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Where are coil packs located on 1999 ford expedition 4.6 liter engine?

On a 1999 Ford Expedition with a 4.6L engine, the coil packs are located on top of the spark plugs, directly on the engine valve covers. There's one coil pack per two cylinders; so you'll have three coil packs in total. They're fairly easy to see once you open the hood.