Check this for 2003 Ford Expedition 4.6 liter V-8 VIN "W"...
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Since I don't know which engine you have check this. 03 ford Firing Orders
SOURCE: need the firing order diagram
The 4.6 L SOHC engine used in the 1997 F-150 has a spark plug firing order 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8
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 1997 ford expedition
1997 Ford Expedition 2WD - 5.4 liter SOHC V-8 VIN "L"
1997 Ford Expedition 4WD - 4.6 liter V-8 VIN "6"
Other engine sizes can find in Firing Order
Hope helped, remember rated this help. Good luck.
SOURCE: 2005 firing order Ford Expedition
drivers side all the way back. 1234 is on passagers side, 5678 drivers side.
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"
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