Mopar 4861238AB Injector-Fuel

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Tighten the fuel rail retaining bolts and check for leaks at the quick-connect fitting and the upper end of each injector.

Disconnect the fuel delivery line quick-connect fitting and disconnect the fuel delivery line from the fuel rail. Disconnect the fuel injector electrical connectors and detach the injector wiring harness mounting clips from the fuel rail. Remove the fuel rail mounting bolts and carefully pull up on the fuel rail to disengage the injectors from their respective bores in the intake manifold. Rotate each injector to disengage the retainer clip from the flange on the injector mounting pipe and remove it from the fuel rail. Remove the O-rings from each injector and install new O-rings. Before installing each injector into the fuel rail, install the injector retainer clip by sliding the open end into its slot in the injector. Then, push the injector into the mounting pipe until it seats.

Place new O-rings on the injector and a new O-ring on the injector cap. Coat the O-rings with a light film of engine oil. Insert the injector into the throttle body and place the injector cap onto it, aligning them properly. Rotate the cap and injector to line up the attachment hole, then tighten the screws securely. Reconnect the negative battery cable, start the engine, and check for leaks. Finally, turn off the engine and reinstall the air cleaner assembly.

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).