Testing the fuel injectors on the 4.0L Ford fuel injected engines in the Explorer, Aerostar, Ranger and Mercury Mountaineer can be quite a challenge since three of them are under the intake manifold plenum. Also, when they fail, they usually don't leave a specific fuel injector diagnostic trouble code (DTC). Although fuel injectors don't go BAD very often, they also don't last for ever and this little article will show you how to test them with a multimeter. As you're removing bolts, nuts and stuff from the intake plenum to remove it, place them in a container and away from the engine compartment.. I'm sure that you are already aware that the upper intake manifold plenum has to be removed to access half of the fuel injectors.

1After removing the intake manifold's plenum and placing clean rags in the open intake runners, disconnect all six fuel injectors from their electrical connectors. You don't have to test them all, but if you do have the intake manifold plenum off of the intake manifold, you might as well.
2Place your multimeter in Ohms mode and probe the metal male spade terminals inside the fuel injector with the multimeter leads. 3Measure the resistance of the same fuel injectors several times so that you can be sure of your multimeter's Ohms result.
Alright, with the resistance values of all six fuel injectors on paper, let's interpret your results.

What I have experienced is the PCM only registering a misfire code (P0300, P0301, P0302, P0303, P0304, P0305, P0306) or nothing at all. When done, write this Ohms value down and record the number of the cylinder that fuel injector belongs to, too.

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