Jeep Fuel Injectors & Parts

Diagnosing a bad Jeep fuel injector is relatively simple. For starters, the most obvious tell-tale sign is a misfire, either in one or more cylinders. When checking for a faulty fuel injector, get the Jeep's engine to operating temperatures if you can. If it won’t start, you don’t have to worry about achieving operating temperatures.

Accessing the Jeep fuel injectors

As with all fuel injection systems, Jeep fuel injectors are buried beneath intake system. However, unlike some engine layouts, the fuel rail and injectors can be reached without removing the intake manifold.

Before starting work on any fuel injection system, always ensure it is depressurized. This can be done by pulling the fuel pump relay and then running the engine until it stalls. Alternatively, pressure can be released through the Schrader valve on the right side (as you face the engine) rail.

Removing the intake air duct and air box exposes the throttle body, intake manifold and fuel rails. The rails themselves are secured to the manifold with four bolts, two on each side. Before undoing these bolts the inlet fuel line should be disconnected. This done by first removing the securing metal clip, then using a special disconnect tool to separate the line from the rail.

With the fuel line disconnected all that remains is to unplug the electrical connectors on each injector. From here it is a straightforward job to lift out the rails to work on the injectors.