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Best Spark Plugs for Mercury Grand Marquis 2023 | Top 3 Picks

Best Spark Plugs For Mercury Grand Marquis

The spark plugs enhance the engine power for a long and high-speed run. Most of the consumers such as the street racers are conscious enough to use quality spark plugs. They want to use spark plugs that have manufactures like copper, platinum, and iridium. 

Best Spark Plugs For Mercury Grand Marquis

For Mercury Grand Marquis automobiles, you should use the best spark plugs. Due to the high horsepower engine, this brand requires such strong spark plugs to generate quick energy. Let’s have a look at the best spark plugs for Mercury Grand Marquis and their specialties.

Top 3 Best Performance Spark Plugs for Mercury Grand Marquis Reviews in 2023

#1. NGK G-Power Platinum Alloy Spark Plug

NGK 3403 G-Power Platinum Alloy Spark Plug TR55GP

The NGK brand is one of the largest spark plugs manufacturers around the world. Its G-power platinum material generates a durable performance for an engine. In order to improve the performance of this spark plug, the price range is competitive and affordable. 



The platinum electrode tip of the NGK 3403 spark plug enhances the efficiency of the consistent start of an engine. Besides, the insulation of metal and copper generates multiple sparks in the vehicle engine to work fast. Also, the iridium-built plugs allow reducing fuel usage to improve the emission system.


In this Alloy spark plug, you will find the use of advanced cutting-edge technology to maximize engine performance. Additionally, the self-cleaning temperature optimizes the engine running system to run for a long time.


Without any doubt, the GK 3403 G-Power Spark Plug has high durability. It works under extreme heat and helps to run the engine in a short time.


  • Constructed with durable material
  • Work under extreme heat
  • Platinum electrode tip
  • Long durability
  • Improve fuel mileages
  • Tapered seat style
  • Installable without anti-seize spray
  • Reduce required voltage
  • Projected insulations


  • After getting old may misfire

#2. Motorcraft AGSF32PM Spark Plug – Compatible with 1998-2008 MERCURY GRAND MARQUIS

For Mercury Grand Marquis automobiles, Motorcraft has manufactured spark plug SP-493. Moreover, this spark plug is a perfect match for Ford and Lincoln brand motors. Due to its economical fuel cost and quick acceleration, professional racers love to choose it.



The center electrode tip of the Motorcraft spark plug helps to generate full voltage to reduce misfires. Besides, the double-platinum electrodes deliver a quick start to the engine. You just love to explore the interval up to 100,000 miles from this spark plug too. And the nickel-plated shell includes the corrosion resistance performance.


The inclusion of copper in the core center electrode and nickel in the core ground electrode enhances durability. Also, you will find the inclusion of platinum in the center electrode tip. This platinum helps to increase the strength of the plug. 


The size of this spark plug is about 2x4x5 inches only with 1.6 ounces of weight. Along with the dimension, this spark plug can reach up to 0.679 inches with the tapered type of seat.


  • Corrosion resistance
  • Platinum center electrode tip
  • The copper center electrode core
  • Reduce misfires
  • Quick start
  • 600,000 – 100,000 miles interval
  • Enhance fuel economy
  • Multiple rib insulator
  • Double platinum plugs


  • The engine may misfire due to the improper gap

#3. NGK Iridium TR55IX Spark Plugs for Mercury Grand Marquis

NGK Iridium IX Spark Plugs TR55IX # 7164

NGK Iridium serves corrosion-resistant spark plugs to develop an excellent acceleration performance. The taper cut ground electrode improves the flame expansion area with an enthusiastic response. Additionally, the Iridium TR55IX technology makes a motorbike engine with consistent sparks.



Due to the quick flame expansion, you will experience immediate acceleration from the engine. Also, this spark plug improves the fuel economy of a vehicle to deliver long mileage. 


The dimension of this spark plug is about 3.3x1x5 inches which includes 0.16 ounces of weight. Also, the fine wire with the center electrode allows sustainable performance.


The corrosion-resistant metal of this spark plug can perform at 2000 degrees Celsius. Besides, you can experience 500,000 miles intervals on average for the Iridium spark plug. Additionally, many of the iridium spark plugs perform up to 800,000 miles intervals.


  • Improve the acceleration
  • Wide flame expansion
  • Corrosion-resistant
  • Nickel alloy ground electrode
  • Copper center electrode
  • Triple seal to prevent leakage
  • Insulator of alumina cilicate ceramic
  • Firewire center electrode
  • Trivalent metal plate
  • Improve fuel economy


  • Price little bit costly

How do you change the spark plugs on a 1995 to 2006 Mercury Grand Marquis?

How Do You Change The Spark Plugs

How do you change the spark plugs on a Mercury Grand Marquis?

Changing a spark plug on the Mercury Grand Marquis is not a difficult task to do. But, you need to know the perfect process for the replacement of a spark plug. Here we will discuss the procedure of changing the plug step by step below:

Step 1: Checking the gap

First of all, you have to check the gap of the base with a spark plug gap tool. Generally, a Grand Marquis engine has a 0.052 to 0.056 inches gap for the spark plug.

Step 2: Removing Screw and Hose

Then you need to remove the screw from the center rear of the cover. Also, you need to remove the hose from the air cleaner to lose the clamp.

Step 3: Removing Coil Pack

After removing the hose and the screw, you need to remove the coil pack. The coil pack includes a bolt to attach the socket. So, you have to twist the bolt first to pull the coil pack.

Step 4: Blowing dirt and debris

Next, you have to blow the debris and dirt from the older spark plug. Thus the spark plug attaches to the air compressor and generates dust surrounding the spark plug.

Step 5: Removing and replacing

After blowing the dirt, you need to remove the older spark plug. Then you can insert the new spark plug with a wrench to attach it properly.

Step 6: Attaching Grease

Then you can attach a small amount of grease inside of the coil pack of the boot. After that, align the new spark plug and the coil pack to place accurately.

Step 7: Tightening the coil pack

After placing the coil pack, you need to tighten the bolt on it. Then, you need to replace the rest of the spark plugs according to the above steps.

Step 8: Placing air cleaner and hose

When you have finished all the spark plugs in the engine, you have to place the air cleaner first. Finally, you should connect the hose by tightening the screws to complete spark plug replacement.


What is the spark plug gap 2000 mercury grand marquis?

For 2000 Mercury Grand Marquis, you should maintain a gap to set a spark plug. Generally, A 0.052 to 0.056 inches gap is standard for a 4.6-liter engine. But few of the Marquis engines need to maintain 0.044 inches for a quick spark.

How long do NGK G power plugs last?

The NGK G spark plugs can provide 500,000 miles lasting on average. But, many of the G power plugs can deliver 500,000 to 800,000 miles last for an automobile engine too.

Do NGK iridium spark plugs increase horsepower?

Though the increasing rate of NGK iridium spark plugs is few, it may happen. This set of spark plug increases in 2% of the engine of a vehicle. Additionally, this spark plug reduces the fuel cost of a Merquise engine.

What does NGK 3043 TR55GP fit?

NGK 3043 TR55GP is perfect for Mercury Grand Marquis brand automobiles. Besides, this spark plug can fit several brand cars such as the 2003 Chevrolet Silverado and 1996 Toyota 4Runner SR5 too.

What does the P stand for on an NGK spark plug?

The P stands on an NGK spark plug to indicate a projected tip of the spark plug. This project tip informs the depth of the combustion chamber of an engine. Besides, D indicates the threat side, and K indicates the wrench size for a location.


A spark plug of an automobile can enhance the performance of the engine. To replace a set of spark plugs you should know which engine or brand of a vehicle is suitable.

Thus, we have introduced a few spark plugs that best fit Mercury Grand Marquis motors.

Hopefully, the blog on Best Spark Plugs for Mercury Grand Marquis will coordinate you to select the right spark plug to accelerate the engine performance. Let’s enjoy your long drive with a quick start by enhancing fuel economy!

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