3rd from front on driver's side
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
A number 7 on a mark 8 is on the third one back on the driver's side.
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of V8 engine in a 1997 Ford Expedition
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Ford Expedition
On a Ford Expedition , 5.4 ( and 4.6 ) firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
On a Ford Expedition : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Ford Expedition
it means you need a new spark plug and probably a new coil for number 7
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Ford Expedition