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Ask How to change spark plug on a 2003 grand marquis

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Posted on Jul 17, 2013

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Need close up picture of spark plugs in engine of 2003 mercury grand marquis


I think you when you need a picture ,you may be
best to leave the job to a repair shop

Use Google ---you will find a picture

Seldom can someone tell you how to
work on any product

Aug 27, 2013 | 2003 Mercury Grand Marquis

1 Answer

2001 mercury grand marquis reading code p305 misfire, spark plugs and coils changed


If you changed the #5 Coil then the code was wrong

You get lots of wrong codes on a ford, as a bad coil
spikes the pcm when grounding out to fire the coils
secondary side

Try putting the old coil back & walking the new one to
another cylinder,may take many days & many miles of
driving to get it fix,but better than a shop guessing, because
they hate fords

Jan 24, 2013 | 2001 Mercury Grand Marquis

1 Answer

Where are the coils on a 2003 grand marquis


the spark plug wires fit directly into the coils. just follow the wires to it which can be under the plenum

Jun 17, 2011 | 2003 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 located in a 2003 grand marquis


They are located on top of the heads next to the intake. Each cylinder has a Coil on it held down with a 7mm bolt

Apr 26, 2011 | 2003 Mercury Grand Marquis

1 Answer

How do I change the spark plugs? Where are they? On the side, or under the big cover?


Take the large plastic cover off, the spark plugs are in the top side of the valve covers, need to remove the coils, each sparkplug will have its own coil which is held in by a bolt, then use socket and extension and remove plugs.

Apr 04, 2011 | 2003 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

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