gap is 42
5.4 eng spark plug setting is .052-.056
On the distributor cap
Check your underhood sticker, it should say.
.042 to .046 inch
( .044 inch ) according to fordparts.com
Check VECI label under hood!
( .050 inch ) - spark plug gap for 1986 Ford Mustang - 5.0 liter engine
.050 inch spark plug gap - 1986 Ford Mustang 5.0 L ( 302 )
According to one of the Ford websites : For a 1986 Ford LTD with the 5.0 litre / 302 cubic inch V8 engine : ( .050 inch spark plug gap )
The 2.9 L V6 used in 1986 to 1992 Ford Rangers spark plug gap is ( .044 inch )
.044 in. for the 2.9 V-6
According to one of Fords websites : The spark plug gap for the 2.3 litre four cylinder engine in a 1986 Merkur XR4Ti is ( .034 inch )