Ford V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
firewall 1-----2-----3 4-----5-----6 front of Ford Escape > driver
passenger side of engine , rear cylinder ( nearest firewall )
On a Ford 302 cubic inch V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
Ford V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
On a Ford 302 cubic inch V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
On a 1994 Ford Ranger , 3.0 and 4.0 liter V6 engine : firewall 3 - 6 2 - 5 1 - 4 front of vehicle
On a 1997 Ford F-150 , 4.2 liter V6 engine : firewall 3 - 6 2 - 5 1 - 4 front of vehicle
On the pistons, in the block. If they are bad, it's time for an engine rebuild.
I was told the number 1 piston is at the back side of the motor closet to the passenger side.
On the Ford 2.9 liter V6 engine : firewall 3 - 6 2 - 5 1 - 4 front of vehicle
On a 1998 Ford Windstar , 3.8 ( and 3.0 ) liter V6 engine : firewall 1-----2-----3 4-----5-----6 front of vehicle > driver