Mopar 4891573AB Injector-Fuel

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Relieve system fuel pressure, then disconnect the cable from the negative terminal of the battery. Drain the engine coolant, followed by removing the throttle body/air intake plenum cover and the upper intake manifold. Next, remove the upper radiator hose and disconnect the fuel supply line from the fuel rail by squeezing the two tabs on the quick-connect fitting together and pulling up. Disconnect the fuel injector electrical connectors by pushing up on the lock, squeezing the tab on the same side of the connector as the lock, and pulling up. Remove the fuel rail bolts to detach the fuel rail, then carefully pull up on the fuel rail to disengage the injectors from their respective bores in the intake manifold, removing the fuel rail and injectors. Remove the injector retaining clips and detach the injectors from the fuel rail by pulling off each retaining clip, pulling out the injector, and removing the O-rings. Discard the old O-rings and replace them with new ones along with a new grommet. Installation is the reverse of removal, ensuring to tighten the fuel rail retaining bolts to the specified torque. Refill and bleed the cooling system, and when finished, start the engine to check for leaks at the fuel supply hose fitting at the fuel rail and at each injector.

Disconnect the battery cable and fuel injector electrical connectors. Detach the injector wiring harness and fuel delivery line quick-connect fitting. Remove the fuel rail mounting bolts and carefully pull up on the fuel rail. Remove the O-rings from each injector and replace with new O-rings and grommet. Install the injector retainer clip and push the injector into the mounting pipe. Tighten the fuel rail retaining bolts and check for leaks.

Disconnect the battery cable and fuel injector electrical connectors. Detach the injector wiring harness and fuel delivery line quick-connect fitting. Remove the fuel rail mounting bolts and carefully pull up on the fuel rail. Remove the O-rings from each injector and replace with new O-rings and grommet. Install the injector retainer clip and push the injector into the mounting pipe. Tighten the fuel rail retaining bolts and check for leaks.

With engine running, listen to injector sound with stethoscope or finger. Check injector electrical connector and test for voltage. If voltage, replace injector. Remove air cleaner, relieve fuel system pressure, disconnect battery cable, remove fuel pressure regulator. Remove Torx screw, pry off injector cap. Pry injector from throttle body, peel off O-rings. Place new O-rings on injector and cap, coat with oil. Insert injector into throttle body, align and tighten screws. Reconnect battery cable, start engine, check for leaks. Turn off engine, reinstall air cleaner.

With the engine running or cranking, listen to the sound from each injector with an automotive stethoscope and verify the injectors are all clicking the same. If you don't have a stethoscope, place the tip of as crew driver against the injectors and press your ear against the handle of the screwdriver. Also feel the operation of each injector with your finger. It should sound/feel smooth and uniform and its sound/feel should rise and fall with engine RPM. If an injector isn't operating, or sounds/feels erratic check the injector connector and the wire electrical connector. If the connectors are snug, check for voltage to the injector, using a special injector harness test light (available at most auto parts stores).