Question about 2003 Mercury Grand Marquis

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95 mercury grand marquis firing order of spark plug wires

Changed spark plugs but think wires may be switched wrong, because vehicle is not staying on when started

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  • Anonymous Mar 20, 2014

    I need to see a spark plug wiring diagram.

  • Anonymous Mar 28, 2014

    Changed valve cover gaskets and now trys to start but wont

  • Anonymous Mar 31, 2014

    can it be straight from the package

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  • Mercury Master
  • 61,037 Answers

Go this page for firing order, u have 4.6 L V8
http://www.moddedmustangs.com/reference/firing-orders.php

Posted on Feb 16, 2009

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Related Questions:

1 Answer

Mis fire on no 5


Check compression, but make sure you put injector in the right spot. Also double check firing order. Also gap on plugs. Did you drop one maybe?

Feb 21, 2013 | 1995 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

Changed spark plugs and now the car hestitates and back fires


maybe the wires got mixed up? Check firing order against the diagram below.

jturcotte_647.jpg



jturcotte_646.jpg

Oct 16, 2011 | 1992 Mercury Grand Marquis

3 Answers

Some put plug wires on wrong and i dont know how to fix this


Firing order 1-3-7-2-6-5-4-8 --------- front ' 1 2 3 4 ' of ' 'distributorless ignition vehicle ' 5 6 7 8 2.image

Jun 10, 2011 | 1995 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

The engine misfires when accelerating


Depending on your Grand Marquis's mileage...it sounds like plug wires and plugs...(worn out) and or engine timing/firing order? If plug wires recently changed...the spark plug wires are in the wrong firing order...confirm the firing order from your local parts store by phone...and retrace each one...always start with #1 cylinder...hope this helps.

Apr 25, 2011 | 2000 Mercury Grand Marquis

1 Answer

2002 mercury grand marquis spark plug wire diagram


For the 4.6L V8:
Firing Order:
1-3-7-2-6-5-4-8
Cylinders:
(back of engine)
4-----------8
3-----------7
2-----------6
1-----------5
(front of engine)

Let me know if this helped...

Mar 15, 2010 | 2002 Mercury Grand Marquis

1 Answer

My car starts but will not stay running it is a


Check you've reinstalled the wires to the correct cylinders - if you've got this wrong, then you'll have problems.
Off hand, I'm afraid I don't know your cylinder order however - sorry, you'll have to check a manual for that one (unless someone else on here knows it off the top of their head?)
Hope this helps, Sherwin

Dec 29, 2009 | 1996 Mercury Grand Marquis

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