You have C.O.P ( coil on plug ). Just un clip the coil wire, remove the small screw and the coil is off. Spark plugs are under the coil's.
Beneath the coils. There are 8 coils. 4 on each side. Remove the coils (gently), then remove the plus.
There are 8 coils, each held on by one screw.
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
Change the coils .
On a 2000 Mercury Grand Marquis : The firing order is ( 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 ) The engine cylinder locations are numbered : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis , 4.6 It has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils
On the 2001 Mercury Grand Marquis , it has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils on the 4.6 liter SOHC , V8 engine ( it's not the same , as say , a 1997 Mercury Grand Marquis that had ( 2 ) coil packs with four towers on each coil pack and spark plug wires with the Electronic Distributorless Ignition System ( EDIS )
For a 1999 Mercury Grand Marquis : The firing order is ( 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 ) It has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils The engine cylinder locations are numbered : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
On a 1998 Mercury Grand Marquis : It has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils The engine cylinder locations are numbered : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle The firing order is ( 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 )
On a 1999 Mercury Grand Marquis : It has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils One coil for each of the eight spark plugs firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
Change coils.
On a 2000 Mercury Grand Marquis , 4.6 liter V8 engine : The firing order is ( 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 ) It has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils The engine cylinder locations are numbered : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
For a 1999 Mercury Grand Marquis : The firing order is ( 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 ) The 4.6 liter SOHC , V8 engine has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils The engine cylinder locations are numbered : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle