.054 inch - according to www.motorcraft.com - one of Fords websites
.044 inch ( for your 4.9 liter / 300 cubic inch straight 6 cylinder engine in a 1991 Ford truck , according to motorcraft.com )
for what size of engine ?
That would depend on which engine size you have
( .054 inch ) according to www.motorcraft.com
on top of the spark plugs in the intake manifold.
IT IS ATTACHED TO THE PUMP AT THE FRONT OF THE ENGINE
www.motorcraft.com shows .054 inch
.054 inch , according to ford parts . com ( the spark plug gap is also shown on the vehicle emission control information sticker in the engine compartment )
According to one of Fords websites : For a 1991 Ford Explorer , 4.0 liter V6 engine : ( the spark plugs are gapped at .054 inch )
The 1991 Ford Probe spark ignition module can be found on the firewall in the engine compartment. The ignition module will be on the drivers side of the firewall.
1987 Ford Truck F150 1/2 ton P/U 2WD 4.9L FI 6cylThe Spark Plug Gap.044 (In thousandths of an inch)
no, the ranger is quite a bit narrower than an f150