Mercury Marquis Spark Plug Replacement Costs

Estimate price near me

Service Location

Customer Ratings

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

See availability

Customer Ratings

Spark Plug Replacement Service

How much does a Spark Plug Replacement cost?

On average, the cost for a Mercury Marquis Spark Plug Replacement is $112 with $17 for parts and $95 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
1974 Mercury MarquisV8-7.5L	Service typeSpark Plug Replacement	Estimate$240.75	Shop/Dealer Price$282.19 - $384.01
1967 Mercury MarquisV8-7.0L	Service typeSpark Plug Replacement	Estimate$220.75	Shop/Dealer Price$262.21 - $364.04
1986 Mercury MarquisV6-3.8L	Service typeSpark Plug Replacement	Estimate$147.07	Shop/Dealer Price$170.11 - $216.68
1980 Mercury MarquisV8-5.8L	Service typeSpark Plug Replacement	Estimate$220.75	Shop/Dealer Price$262.19 - $364.00
1981 Mercury MarquisV8-5.0L	Service typeSpark Plug Replacement	Estimate$279.47	Shop/Dealer Price$335.62 - $481.51
1975 Mercury MarquisV8-6.6L	Service typeSpark Plug Replacement	Estimate$220.75	Shop/Dealer Price$262.21 - $364.04
1979 Mercury MarquisV8-5.0L	Service typeSpark Plug Replacement	Estimate$284.47	Shop/Dealer Price$340.47 - $486.24
1974 Mercury MarquisV8-5.8L	Service typeSpark Plug Replacement	Estimate$225.75	Shop/Dealer Price$267.44 - $369.46

Show example Mercury Marquis Spark Plug Replacement prices

What are spark plugs and how do they work?

Spark plugs are one of the key components of your vehicle’s ignition system. They ignite gasoline and air inside of your engine. This gives your engine the power to propel you down the road. The spark plug takes high voltage electricity from the ignition coil and creates a spark at just right moment during the engine’s combustion cycle. This gives the engine the best mix of power, fuel economy and low emissions. However, the electrode at the end of the spark plug eventually wears out and can cause performance issues.

Spark plugs-MATROX-1

When should you replace spark plugs?

Replacement should follow the vehicle maintenance schedule. This will be listed in the vehicle’s owner’s manual. Some cars require regular replacement at 30k, 60k or 100k miles. It is possible in some cases that a spark plug might fail before the service schedule, but it’s not typically common.

Avoiding spark plug replacement can cause:

Difficulty starting your car.
Check engine light for a misfire code.
Flashing check engine light during acceleration for misfire, this can cause engine damage.
Reduced fuel economy and/or power.
Rough idle and/or unexplained engine vibration.
Failed State emission testing.

Even if only one spark plug is found to be faulty, they should always be replaced in sets. Most engines will require 4,6, or 8 spark plugs.

How do mechanics replace spark plugs?

Spark plugs are threaded into the engine’s cylinder head(s). Most cars have one plug per cylinder, so a four-cylinder engine will have four plugs, a six-cylinder engine will have six plugs, and so forth. The mechanic will:

Have the correct spark plugs on hand for your vehicle
Pull any diagnostic trouble codes that may be related to worn spark plugs.
Remove the original spark plugs and look at removed spark plugs for any clues indicating engine mis-operation exists; such as oil burning, excessively rich mixture, pre-ignition damage etc. Inform owner of any found unusual conditions.
Install new plugs using a torque wrench.
Finally, a road test of the vehicle to confirm normal operation.

Is it safe to drive with worn spark plugs?

Yes, but spark plugs that are worn enough to cause engine-misfiring have the potential to cause engine damage and overheating of the catalytic converter. Regardless of the age of the plugs, or mileage, if the engine misfires or runs poorly, the plugs should be inspected for defects. Generally, spark plug failure will not keep the engine from running, but in cases of extreme wear, you may experience a limitation in the speed at which you can drive the car. If the maintenance schedule says the plugs should be replaced, it is best to do so promptly.

When having spark plugs replaced keep in mind:

High-speed driving may accelerate spark plug wear. Consider earlier than required inspection and tune-up if you operate the car in severe conditions.
Plugs should always be promptly replaced per the manufacturer maintenance schedule even if they appear to be working perfectly.
If your vehicle is equipped with spark plug wires (as opposed to a coil-on-plug system), the wires should be replaced at the same time. This may increase the cost of your repair.
It is possible that when doing a spark plug replacement, your vehicle may also need additional parts like ignition coils, this will add to the repair cost.
Some engines require that the intake manifold be removed while replacing spark plugs. This may increase the parts and labor cost for the repair.
Leaking valve cover gaskets, which have let oil get in contact with the spark plugs, coils or wires, may be the cause of ignition system issues. Valve cover gaskets will need to be replaced in addition to the spark plugs, wires or coils. This will add to the repair cost.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee

Meet some of our expert Mercury mechanics

Real customer reviews from Mercury owners like you.

Excellent Rating

(50)

Rating Summary

49

0

0

0

1

49

0

0

0

1

SEE REVIEWS NEAR ME

Brikk

18 years of experience

389 reviews

Brikk

18 years of experience

by Jim

Mercury Grand Marquis V8-5.0L - Spark Plugs - Charlotte, North Carolina

Brikk is the consummate professional, appearing to be highly skilled at what he does. He was very patient with my inquiries and did not appear to be rushed -- he took all the time that I needed to understand the mechanics of my car. And, as I am a neophyte when it comes to technical data, his patience is even more to be commended. I would definitely trust his judgement when it comes to car repairs.

Richard

11 years of experience

265 reviews

Request Richard

Richard

11 years of experience

Request Richard

by Denise

Mercury Mariner L4-2.3L Hybrid - Spark Plugs - Franklin, Tennessee

Richard arrived on time and completed job in a timely manner. He was courteous and friendly. I would definitely use Richard again.

Kyle

13 years of experience

145 reviews

Kyle

13 years of experience

by Terry

Mercury Tracer L4-2.0L - Spark Plugs - Dallas, Texas

Kyle was very professional, willing to go above and beyond to complete the job. He even found a loose wire that was part of the problem. He also found that some wires had been switched up. He could have just completed the job and left, but he took the extra step. Kyle is a good worker and very respectful.

Breck

20 years of experience

681 reviews

Breck

20 years of experience

by April

Mercury Mariner V6-3.0L - Spark Plugs - Houston, Texas

He came early and completed my repairs with a smile.

Excellent Rating

(50)

Rating Summary

49

0

0

0

1

49

0

0

0

1

SEE REVIEWS NEAR ME

Recent articles & questions

What are the Car Pool Rules in Vermont?

Car Car pool lanes have been around for a few centuries, and have been rapidly growing in popularity. There are currently over 3,000 miles of car pool lanes in the United States, covering any different states. Millions of Americans rely...

How to Become a Certified Mobile Vehicle Inspector (State Car Inspector Certified) in Virginia

Automotive technician jobs include mobile vehicle inspectors. Learn how to do car checks in Virginia through the Universal Technical Institute.

How to Replace a Fog Light Switch on Most Cars

A fog light switch goes bad when the lights do not come or are dim or flickering. A blown fuse may also cause the fog light switch to fail.

What do I do if my MAF sensor is acting up?

Before purchasing a new MAF sensor (https://www.yourmechanic.com/services/manifold-absolute-pressure-sensor-map-sensor-replacement), I would find out why it is failing so you do not damage the new one as soon as you install it. If you think the failure is from getting oil contaminated from...

Fan came on & temperature gauge raised to hot

When you say you had general maintenance, did you get a coolant service? If so, then your engine coolant may have had an air pocket from the coolant change, and then the pocket caused the high temperature spike which then...

Spongy clutch: inconsistent

Hi. I think you have a problem with the clutch master cylinder having an intermittent problem. The clutch master cylinder is just like a brake master cylinder and the O rings in the cylinder go bad causing air to get...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com