For a Ford Expedition , Ford F-150 : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
drivers side of engine , cylinder nearest firewall
FIREWALL 4 - 8 3 - 7 2 - 6 1 - 5 FRONT
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
Many Ford V-8's number 1 cylinder would be located on the passenger side bank most forward cylinder. It would be helpful to know which engine you have to be sure.
drivers side of engine , back cylinder ( nearest firewall )
no
On a Ford Expedition , Ford F-150 : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
Ford V8 engine : 4 - 8 3 - 7 2 - 6 1 - 5 front
FIREWALL 4 - 8 3 - 7 2 - 6 1 - 5 FRONT
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front