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Re: 2000 Mercury Grand Marquis
If the moisture was on the outside of the plug most likely water got into the hole. this causes high stress on the coil and causes them to break down. If the plug was replaced and the symptom returned i would replace the coil.
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Firing order 1-3-7-2-6-5-4-8 Cylinder locations: Passenger side starting
at front of engine and going to the rear: 1-2-3-4 Driver side front to
rear: 5-6-7-8 This actually for a 1996 model, but I should imagine it is the same.
This engine does not have wires. It has what is known as COP coil over plug. Each spark plug has its own ignition coil mounted on top of it. The boot portion is replaceable if needed. one small bolt should hold each one down and has a small connector on each.
Depending on your Grand Marquis's mileage...it sounds like plug wires and plugs...(worn out) and or engine timing/firing order? If plug wires recently changed...the spark plug wires are in the wrong firing order...confirm the firing order from your local parts store by phone...and retrace each one...always start with #1 cylinder...hope this helps.
There are eight COPs (coil-on-plugs) to remove. Using a 7mm or 9/32" socket, remove each bolt securing each COP to the intake manifold on top of the engine. Remove all eight COPs, and the spark plugs are underneath. When replacing the spark plugs, use only the proper Ford/Motorcraft plugs, even if they cost twice as much as the aftermarket ones. You will avoid further headaches this way. Hope this helps.
Generally check engine light problems have to be checked with a diagnostic tool. Under the dash would be a rectangular shaped plug with about 8 prongs, not sure exactly. That's normally where you would plug in the diagnostic tool.