Mopar 5037479AA Injector-Fuel

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Discard the O-rings, and install new O-rings lubricated with clean engine oil. Install the injectors into the fuel rail. After installation, activate the fuel pump by turning the ignition switch to ON without operating the starter. Repeat this step two or three times and check for fuel leakage.

Remove the engine cover and disconnect the fuel injector connector. Use a Digital Volt-Ohm Meter (DVOM) to measure the resistance between the injector terminals. If the injector is not within specification, replace it.

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

To replace the fuel injectors, start by relieving the fuel system pressure and disconnecting the negative battery terminal. For 3.6L V6 engines, remove the upper intake manifold. For 3.7L V6 and 4.7L V8 engines, remove the air intake duct and disconnect the fuel supply line. Label and disconnect any vacuum hoses and electrical connectors that may interfere with fuel rail removal. Remove the ignition coils and clean any debris around the injectors. Remove the fuel rail mounting bolts and gently rock the fuel rail to loosen the injectors. Remove the fuel rail and injectors as an assembly. For 5.7L and 6.4L HEMI engines, 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. To remove an injector from the fuel rail, 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. Finally, reinstall the fuel rail and injectors, and check for fuel leakage.