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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
You can pull the valve off and try cleaning it with a good quality carb cleaner. Look closley to make sure there isn't any bad carbon build up or pieces lodged in the valve seat. If a quick clean doesn't fix it (or its got a ton of carbon build up) replacement is your only option.