According to one of Fords websites :
For a 1993 Mercury Grand Marquis , 4.6 liter V8 engine :
( the spark plugs are gapped at .054 inch )
The 1991 Mercury Marquis spark plug gap is .034. Most spark plugs will be pre-gapped by the spark plug manufacturer.
.054 is the gap for the Mercury Grand Marquis.
On a 1997 Mercury Grand Marquis : Check the Vehicle Emission Control Information ( VECI ) decal in the front of the engine compartment , for the type of spark plug used and the spark plug gap
Remove the spark plug wire from your 2001 Mercury Grand Marquis. Remove the spark plug with a 5/8 deep well socket, white turning it to the left. Reverse the process to put in the new spark plug.
According to one of Ford's websites : The spark plug gap for a 1993 Mercury Villager , 3.0 V6 is : ( .032 inch )
.040
Each spark plug has a coil on the top. Just remove the coil.
According to one of the Ford websites : For a 1993 Mercury Grand Marquis , 4.6 liter V8 engine : The spark plugs are gapped at ( .054 inch ) * confirm with the Vehicle Emission Control Information ( VECI ) decal located in the front of the engine compartment
According to fordparts.com the spark plug gap is ( .032 inch ) on a 1993 Mercury Villager with the 3.0 liter V6
need to know the spark plug gap for a 1979 Mercury Grand Marquis with 351 modified.
Remove the spark plug wires from your 2002 Mercury Grand Marquis spark plugs. Remove the spark plugs by turning them to the left with a deep well 5/8 socket. Reverse the process to install the new spark plugs.
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of 2002 Mercury Grand Marquis