In 1978, Ford redesigned the Bronco, making it a full-sized SUV based off the maker's popular F-series pickup -- from 1966 through 1977 the Bronco was a compact SUV. The Bronco continued alongside the F-series pickup, following all F-series redesigns. In 1997, Ford drastically changed the F-150, leading to the elimination of the Bronco and the birth of its replacement -- the Expedition. The 2002 Expedition had two engines available: a 232-horsepower, 4.6-liter V-8 and a 260-horsepower, 5.4-liter V-8. Both engines used a distributorless ignition system that had individual coil packs on each spark plug. Replacing these ignition coils is straightforward and requires only basic hand tools.
Instructions
- 1
Open the Expedition's hood and find the eight coil packs -- four on the left side and four on the right side of the engine -- just above the valve covers. The coil packs have a rounded top, are black in color and have a wiring harness plugging into each.
2Press and hold the locking button on one coil pack wiring harness, and pull upward on the wiring harness to unplug it.
3Remove the coil pack-retaining bolt, using a ratchet and socket, and pull the coil pack upward with a slight twisting motion to remove it. If the rubber boot from the base of the coil pack becomes stuck, use needle-nose pliers to pull it from the spark plug.
4Spread a small amount of dielectric grease around the inside of the rubber boot on a new ignition coil, using a small flat-head screwdriver. This prevents the rubber boot from sticking to the spark plug.
5Line the rubber boot up with the top of the spark plug, and press it onto the spark plug until it clicks into place. Hand-tighten the coil pack-retaining bolt, and torque the bolt to 3 to 5 foot-pounds, using a torque wrench and socket. Plug the wiring harness into the receptacle on top of the coil pack.
6Repeat Steps 2 through 5 to replace any other failed coil packs.
