Why does my Grand Marquis’s check engine light come on when I start it?

It’s usually normal for your check engine light to turn on upon ignition. This is a sign that your vehicle is testing its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.

Why does my Mercury engine sound different?

Unusual noises can signal a problem with your Mercury Grand Marquis engine. Knocking or tapping could be a symptom of low oil. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.

What could damage my Mercury Grand Marquis engine?

Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, flooring the gas pedal while the car is in Park, or accelerating too quickly, too soon. Protect your engine’s performance and efficiency by distancing yourself from these habits.

Can I use water in my Mercury Grand Marquis radiator?

Only in emergencies. A 50/50 mix of coolant and water (or a pre-mixed) coolant is recommended. However, if you must keep driving when you're out of coolant, it's better to drive with water in your coolant reservoir than nothing.

What can cause the engine in my Grand Marquis to suddenly stop?

Reasons your Grand Marquis car engine may suddenly stop include engine overheating, electrical troubles, mechanical issues, ignition system problems, faulty sensors, and low fuel.

Who repairs Mercury Grand Marquis engines?

Your local Firestone Complete Auto Care offers Mercury Grand Marquis engine repair. Schedule an appointment today at one of our thousands of locations nationwide!

Reliable Repairs for 2003 Mercury Grand Marquis Engines

Learn about

2003 Mercury Grand Marquis Trim Options

Select your Mercury Grand Marquis trim level to learn more about Mercury-recommended engine repair. Use the following chart to find information.

V8/4.6L

Mercury Grand Marquis Repairs and Services

Nothing stays the same forever. Even your Mercury Grand Marquis’s engine parts and components will change. When something breaks or fails, we’re ready to help. Select a service or repair below to learn more about what we can do for your 2003 Mercury Grand Marquis.

We Know Mercury Grand Marquis Engines

The Mercury Grand Marquis is respected for its reliability. You may have even been thinking about that when you bought it. However, the wear-proof engine has yet to be invented! Sometimes plans go sideways. If they do, you’ll have to find a dependable 2003 Mercury service center — quick! Luckily, you won’t have to look far, since Firestone Complete Auto Care has 1,700+ locations across the country. We've serviced more than 500 million vehicles since 1926, and our technicians know Mercury Grand Marquis engines. Schedule an appointment if you're experiencing problems that could require engine repair. After all, Firestone Complete Auto Care is one of the most popular picks for professional engine repairs thanks to its service and affordability.

Illuminated Check Engine Light on 2003 Mercury Grand Marquis

An illuminated check engine light on your Mercury Grand Marquis is one of the first signs it's time to 'brake' for engine service. A check engine light that’s on or flashing could be a symptom of a serious problem in your or emission system, and it won’t go away by ignoring it. Potential causes may include a faulty oxygen sensor, damaged spark plug, a problem with your catalytic converter, or a leak in the engine vacuum, but that's only a few of the possible causes. Bring your Grand Marquis to Firestone Complete Auto Care to get computerized diagnostics and our expert techs will get the root of the problem. engine pinging noises, essential fluid leaks, or engine misfiring.

Mercury Grand Marquis Engine Repair

If your 2003 Mercury Grand Marquis needs engine repair, our technicians will provide you with a thorough explanation beforehand. We make recommendations, but you make the final decision. If a repair can wait, we'll let you know. We'll also tell you if it's necessary for your safety. We want to provide you with the information you need to make an informed engine repair decision. Choose Firestone Complete Auto Care for Mercury Grand Marquis engine repairs and you can feel good knowing that we only use Mercury-compliant replacement parts such as the timing belt, motor oil seal, fuses, or a different component.

Questions About 2003 Mercury Grand Marquis Engines

Why does my Grand Marquis’s check engine light come on when I start it? It’s usually normal for your check engine light to turn on upon ignition. This is a sign that your vehicle is testing its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.
Why does my Mercury engine sound different? Unusual noises can signal a problem with your Mercury Grand Marquis engine. Knocking or tapping could be a symptom of low oil. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.
What could damage my Mercury Grand Marquis engine? Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, flooring the gas pedal while the car is in Park, or accelerating too quickly, too soon. Protect your engine’s performance and efficiency by distancing yourself from these habits.
Can I use water in my Mercury Grand Marquis radiator? Only in emergencies. A 50/50 mix of coolant and water (or a pre-mixed) coolant is recommended. However, if you must keep driving when you're out of coolant, it's better to drive with water in your coolant reservoir than nothing.
What can cause the engine in my Grand Marquis to suddenly stop? Reasons your Grand Marquis car engine may suddenly stop include engine overheating, electrical troubles, mechanical issues, ignition system problems, faulty sensors, and low fuel.
Who repairs Mercury Grand Marquis engines? Your local Firestone Complete Auto Care offers Mercury Grand Marquis engine repair. Schedule an appointment today at one of our thousands of locations nationwide!