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My 99 grand marquis needs coils replaced, over spark plugs. how do i do that?

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Unplug the coil on the plug your replacing, unbolt the coil there are 2 small bolts holding it in place twist and lift it from the plug re install. suggest you replace the plug as well. hope this helps

Posted on Mar 23, 2011

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1 Answer

Can you replace a spark plug on a 1999 Mercury Grand Marquis without pulling the AC


yes you can. the spark plugs are located on top of the motor under the fuel rails. it has coil packs on each cylinders. you need to unbolt the coil turn it then pull it out. its a tight fit but can be done. For more room you can puul the fuel rails. but can be done with. good luck

Oct 03, 2011 | 1999 Mercury Grand Marquis

1 Answer

What do spark plug wires for a grand marquis 2000 look like?


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.

Jul 31, 2011 | 2000 Mercury Grand Marquis

1 Answer

I got code PO 305 on a 2002 Mercury Grand Marquis, what is the spark plug wire part called, is it #5 coil, and should I replace the coil and spark plug and what should the spark plug be gapped at? Thank...


I got code PO 305 on a 2002 Mercury Grand Marquis, what is the spark plug wire part called
This will have a direct coil over ignition with a coil over each spark plug. The coil is the electrical part over the spark plug. The coil also has a rubber part that is called the boot or spark plug boot. The boots can be purchased separately but the coils will come with new boots.

is it #5 coil,

Have you checked to see if there is any spark coming out of the number 5 coil?



and should I replace the coil and spark plug and what should the spark plug be gapped at?

When was the last time the spark plugs where changed? It may be due for all the spark plugs to be changed. The spark plug gap is usually listed on the emissions sticker under the hood. It should be .050 - .056 or very close to that.

May 16, 2011 | 2002 Mercury Grand Marquis

1 Answer

Where are the spark plugs and how do i replace them on an 03 marquis LS


They are under the coils just above the valve covers. There are 8 coils, one for each plug. I suggest not using anti-seize on the threads, but you must use di-electric grease on the boots to prevent cross-fire. the Motorcraft plugs are good for 100,000 miles, and seem to work very well. be careful, there are not a lot of threads on the head (even fewer on 99-back) so don't over tighten them.

Aug 29, 2010 | 2003 Mercury Grand Marquis

1 Answer

How do i change spark plugs on 1999 grand marquis


Remove the coils one at a time and replace the plugs under them. The coils are tucked under the fuel rail but you don't have to remove the rail, the coils will come out.

Jun 06, 2010 | 2009 Mercury Grand Marquis

2 Answers

Where are the spark plugs located on a 2000 Mercury grand Marquis?


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.

Mar 30, 2010 | 2000 Mercury Grand Marquis

2 Answers

How do u change thr spark plugs


1.Remove engine shroud.
2. Unplug and unbolt ignition coils.
3. Remove coils. Plugs are under coils.

Jul 31, 2009 | 1998 Mercury Grand Marquis

1 Answer

What is an ignation tune up for a 99 Merc. Gnd.


A full ignition tune up would be new spark plugs and wires.A cap and rotor if it has those. Do any fuel system cleaning before changing the plugs.

Jun 22, 2009 | 2001 Mercury Grand Marquis

1 Answer

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.

Dec 19, 2008 | 2000 Mercury Grand Marquis

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