( .044 inch ) - according to www.motorcraft.com
on top of the spark plugs in the intake manifold.
Only on the 4.2 liter V6 engine , the 4.6 liter and 5.4 liter are Coil On Plug ( C.O.P. ) ignition
According to the 2001 Ford F-150 Owner Guide : For the 4.2 liter V6 engine : ( the spark plugs are gapped at .052 to .056 inch ) * confirm with the Vehicle Emissions Control Information ( VECI ) decal in the front of your engine compartment
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
Check the Vehicle Emission Control Information ( VECI ) decal located in the front of the engine compartment ( it will show what type of spark plugs to use and the spark plug gap )
In a 1997 Ford F-150 : There were ( 3 ) engine sizes from the factory : A 4.2 liter V6 engine A 4.6 liter V8 engine ( which has two coil packs and spark plug wires ) A 5.4 liter V8 engine which has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils
you need to refraise this question as you cannot have a V6 straight engine either you have a V6, or you have a straight 6
( .054 inch ) for the 5.0 L - V8 engine and ( .044 inch ) for the 5.8 L - V8 engine ( Helpfull )
If the check engine light is flashing with the engine running , that means a spark plug misfire has been detected
According to the 1999 Ford F-150 owners manual : For all the engine sizes ( 4.2 liter V6 , 4.6 liter and 5.4 liter V8 engines ) ( .052 to .056 inch spark plug gap ) ** confirm with what is on the VECI ( Vehicle Emissions Control Information ) sticker in the engine compartment **
a/c compresser
Check the Vehicle Emission Control Information ( VECI ) decal located in the front of the engine compartment ( it will show the type of spark plugs to use and the spark plug gap )