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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
I have same problem with mine every year or so. Off the Vacuum Tee. You will most likely find a t with no hose. replace with vacuum cap. the rubber gets old and the vacuum and pressure causes them to pop off at start up. check all hoses and replace other caps. you'll be good as new.