1997 Mercury Grand Marquis Owner Guide 1st Printing - Page 252
1997 Mercury Grand Marquis Manual
Page 252 highlights
Capacities and Specifications Refill Capacities, Motorcraft Parts, and Lubricant Specifications Motorcraft Parts If a spark plug is removed for examination, it must be reinstalled in the same cylinder. For 4.6L (2V) engines: Cylinders #1, #2, #3, #4 have a PG suffix. Cylinders #5, #6, #7, #8 have a P suffix. If a spark plug needs to be replaced, use only spark plugs with the service number suffix letter as shown on the engine decal. 253
253
Capacities and
Specifications
Refill Capacities, Motorcraft Parts,
and Lubricant Specifications
Motorcraft Parts
If a spark plug is removed for examination, it
must be reinstalled in the same cylinder.
For 4.6L (2V) engines:
Cylinders #1, #2, #3, #4 have a PG suffix.
Cylinders #5, #6, #7, #8 have a P suffix.
If a spark plug needs to be replaced, use only
spark plugs with the service number suffix letter
as shown on the engine decal.