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Old 12-01-2010, 12:07 AM
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Join Date: Oct 2009
Location: Ohio
Posts: 16
Default Spark Plugs for 2000 MGM

I want to change the spark plugs in my 2000 Grand Marquis. Want use Autolite plugs. Thinking about double platinum APP 104. Any comments?

Car has 87K miles and I'm guessing it has the org. plugs.

Also any tips about changing plugs, I've never done it on a vehicle with single coil packs for each plug. I checked in the Haynes manual and it doesn't look too difficult.

The reason, I'm doing this is because the check engine light just started coming on and the car misses a bit especially in damp weather-- otherwise it runs just fine. The code said it was a "missfiire in #5 cylinder." I'm guessing it could be the spark plug boot, the plug or the coil pack. Are the plug boots these replacable? Will also use dielectric grease when I install boots on the new plugs.

Is there a way to check the coil pack with an ohm meter?

Also can I use the same spark plugs on a 2004 MGM?

Thanx for helping, this is a tremendous forum.
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Old 12-15-2010, 03:21 AM
Join Date: Oct 2008
Location: United States
Posts: 35

As far as a replacement plug, I use Bosch Platinum 4304 in my 01 MGM, and they work great. If you've never changed the plugs on this type of car before, it is simple, but there are a few things to watch out for.

You will have just enough clearance to get the boot out from under the fuel rail once you've removed the hold down bolt on each coil. Be careful when you get to number 8, (near firewall on driver's side) because it does not have as much room to work on, and you will need to make sure that you have your wrench on the coil hold down bolt, so that you don't strip the head of bolt. (I replaced mine with Allen bolts).

Once you have plug lose (do not use too much force when breaking lose) then you can use a length of 3/8 fuel line to help get the plugs in and out of their holes. Stick the hose over the end of plug, and guide it back down into hole. Use anti-seize compound, and do not over torque the new plugs!

You may want to go out to the junk yard and practice on a Crown Vic / MGM that is sitting out there, if you have any doubts.

Also, if you have a misfire on one of your cylinders, try moving the coil/boot from one cylinder to another to see if misfire moves with the coil. More than likely the misfire is being caused by an injector. I would take a look at the wiring harness plug on the injector for number five as a suspect.

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Old 08-26-2011, 11:27 AM
Junior Member
Join Date: May 2011
Location: Georgetown, Texas
Posts: 2

I have come to the conclusion that I don't need to work on my car any more because I just get angry and throw my wrenches.
Striking Wrench
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2000, 2004, anti, autolite, changing, coil, grand, marquis, mercury, mgm, packs, plugs, seize, spark, test

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