Listed in the owner's manual and under the hood on a placard. Also the parts store where you buy the plugs can supply this info.
A V6 engine in a Mercury Sable takes ( 6 spark plugs )
spark plug gap on 2005 mercury sable 3.0 =========================================================== Check the Vehicle Emissions 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 )
According to one of Fords websites : For a 1992 Mercury Sable : The 3.8 liter V6 engine has spark plugs gapped at ( .054 inch ) The website does not show the 3.0 spark plug gap
On a Mercury Sable , V6 engine : firewall 1-----2-----3 4-----5-----6 front of vehicle > driver
were is the computer test plug on the 94 mercury sable ?
Check the Vehicle Emissions Control Information ( VECI ) decal , located in the front of your engine compartment ( it will show the type of spark plugs to use and the spark plug gap )
Check the Vehicle Emissions Control Information ( VECI ) decal located in the front of your engine compartment ( it will show what type of spark plugs to use and the spark plug gap )
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 )
Check the Vehicle Emissions 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 )
The proper plug for a 1999 Mercury Sable, with the 3.0 L is a Champion Platinum Plug no: 3408. Other brands work fine, but I don't have those numbers.
The 1991 Mercury Marquis spark plug gap is .034. Most spark plugs will be pre-gapped by the spark plug manufacturer.
pre-heat spark plug, if this works then replace it.