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How do i change spark plugs on 1999 grand marquis

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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.

Posted on Jun 06, 2010

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1 Answer

1999 mercury grand marquis electrical problems


check the ground frrom neg batt to frame. clean connection and tightn it and make sure the batt cable clamps r tight n still good

Feb 28, 2013 | 1999 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

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

1999 grand marqui, 4.6 lit. engin. what is the spark plug gap and torque.


Make: MERCURY
Model: GRAND MARQUIS
Year: 1999
Engine: V8 - 4.6L - FI - - GAS

Part Number: RS12YC
GAP : .054" (Original Equipment Manufacturer and/or Original Equipment Equivalent)

Hope this helps.

Oct 02, 2011 | 1999 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

MY 1999 GRAND MARQUIS HAS BEEN SITTING FOR 2 YEARS AND MAY HAVE SEIZED, WHAT DO I DO TO CORRECT PROBLEM


lets see clean spark pugs tips with fine sand paper, drain oil, change fuel filter, if gas in tank, put gas cleaner in tank.

Feb 17, 2011 | 1999 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

2 Answers

Removing Spark Plug Wires


pull one at a time to chnge them...change one put the new one on change another put it on and so on DO NOT take all of them off at one time!!!!!

Feb 16, 2009 | 2000 Mercury Grand Marquis

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