Question about 1990 Mercury Grand Marquis

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How do i know which spark plugs are right for my car?

I have a 1990 mercury grand marquis and i need a tune up and i need to know what parts to get!

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Auto zone has them. "autolite platinum ap2545",very cheap$$.

Posted on Dec 25, 2008

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1 Answer

Where does the top part of shock mount on 1990 mercury grand marquis?


Strut tower in plain site, if you open the hood,
should have 3 nuts to remove for top bearing plate

The rear ones may be in the trunk

Jan 22, 2013 | 1990 Mercury Grand Marquis

2 Answers

What is the gap for the spark plugs on a 1990 Mercury Grand Marquis?


That should be under the hood on the Federal
Emission Label

Any spark plug manufactures web site, has it next to
the plugs avail to fit your engine code

May 24, 2012 | 1990 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.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

May 16, 2011 | 2002 Mercury Grand Marquis

1 Answer

Tune up question


That depends on your definition of a tune up. You should clean an air filter annually or sooner if driving on dirt roads. At least by 30,000 mis. you should have a new air filter. New spark plugs should be put in by 60,000 to 100,000 miles depending on your driving conditions (length of trips, etc.). Also a fuel filter(s) should be on your list if you have not replaced it or them by this age. How many miles have you got on your car?

Feb 14, 2010 | 2003 Mercury Grand Marquis

1 Answer

I have a 1994 Mercury Grand Marquis... it pings on accelaration, do I adjust the timing and if so.. how ?


use a higher octane gassoline
sounds like u got a spark knock.
also check the tune up parts

Dec 13, 2008 | 1994 Mercury Grand Marquis

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