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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
By design, the SOHC is more advanced and has a little bit more power -- but the design of multiple timing units makes the engine a bit more complicated. The OHV was deprecated a few years ago and the SOHC continued on in the 3rd gen Explorers.
It is the engine code: 8th digit of the VIN. The VIN is the unique series of alphanumeric characters stamped into a plate at the lower left corner of your front windshield which uniquely identifies your truck. No other vehicle anywhere in the world should have the same VIN.
Don't be sad, be aware. There are differences between the 4.0s and now that you know which one you have you know what to expect.
You know that you haven't got as much power output as the OHC engines pump out and you'll probably be burning a bit more gas than they do. On the up side, you can't possibly have been expecting to sip gas or win races when you chose to buy an Explorer so you shouldn't bee too disappointed.
It also means that you won't have to worry about intake gaskets and maybe can have fewer issues with electronics, cats, and will almost certainly have no non-obvious problems that ever make the truck fail to start.
When you consider the whole package, neither 4.0L is really better than the other. They are just a little different.