Why does the check engine light come on when I start my Grand Marquis?

It’s usually normal for your check engine light to turn on upon ignition. It’s just your Grand Marquis firing up its circuits. The light should go off shortly. Bring your vehicle in if it doesn't.

Why does my Mercury engine sound different?

Strange engine sounds can be a sign something’s off in your Mercury Grand Marquis. Tapping or knocking could mean you're low on oil. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing can indicate a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.

What could damage my Mercury Grand Marquis engine?

Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' revving your engine while the vehicle is in Park, or pushing 'the pedal to the metal' before the engine has warmed up. Steer clear of these habits to help protect engine performance and efficiency.

Can I add water to 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?

Your Grand Marquis car engine could stop suddenly due to low fuel, electrical issues, overheating, a faulty ignition system, mechanical troubles, or sensor problems.

Who repairs Mercury Grand Marquis engines?

Your local Firestone Complete Auto Care has you covered with expert Grand Marquis engine repair. Schedule an appointment today and see us at one of our thousands of locations.

1991 Mercury Grand Marquis Engine Repair

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1991 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.

V8/5.0L

1991 Mercury Grand Marquis Repair

Nothing stays the same forever. Even your Mercury Grand Marquis’s engine parts and components will change. We’re here to help when something stops working. Click on a repair below to learn more about 1991 Mercury Grand Marquis repairs.

We Care for Mercury Grand Marquis Engines

Mercury Grand Marquis drivers trust that their Grand Marquis will take them near and far. You probably thought about that when you got it. However, even your trustworthy engine is subject to wear and tear. Things can go sideways sometimes. If the unexpected strikes, you may search the internet frantically for quick and affordable 1991 Mercury Grand Marquis engine repairs. 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 a courtesy inspection at the first sign of engine trouble. 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 1991 Mercury Grand Marquis

As soon as your Grand Marquis check engine light turns on, it’s time to get an expert’s opinion. A check engine light that’s flashing or steadily illuminated could point to problems with your car’s ignition, Causes may include a faulty oxygen sensor, worn spark plug, issues with your catalytic converter, or an engine vacuum leak, but that's only a few of the possible causes. Bring your Grand Marquis in for an on-board diagnostic check and our expert techs will get the root of the problem. rattling sounds, oil leaks, or misfiring.

Engine Repairs for Your 1991 Grand Marquis

If your 1991 Mercury Grand Marquis needs engine repair, our expert techs will let you know what needs to be done and why before they get started. We don't start working until we have your approval. If a service can wait, we’ll make sure you know. We'll also tell you if it's necessary for your safety. We seek to give you all the info you need to make a smart decision about our services. Turn to Firestone Complete Auto Care for your 1991 Grand Marquis engine repairs and you can feel good knowing that we only use Mercury-compliant replacement parts such as the serpentine belt, valve guide seal, sensors, or other parts.

1991 Mercury Grand Marquis Engine Q&A

Why does the check engine light come on when I start my Grand Marquis? It’s usually normal for your check engine light to turn on upon ignition. It’s just your Grand Marquis firing up its circuits. The light should go off shortly. Bring your vehicle in if it doesn't.
Why does my Mercury engine sound different? Strange engine sounds can be a sign something’s off in your Mercury Grand Marquis. Tapping or knocking could mean you're low on oil. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing can indicate a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.
What could damage my Mercury Grand Marquis engine? Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' revving your engine while the vehicle is in Park, or pushing 'the pedal to the metal' before the engine has warmed up. Steer clear of these habits to help protect engine performance and efficiency.
Can I add water to 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? Your Grand Marquis car engine could stop suddenly due to low fuel, electrical issues, overheating, a faulty ignition system, mechanical troubles, or sensor problems.
Who repairs Mercury Grand Marquis engines? Your local Firestone Complete Auto Care has you covered with expert Grand Marquis engine repair. Schedule an appointment today and see us at one of our thousands of locations.