Search the internet just for 2001 4.6 ford expedition
SOURCE: 2001 ford expedition spark plug location
That's because they are hidden quite well. If you look at the engine, you'll see yellow plastic prongs (?) that look like spark plugs, but hook up to the silver tubing. That's the fuel injectors. BUT, right behind the yellow plugs, are black ones. The black one is the connector to the spark plug. The plug itself sits about 4 inches down into the block of the engine. They are a real pain, and from what I can tell, you only have decent access to the first 2-4 of them, then they get too far back and start going under the dash (you'll see what I mean when you get there).
SOURCE: firing order diagram for 1999 ford expedition 2wd
U didn't say what engine, so I picked the 4.6 which is the most common one.
SOURCE: firing order 2001 ford f150 4.6
the firing order is 1-3-7-2-6-5-4-8, cylinders are number right bank (passenger side) 1-2-3-4, left bank (drivers side) 5-6-7-8
SOURCE: looking for a diagram on the firing order for a 98
Firing order is
1-3-7-2-6-5-4-8 Passenger side of engine starting at front and going
back is 1-2-3-4 Driver's side starting at front going back is 5-6-7-8.
Hope this help (remember rated trhis help).
SOURCE: removed spark plug wirers need firing order Ford Expedition 1999
Several engine sizes there...
1999 Ford Expedition 4.6 liter SOHC V-8 VIN "6" 
1999 Ford Expedition 4.6 liter SOHC V-8 VIN "W"
1999 Ford Expedition 5.4 liter SOHC V-8 VIN "L"
Hope this help to solve it (remmeber comment and rated this).
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