Jeep RL184085AC Injector-Fuel

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To relieve the fuel system pressure, disconnect the negative battery cable. If working on a V6 engine, remove the upper intake manifold or the air intake tube/resonator for a 2015 and later 2.4L engine. Disconnect the fuel delivery line quick-connect fitting and 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 remove it along with the injectors. Remove the O-rings from each injector and replace them with new ones coated in clean engine oil. Ensure the injector is properly seated in the mounting pipe. Reinstall the fuel rail and injectors, tightening the retaining bolts to the specified torque. Start the engine 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 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 remove it along with the injectors. Remove the O-rings from each injector and replace them with new ones coated in clean engine oil. Ensure the injector is properly seated in the mounting pipe. Reinstall the fuel rail and injectors, tightening the retaining bolts to the specified torque.

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).

Coat the new O-rings with clean engine oil and install them on the injectors. Install the injectors into the fuel rail and secure with the injector clips. Guide the injectors/fuel rail assembly into the injector bores on the intake manifold and tighten the fuel rail mounting bolts. After installation, turn the ignition switch to On to activate the fuel pump and check for fuel leakage.

With the engine running or cranking, listen to the sound from the injector with an automotive stethoscope or by touching the area of the throttle body above the fuel injector with your finger.

Remove the engine cover and the air inlet tube. Disconnect the fuel supply line and the electrical connectors from the fuel injectors. Detach the PCV hose and the air make-up hose. Remove the fuel rail mounting bolts and carefully pull and wiggle the injectors to remove them. Remove the fuel rail and injectors as a single assembly.

Remove the throttle body upper and lower bonnets. Detach the injector connector by compressing the lock tabs and lifting up. Remove the retainer and gently pry the center collar of the injector to remove it. Discard the centering ring and upper and lower O-rings. Lubricate and install the replacement O-rings and centering ring. Align the injector with the housing and install it, followed by the retainer. Attach the injector connector and reinstall the bonnets.

Symptoms may include fuel knock, poor acceleration and performance, low fuel economy, rough engine idle, and engine misfire.