Jeep 5184085AD Fuel Injector

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.

To perform an injector resistance test, remove the engine cover and disconnect the fuel injector connector. Use a DVOM to measure the resistance. If not within spec, replace it. For V6, relieve fuel system pressure and disconnect battery cable. Remove air intake duct and upper intake manifold. Disconnect fuel supply line and electrical connectors from injectors. Clean debris and remove fuel rail and injectors. Remove safety clips and O-rings. Coat new O-rings with oil and install. Install injectors into fuel rail and tighten bolts. For V8, relieve fuel system pressure and disconnect battery cable. Remove air intake duct and housing, disconnect PCV hose and fuel supply line fitting. Disconnect electrical connectors from all eight injectors. Remove injector retainer clip and pull injector out. Discard O-rings and install new ones. Install injectors into fuel rail and tighten bolts. Turn ignition switch to On to activate fuel pump and check for leakage.

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 a crew driver against the injectors and press your ear against the handle of the screwdriver. Feel the operation of each injector. Prior to installation, lubricate the O-rings with a light film of clean engine oil. Push the top of the injector straight into the fuel rail receiver cup, taking care not to damage the O-ring. Slide the open end of the injector clip into the top slot of the injector, onto the receiver cup ridge, and into the side slots of the clip. Install the fuel rail.

A leaking fuel injector can cause fuel knock, poor acceleration, low fuel economy, rough idle and misfire. It is recommended to have any checks on diesel fuel injectors done by a dealer service department or qualified diesel repair facility, as injector tests require special high-pressure testing equipment and adapters. Removing and installing the injectors requires expensive special tools, making it not recommended to attempt this job at home. It is generally more cost-effective to have this job done by a dealer service department or diesel specialist.