GMC 55577403 Direct Fuel Injector Assembly

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For 2015 and earlier models, start by disconnecting the negative battery terminal and remove the engine cover if present. Relieve the fuel system pressure and then remove the air intake duct and air filter housing. Release the quick-connect fuel line fitting at the fuel rail; also, disconnect the EVAP purge line from the intake manifold, unclip electrical connectors from the fuel injectors and MAP sensor. Remove fuel rail mounting bolts as well as ground strap (if equipped). Fuel rail and injectors are removed as a single assembly making sure no O-rings were left inside injector holes. The retainer securing each injector to the fuel rail is removed, then pull out injectors. To reassemble, change old O-rings on each injector with new ones. Lubricate new injector O-rings with clean engine oil when installing them, then tighten fuel rail mounting bolts. Start engine, check for fuel leaks. For 2016 and later models, relieve the fuel system pressure and disconnect negative battery remote terminal. Remove oil filler cap and engine cover fasteners; lift up engine cover with valve cover insulator reinstalling oil filler cap if needed. Take out ignition coils and charge air cooler outlet hose. Disconnect harness connectors from both fuel rail and camshaft position sensor moving wiring harness aside. Remove sound insulator around high-pressure pump body of fuel pump area. With a flare-nut wrench, unscrew intermediate high-pressure line fittings between where they enter or exit from their respective cylinders' heads so that you can get access into removing bracket bolt which holds those lines together at this location while leaving nuts attached but without taking off any bolts connecting them together yet! Try loosening encapsulated bolt threads on such an engine block not trying to loosen them up too much though since these may cause further problems like stripping out their threads entirely just like any other kind of automotive fastener would presumably be possible instead given how tightly these two parts of any typical modern-day automobile engine are held together or even! Special demounting screws and support tools should be installed for the injectors. Use slide hammers to tap them upward gently in a very even manner ensuring that they don't tilt as they are being removed from their holes. Put assembly on workbench, then remove slide hammers and secure it in vise. Fasten special calibration tools onto these injectors turning them clockwise instead. Disconnect fuel injector electrical connector, take off support plate bolts, supports and also demounting screws specific injector under replacement; remove injector, replace its O-ring seal with new one and put it back into fuel rail. Support plate should be removed but leave at least one support assembly on each injector before installing Teflon combustion seals with kit provided by manufacturer, which involves removing these parts from all others as well; coat non-hardening thread locking agent over newly purchased fuel injector mounting bolts too before finally tightening this down securely within cylinder heads where old ones held fast previously? Make sure you observe cleanliness of injectors' bores inside head block completely free from any kind dirt whatsoever including oil residue left behind because after all didn't really want anything getting gummed up next time around when this happens again here nearly everyone else isn't likely going care much either! Calibration instruments must be disconnected from ends each of at time being inserted into bore just before lowering entire unit itself onto top side engine using fuel rail assembly being lowered by means lowering itself directly on top surface motor where such a procedure literally takes place within seconds rather than minutes otherwise might happen without any sort major problems arising during course thereof maybe could have been better off avoiding such an unpleasant situation altogether by not having had introduce some unnecessary complications along way since both parts finally ended up getting ruined anyhow!! Press down until they touch seats while starting several different sizes M6 through M8 depending upon what style bolt head requires holding place tight turn counterclockwise one time only clockwise until tight, lastly, repeat this process moving back forth in same order when it comes installation steps completed by reversing the removals look also ensure there aren't any fuel leaks once after starting-up engine.

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.