To answer your question directly, it is the second cylinder back from the front of the car on the driver's side of the engine. That is the #6 cylinder in a rear wheel drive FMC V8 of any type.
More cylinder configurations for Ford, Lincoln, and Mercury engines:
V10 Engine (RWD/AWD)(Passenger compartment)-- firewall --
5 - - - - -10
4 - - - - - 9
3 - - - - - 8
2 - - - - - 7
1 - - - - - 6
-- radiator --
(Front of car)
V8 Engine (RWD/AWD)(Passenger compartment)-- firewall --
4 - - - - - 8
3 - - - - - 7
2 - - - - - 6
1 - - - - - 5
-- radiator --
(Front of car)
V8 Engine (FWD)(Passenger compartment)-- firewall --
1 - 2 - 3 - 4
5 - 6 - 7 - 8
-- radiator --
(Front of car)
V6 Engine (RWD/AWD)(Passenger compartment)-- firewall --
3 - - - - - 6
2 - - - - - 5
1 - - - - - 4
-- radiator --
(Front of car)
V6 Engine (FWD)(Passenger compartment)-- firewall --
1 - 2 - 3
4 - 5 - 6
-- radiator --
(Front of car)
I6 Engine (RWD)(Passenger compartment)-- firewall --
6
5
4
3
2
1
-- radiator --
(Front of car)
V4 Engine (RWD)(Passenger compartment)-- firewall --
2 - - - - - 4
1 - - - - - 3
-- radiator --
(Front of car)
I4 Engine (RWD/AWD)(Passenger compartment)-- firewall --
4
3
2
1
-- radiator --
(Front of car)
I4 Engine (FWD)(Passenger compartment)-- firewall --
1 - 2 - 3 - 4
-- radiator --
(Front of car)
So, on all FMC engines, the #1 cylinder is always at the front of the engine (And on the left hand side of the engine in a V configuration).
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On a 2004 Mercury Grand Marquis : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
On a 1999 Mercury Grand Marquis : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle