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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 just brought my 91EB in for emissions testing. I failed on the CO portion at 25oo rpm. The rig is basically stock. The only mod that I have done was to add holes in the air box. Could this be the problem? I have just replaced most of the emmision parts trying to track down a over rich...
