terminal while powering up the ignition to search for leaks before reinstalling the air cleaner outlet duct.

Do not immerse them in any liquid solvent or cleaner, as this may cause damage; cleaning is not recommended.

Disconnect various engine wiring harness electrical connectors from components such as the EVAP purge solenoid, generator, MAP sensor, ignition coil, and fuel injectors, ensuring to mark the connectors for correct reassembly.

Secure them with the retainers.