Mercury Grand Marquis Fuel Injector 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

Fuel Injector Replacement Service

How much does a Fuel Injector Replacement cost?

On average, the cost for a Mercury Grand Marquis Fuel Injector Replacement is $860 with $708 for parts and $152 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
2005 Mercury Grand MarquisV8-4.6L	Service typeFuel Injector Replacement	Estimate$1726.71	Shop/Dealer Price$2107.78 - $3190.21
1999 Mercury Grand MarquisV8-4.6L	Service typeFuel Injector Replacement	Estimate$2039.09	Shop/Dealer Price$2511.80 - $3869.05
1986 Mercury Grand MarquisV8-5.0L	Service typeFuel Injector Replacement	Estimate$1890.63	Shop/Dealer Price$2320.72 - $3541.13
1987 Mercury Grand MarquisV8-5.8L	Service typeFuel Injector Replacement	Estimate$2659.53	Shop/Dealer Price$3281.78 - $5078.81
1986 Mercury Grand MarquisV8-5.8L	Service typeFuel Injector Replacement	Estimate$2704.55	Shop/Dealer Price$3338.17 - $5169.06
1980 Mercury Grand MarquisV8-5.0L	Service typeFuel Injector Replacement	Estimate$3108.59	Shop/Dealer Price$3843.17 - $5977.05
2008 Mercury Grand MarquisV8-4.6L	Service typeFuel Injector Replacement	Estimate$1792.61	Shop/Dealer Price$2199.95 - $3361.94
1989 Mercury Grand MarquisV8-5.8L	Service typeFuel Injector Replacement	Estimate$2675.03	Shop/Dealer Price$3298.08 - $5095.72

Show example Mercury Grand Marquis Fuel Injector Replacement prices

What is a fuel injector and how does it work?

A fuel injector is a fuel metering device that sprays atomized droplets of fuel in a specific pattern into the engine’s intake manifold or directly into the combustion chamber. The injector has a solenoid and valve within and the operation, or pulsing, of the solenoid is controlled by the powertrain control module (PCM). The PCM controls the solenoid’s “on” time in order to keep the air-fuel ratio optimized while the engine load and operating conditions constantly change. Fuel injectors are usually connected to a fuel rail located on the top of the engine and the fuel rail, in turn, is supplied with fuel under pressure from the fuel pump located in the fuel tank.

When to consider replacing a fuel injector:

Rough idle, loss of power, or misfiring. Poor engine operation has many causes but faults in the fuel injection system, including the fuel injectors, are high on the list of possibilities.
Odor of raw gas or visible leaks. Fuel injectors should not leak fuel into the intake manifold when the car is off. If you notice any fuel odor around your car, the possibility of a leaking fuel injector should be considered. There should be no external leak from a fuel injector. If an externally-leaking injector is suspected, do not start your car due to the fire hazard.
Check engine light. Some fuel injection failures, for example, a faulty solenoid, may cause a trouble code to be set in the PCM and that will cause the check engine light to illuminate. The codes are read and the fuel injector is tested directly, as needed.
Major engine repairs, engine replacement, or lengthy storage. All fuel injectors will have deposits given enough mileage. These deposits can cause an imbalance in the performance of the injectors from cylinder to cylinder. When an engine is already disassembled, or if you are installing a new engine, that is a perfect time to service the injectors as a set. All injectors have tiny internal filter baskets. A professional injector service facility will clean each injector ultrasonically and replace these filters for a relatively low cost.

How do mechanics replace a fuel injector?

Injectors can be serviced once removed from the car or replaced outright with new injectors. If the injectors are serviced, specialized cleaning and test equipment are required. The choice to repair versus replace will depend on exactly what is wrong with the injector as well as customer preference. Either option requires removing the injector from the car and the following procedure is typical:

Once the engine is cold, the pressure within the fuel rail is relieved by briefly running the engine with the fuel pump fuse out.
The upper plenum on the intake manifold is removed along with any cables, hoses, or wiring that restricts access.
The supply and return lines are removed from the fuel rail. The electrical connectors to each fuel injector are unlocked and removed. The fuel rail is then unbolted and removed from the intake manifold.
The injector(s) requiring replacement are removed from the fuel rail, taking care to not allow any debris to enter the exposed openings. An O-ring seal usually holds the injector very firmly in a finely polished bore in the fuel rail.
Using a new O-ring, the serviced or replaced injector is re-inserted into the fuel rail — using engine oil on the O-ring to prevent damaging it. O-rings in this application fit very tight to prevent fuel leaks.
The fuel rail is re-installed and the supply and return lines are re-connected. The plenum is re-installed along with all cables, hoses, or wiring.
Finally, the engine is run, there is a careful check for leaks, and the vehicle is road tested.

Is it safe to drive with a fuel injector problem?

Yes, so long as there is no external leak of fuel from a broken or malfunctioning injector, it is safe to drive the car. However, if the injector is known to be malfunctioning, it can cause engine misfires, excessive emissions or, in the case of a badly leaking injector, can overload and overheat the catalytic converter. Additionally, fuel efficiency will always be diminished if the fuel injectors are not working properly.

When replacing a fuel injector keep in mind:

Using high quality (Tier One) gasoline may reduce deposits on fuel injectors and prolong their life.
If an injector problem develops that requires removal of one injector, the best practice is to remove and service all of the injectors at the same time. That service might involve replacement of the electrically failed injector along with off-the-car cleaning of the remaining injectors. Serving all injectors at once ensures the injector set will be balanced, in terms of flow rates, and in turn promote smooth operation of the engine.
Do not use fuel system cleaning compounds, or procedures, unless such materials are specified by the manufacturer of your car.
On the car cleaning of fuel injectors is not as effective as off-the-car cleaning because injectors have tiny internal filter baskets that should be replaced as part of the process of servicing a fuel injector.

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

(390)

Rating Summary

368

12

4

2

4

368

12

4

2

4

SEE REVIEWS NEAR ME

Mark

41 years of experience

77 reviews

Mark

41 years of experience

by Richard

Mercury Grand Marquis V8-4.6L - Idler Pulley - Woodstock, Georgia

Fast and professional

Torrieanto

12 years of experience

632 reviews

Request Torrieanto

Torrieanto

12 years of experience

Request Torrieanto

by Kevin

Mercury Grand Marquis V8-4.6L - Starter - Clearwater, Florida

Tre.. is a true technian . Very knowledgeable and professional. I'd recommend him anytime.

Collins

12 years of experience

488 reviews

Request Collins

Collins

12 years of experience

Request Collins

by John

Mercury Grand Marquis V8-4.6L - Oil Change - Atlanta, Georgia

Collins is auto knowledgeable ,personable and courteous. He did oil change,replaced filter ,installed new battery.and made a thorough inspection of my 16 year old Mercury Marquis very well . Collins knows what he is doing. He did get here somewhat late though but not too late.

Allen

36 years of experience

471 reviews

Allen

36 years of experience

by keith

Mercury Grand Marquis V8-4.6L - Car Radiator Replacement - Deland, Florida

Arrived early, radiator replaced under 1 hour great job

Excellent Rating

(390)

Rating Summary

368

12

4

2

4

368

12

4

2

4

SEE REVIEWS NEAR ME

Recent articles & questions

How Does a Timing Belt Work?

The The timing belt is a belt made of rubber that keeps your camshaft and your crankshaft synchronized so that your valve timing is always right. Some vehicles have a timing chain instead of a belt, but it serves the...

How Long Does a Vacuum Booster Last?

Without Without a properly working braking system, it will be nearly impossible to avoid being in a wreck. Most people fail to realize just how important their braking system is until they are without it due to repair issues. In...

B1979 OBD-II Trouble Code: Passenger Seat Rearward Switch Circuit Short to Battery

B1979 means there is an issue with the passenger seat rearward switch circuit error, likely due to damaged electrical components or a bad switch.

Can I use gasket maker as sealant for my oil pan?

Using gasket maker in place of an oil pan gasket works sometimes. However, what I recommend is using a the actual cork/rubber gasket with a thin coat of The Right Stuff brand gasket sealant applied to both the engine block...

Car makes a ticking sound when key is turned to auxiliary even when the motor isn't running

The HVAC blower motor, if on during these episodes, could account for a noise like that. However, if the blower and all accessories are off, the noise is likely due to some sort of a malfunction in an electro-mechanical device...

Does the quote for valve cover gasket replacement include BOTH valve covers or is it for just one side?

Unless you let me know what you were quoted I cannot say what you were quoted. You can have a quote just for one or both gaskets to be replaced. It is cheaper to have both done at the same...

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