Spark Plugs: Notes
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1999 Mercury Villager, 1999 Mercury Mountaineer, 1999 Lincoln Navigator, 1999 Ford Windstar, and 1999 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If reusing originally installed spark plugs, reinstall them in original position. Some cylinders use platinum ground electrodes and some cylinders use platinum positive electrodes. Replacement platinum spark plugs are double platinum electrode spark plugs and are used for all cylinders.