According to the Haynes guide the gap is .054 inches
According to one of Fords websites : For the 1992 Mercury Cougar , 3.8 liter V6 engine : ( the spark plugs are gapped at .054 inch )
.054 inch
Same as the 1996 4.6L: .054
.054
Spark plug order? there is no such thing.
According to one of Fords websites : For a 1969 Mercury Cougar ( all factory available engine sizes ) ( .035 inch spark plug gap )
You can find the correct firing order for your 1987 mercury cougar at www.coolcats.com, it is a website dedicated to the cougar and thunderbird.
0.054 for 1999 to 2001 V6.
According to one of the Ford websites : For a 1988 Mercury Cougar , 3.8 liter V6 engine : ( the spark plugs are gapped at .054 inch )
The Spark plug location on the 2001 2.5 liter dohc is under the valve cover.
According to one of Fords websites : For the 3.8 liter V6 engine in a 1988 Mercury Cougar : ( the spark plugs are gapped at .054 inch )
.040 ========================================================== According to one of Fords websites : For a 1993 Mercury Cougar : The 3.8 liter V6 engine and the 5.0 , V8 have spark plugs gapped at : ( .054 inch )