GM 12662564 Direct Fuel Injector Assembly

To remove the SL engine, first decrease the fuel system's pressure and disconnect the battery. Then, take off the engine cover, insulation and ignition coils. Detach fuel rail pressure sensor and individual injector connectors and move harness aside. Disconnect fuel rail harness connector and high-pressure fuel pipe. Take out screws for fuel injector assembly by either Method 1 or Method 2. Finally, remove injectors from the fuel rail by carefully prying apart assembly and pulling injectors away. For two-liter engines, disconnect high-pressure fuel pipe, remove intake manifold; disconnect Fuel Rail Harness & Pressure Sensor Connectors on 2B-1 page (if applicable). Remove mounting bolts of Fuel Rail and Upper Grommets; also separate Electrical Connector from Fuel Rail Harness .Undo bolts then work Fuel Rail & Injectors out of Cylinder Head. Detach electrical connectors for the fuel injectors and remove injector wire harness. When repairing injectors cut off Teflon seal from them. For installing Teflon seals use a kit to service fuel injectors then wrap lower injector seal groove in AC tape made of aluminum ducting material. Put a seal into place on Injector Body using Injector Service Tool; remove tape repeat steps for Lower Groove over again like setting it on fire! Compress seals by correct diameter compression ring! At last, tighten bolts ; check for leaks before starting engine after installing injectors plus put back them along with rails in cylinder head.

To remove the fuel injectors, relieve the fuel system pressure, disconnect the negative battery terminal, remove the upper intake manifold, and disconnect the fuel supply line and electrical connectors for the main fuel injector harness and each injector. Remove the fuel rails and injectors as an assembly, and release the fuel injector retaining clips to remove each injector. To install the fuel injectors, install the new upper and lower O-rings on the injectors, coat them with clean engine oil, insert them into the fuel rail and install the injectors and fuel rail assembly onto the intake manifold, tighten the mounting bolts, and reconnect the negative battery terminal.