That depends on the year of the Ford Ranger 4.0 L V6 , Motorcraft.com shows : 1990 to 2000 - 4.0 L OHV - V6 engines as ( .054 inch ) 2001 to 2004 - 4.0 L SOHC - V6 engines as ( .065 inch ) 2005 - 4.0 L SOHC - V6 engine as ( .054 inch ) does not list 2006 and newer
.044 inch for the 3.0 liter in a 2002 Ford Ranger
.042-.046 In.
The 2.3 liter in the Ford Ranger from 1989 to 1997 and the 2.5 liter from 1998 to 2001 use ( 8 ) spark plugs
In a 1997 Ford Ranger : The 2.3 liter four cylinder with Fords twin plug ignition system has ( 2 coil packs ) and ( 8 ) spark plug wires for the eight sparkplugs The 3.0 liter and the 4.0 liter V6 engines have ( 1 coil pack ) and ( 6 ) spark plug wires for the six spark plugs
.044 inch
.042 - .046 inch
The 2.9 L V6 used in 1986 to 1992 Ford Rangers spark plug gap is ( .044 inch )
The 2003 Ford Ranger Owner Guide shows .052 inch to .056 inch spark plug gap for the 4.0 liter V6 engine
www.motorcraft.com shows the spark plug gap for a 1992 Ranger 2.3 L engine as ( .044 inch )
( .054 inch ) spark plug gap for the 4.0 L - OHV - V6 engine in a 2000 Ford Ranger ( according to motorcraft.com , one of Fords websites )
( .044 inch ) for the 2.9 liter V6 engine in a 1986 Ford Ranger
On a 1996 Ford Ranger , 3.0 liter V6 : Check the Vehicle Emissions Control Information ( VECI ) decal , located in the front of your engine compartment ( it will show the type of spark plug to use and the spark plug gap )