1997 Ford Explorer 2WD / 4WD
4.0 liter SOHC V-6 VIN "E"
Firing order 1-4-2-5-3-6
cylinder # passenger side front to back 1-2-3
Cylinder # driver side front to back 4-5-6
Coil pack # passenger to drivers side firewall 1-2-3
coil pack #passenger to drivers side radiator 5-6-4
My bad LOL
1997 Ford Expedition 4WD
5.4 liter SOHC V-8 VIN "L
Firing order 1-3-7-2-6-5-4-8
Cylinder # passenger side front to back 1-2-3-4
Cylinder # drivers side front to back 5-6-7-8
Coil pack on the passenger side front rotate clock wise 1-6-3-5
Coil pack on drivers side front rotate clock wise 8-4-7-2
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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: 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).
SOURCE: need firing order diagram for a 5.4 ford
Check this diagram for 2003 Ford Expedition 4WD 5.4 liter SOHC V-8 VIN "L"...
Hope helps (remember rated this help).
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