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there is a coil on each one. remove the coil and there is the plug.
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 )
On a 1998 Mercury Grand Marquis : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
Each spark plug has a coil on the top. Just remove the coil.
Just remove the coil on top of the plug.
Under the coil on each cyl.
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
There are 8 coils, each held on by one screw.
Ignition coil D primary/secondary circuit
On a 1996 Mercury Grand Marquis with the 4.6 liter SOHC , V8 engine : There are ( 2 ) coil packs with ( 4 towers on each ) They are located at the front area of the engine , just follow the spark plug wires to each of the ( 2 ) coil packs
The heater core is behind the dash the passenger side of the car.
Could be coil spring or air bag spring system. You have to look.