Look at the rear or side of the oil pan
Just remove the coil on top of the plug.
There isn't one. You have to remove the pan to drain
Unfortunately there is no drainplug on an automatic transmission fluid pan ( unless an after market drain plug has been installed ) You have to drop the pan
its at the bottom of the radiator
According to the 1998 Mercury Grand Marquis Owner Guide it has the Coil On Plug ( C.O.P. ) ignition system so there are ( 8 ) individual coils firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Grand Marquis
On the oil pan, bottom of the engine. Crawl under the car and look, you will find it.
On a 1998 Mercury Grand Marquis , 4.6 liter V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
Are you an idiot? Remove the drain plug, drain the oil, unscrew the filter, put on a new one, refill with oil. Who doesn't know that?
Each spark plug has a coil on the top. Just remove the coil.
.054 is the gap for the Mercury Grand Marquis.
Could be a bad coil, plug, or injector. Start with the coil first.
Which drain plug are you trying to locate?