You need to inspect the spark plugs on your Dodge Durango truck and likely replace them every 30,000 miles or two years, whichever comes first. The spark plugs are installed with the truck's ignition coils and need to be changed if they have been fouled by oil or carbon deposits or if the gap between the electrodes has been bent out of shape. On most Durango models, you need to remove each ignition coil to access the spark plugs. Work on one ignition coil and plug at a time.
Unplug the negative (black) cable from the truck's battery. Loosen the clamp nut with a wrench so you can unsnap the cable from the terminal.
Disconnect the ignition coil by removing its mounting bolts with a wrench, unplugging its electrical connector and lifting out the coil.
Blow all dust, dirt and other materials out of the spark plug hole using compressed air.
Insert your torque wrench, with an extension and spark plug socket attached, into the spark plug hole and unscrew the spark plug out by turning it counterclockwise.
Apply a thin coat of anti-seize compound to the threads of the replacement spark plug.
Thread the new spark plug into the hole by hand, then tighten it with the torque wrench.
Re-install the ignition coil in the engine with its mounting bolts and electrical connector.
Connect the negative battery cable after replacing all necessary spark plugs.
