Question about 2004 Mercury Grand Marquis
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Posted on Jan 02, 2017
The 4.6 does not have an traditional distributor. This year engine should have two coil packs located on the front of each valve cover. Each coil pack controls four cylinders. Some of the plug wires will cross over the front of the engine in a wire loom on top of the alternator. The spark plugs are located down in the intake manafold. they run beside the fuel rail on each side of the intake manafold where it joins to each head. You will need an extention at least 8 to 10 inches long to get at the spark plugs. The plug wire fit snuggly into the intake manafold and have an extention on them that connects to the spark plug.
Posted on Jan 22, 2010
Testimonial: "thanks, that's just what i needed to know "
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.
Posted on Mar 30, 2010
Remove the Ignition Coils,one connector at a time
Spark-Plugs under them,do 1, then replace the coil
Need a 5" Plug socket. like a Snap-On item
Posted on Feb 22, 2011
If it's a 4.6 litre, they are really easy.........just trace the wires from the coil packs on the front left and right of the engine to the holes they plug into.
I always tape my plug socket to my extension so it will not be stuck down in the hole.The plugs are easily accessible.
Every plug I do one at a time.I loosen 3 turns ,remove the extension and socket,and then crank the engine to blow the debris up out of the hole.It doesn't matter if the engine fires ot starts,Just shut it off immediately and remove the plug all the way and replace it right then.
Setting the gap a hair(.004") more than specs will ensure you get the best gas mileage.ONLY .004"...no more than that. don-ohio
Posted on Oct 12, 2011
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