How to Replace Spark Plugs on a 2005 Dodge 4.7 V-8

by Justin Cupler

In 1967, Chrysler -- the parent company of Dodge -- introduced a new engine, the 318-cubic-inch V-8. This engine lasted in Dodge's lineup through the 2002 model year. In 2003, the 4.7-liter V-8 replaced the 318 as the maker's entry-level V-8. The 2005 model year brought about the addition of an exhaust gas recirculation system and knock sensors to the small 4.7-liter. A total of three models of 2005 Dodges used the 4.7-liter engine: the Ram 1500, Dakota and Durango. Replacing the spark plugs on the 4.7-liter is the same on all three models, except that the Ram 1500's air intake tube needs to be removed.

Step 1

Check the gap on all eight new Mopar RC12MCC4 -- or equivalent -- spark plugs, using a spark plug gap tool. The Dodge 4.7-liter engine requires a spark plug gap of 0.038 to 0.042 inches. Exchange any incorrectly gapped plugs with new ones, as they are not adjustable.

Step 2

Loosen the clamp securing the air intake hose to the throttle body -- on the Ram 1500 only -- with a Phillips screwdriver. Pull the hose off the throttle body and position it aside.

Step 3

Locate the eight coil packs on the top of the engine, just above the valve covers.

Step 4

Unplug the coil pack wiring harness, by pressing the locking button on the harness and pulling the harness from the coil pack. Remove the bolt securing the coil pack to the engine, using a ratchet and socket. Pull the coil pack upward with a slight twisting motion to remove it.

Step 5

Remove the spark plug, using a ratchet, 6-inch extension and a spark plug socket. Pull the spark plug from the spark plug socket.

Step 6

Press a new spark plug into the spark plug socket until the rubber insert inside the socket secures the spark plug. Hand-tighten the spark plug into the engine, using the spark plug socket and 6-inch extension.

Step 7

Tighten the spark plug to 20 foot-pounds, using a torque wrench, 6-inch extension and spark plug socket.

Step 8

Coat the inside of the coil pack's rubber boot with dielectric grease. Set the ignition coil back on the spark plug and press it down until it clicks into place. Tighten the coil pack-retaining bolt to 5 to 6 foot-pounds, using a torque wrench and socket.