Jeep 5037479AB Injector-Fuel

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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.

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.

Remove the injector retainer clip and pull the injector out. Replace the O-rings and lubricate them before installing the injector back into the fuel rail.