Question about 1997 Mercury Grand Marquis

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1997 Grand Marquis will not start

My marquis will not start after the weather changes I put on new coil packs, spark plugs and wires and change fuel filter what else can I do to get it to start. It crank up for 4 days in a row but now it's hasn't started for 3 days

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  • 235 Answers

Change the idle air control valve.

Posted on Feb 20, 2009

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Why does my 97 Mercury Grand Marquis run roughly after changing spark plug wires and core pack?


you must take it for a ride about 1 hour its scary but your computer has to adjust then it will pur good luck

Mar 31, 2015 | 1997 Mercury Grand Marquis

1 Answer

Code p0304 misfire e 320 mercdes 1997 when you start car vibrates and when you are at stop sign. solution please


A code P0304 may mean that one or more of the following has happened: Faulty spark plug or wire Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector, Burned exhaust valve, Faulty catalytic converter(s), Running out of fuel, Poor compression, Defective computer.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs/wires). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if equipped). Otherwise, check the coil packs. Sometimes the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your catalytic converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Oct 21, 2013 | 1997 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

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

2 Answers

Own a 1997 mercury grand marquis. went to change the spark plugs and didn't see the normal rotor, sparkplugs, etc. where are the plugs located and how do i change them


The 4.6 does not have an traditional distributor. This year engine should have two coil packs located on the front of each valve cover. Each coil pack controls four cylinders. Some of the plug wires will cross over the front of the engine in a wire loom on top of the alternator. The spark plugs are located down in the intake manafold. they run beside the fuel rail on each side of the intake manafold where it joins to each head. You will need an extention at least 8 to 10 inches long to get at the spark plugs. The plug wire fit snuggly into the intake manafold and have an extention on them that connects to the spark plug.

Jan 16, 2010 | 1997 Mercury Grand Marquis

1 Answer

Changing plugs in '04 grand marquis.


The new system is called a DIS (digital ignition system). Plugs are changed the same as usual, just without the cap and rotor. Instead of a single coil, now the new system has COPs (Coil over plugs) installed, these are recommended to be replaced around 75000miles and they are costly. hopefully this helps

Aug 18, 2009 | 1993 Mercury Grand Marquis

1 Answer

2001 mercury grand marquis. Engine stutters or hesitates with jerking when lightly accelerating. Seems like an air, fuel, or spark delivery problem. At wide open throttle this problem is not as noticeable....


Start car and use a squirt bottle of water to wet the wires and coil, if you see it spark or run rough one or both are bad, repair the wires first as they are more common.

Aug 02, 2009 | 2001 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

1993 Mercury Grand Marquis Problem:


Well in my madness of trying to figure it out with mama wanting it fixed and fixed fast and it being Hot! outside. I set back in the cool air with drink in hand wishing she had to do it instead of me, thought about it and said Ahhhhh! Coil pack or wires. I chose "coil pack" The problem is gone, Mama is happy and the world is right once again.
Coil pack would heat up and then breakdown.

Jul 24, 2008 | 1993 Mercury Grand Marquis

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