Bad Motor Mount Symptoms

Bad Motor Mount Symptoms

Motor mounts are a critical component of a car's engine and suspension system. Their primary function is to keep the engine securely in place and prevent excessive vibrations and movements from causing damage or safety hazards.

When motor mounts start to fail, they can cause various symptoms that can negatively affect your car's performance and safety. Therefore, it's essential to understand bad motor mounts symptoms and how to address them before they lead to more significant issues.

This article will discuss the common bad motor mount symptoms, the causes, and how to diagnose and replace them.

How Many Mounts Does a Vehicle Have?

Have you ever thought about how many mounts your vehicle has? While it may not be something you think about every day, motor and transmission mounts are crucial components that help keep your vehicle running smoothly.

Most engines use 2 to 3 motor mounts, while a single transmission mount supports most of today's transmissions. However, the number of mounts used can vary depending on the make and model of your vehicle.

Manufacturers consider several factors when deciding how many mounts to use. The weight of the engine and transmission, as well as their orientation, are important considerations. In addition, the type of mount used can also affect the number required.

Motor and transmission mounts play a critical role in maintaining the stability of your vehicle's engine and transmission. With them, the engine and transmission would be able to move around, leading to various issues.

For example, excessive engine movement can cause damage to other components, such as the exhaust system or drive shaft. It can also result in unwanted vibrations and decrease overall ride quality.

Similarly, a faulty transmission mount can cause the transmission to move around excessively, leading to drivability issues and potentially damaging other components.

The number of motor and transmission mounts in your vehicle can vary depending on several factors. However, no matter how many mounts your vehicle has, it is vital to ensure that they are in good working condition to maintain the stability and reliability of your engine and transmission.

Bad Motor Mount Symptoms

A lousy motor mount can cause various problems, some of which can be dangerous if not addressed promptly. Here are some of the most common signs of a bad motor mount.

1. Engine Damage

One of the most severe symptoms of a bad motor mount is engine damage. A worn or broken mount can cause the engine to shift, which can result in damage to the engine itself.

This can cause various issues, including oil leaks, reduced engine performance, and even complete engine failure.

2. Irregular Movement Under Acceleration

A bad motor mount can cause the engine and transmission to move excessively during acceleration, deceleration, or shifting gears.

This can cause the vehicle to feel unstable or even dangerous, as the driver may lose control of the car.

3. Unusual Noises

If you hear unusual noises from your engine compartment, it may be due to a bad motor mount. These noises can range from a mild clunk or thud to a loud banging or knocking sound.

They may be most noticeable when the vehicle is idling or when accelerating from a stop.

4. Significant Vibration

A worn or broken motor mount can cause significant vibrations to be transmitted from the engine to the vehicle's chassis.

This can cause the car to shake, especially at idle or when stopped at a traffic light.

In severe cases, the vibration can be so intense that it causes damage to other components of the vehicle, such as the exhaust system or the steering system.

If you experience any of these symptoms, it is essential to have your vehicle inspected by a qualified mechanic.

A bad motor mount cannot be fixed with a simple DIY solution and should be addressed as soon as possible to prevent further damage to your vehicle.

What Causes Motor Mounts To Fail?

One of the main reasons engine mounts fail is their rubber isolators drying out and cracking. This process happens gradually over time and can increase heat, moisture, and chemical exposure.

As the rubber degrades, the mount becomes less effective at limiting engine vibration and movement, leading to increased wear on other vehicle parts.

In addition to everyday wear and tear, other factors can contribute to engine mount failure. For example, aggressive driving or heavy loads can put additional stress on the mounts, causing them to wear out more quickly.

Engine mounts can fail due to poor installation, design flaws, or manufacturing defects.

When an engine mount fails, several signs may indicate the problem. One of the most common symptoms is an irregular movement under acceleration. If you notice that your car is jerking or shaking during acceleration, it could be a sign that one or more engine mounts are worn out.

You may also hear unusual noises, such as clunking or banging, particularly when shifting gears. A bad motor mount can also cause significant vibration, which you can feel in the steering wheel or throughout the entire car.

It's essential to address a bad motor mount as soon as possible to prevent further damage to your vehicle.

If you suspect that your engine mounts are failing, having them inspected by a professional mechanic is a good idea. They can check for signs of wear and damage and replace any mounts that are no longer working correctly.

How Long Do Motor/Engine Mounts Last?

Engine mounts generally last between 5 to 10 years before they require replacement. However, it's worth noting that some motor mounts can last significantly longer, remaining in excellent condition for the vehicle's entire lifespan.

It's vital to keep in mind that several factors influence the lifespan of engine mounts. The condition of the road surface on which the vehicle primarily travels is one of the most significant variables.

For instance, a car that frequently navigates bumpy, pothole-ridden city streets may experience more stress on the engine mounts and, therefore, have a shorter lifespan than a vehicle that mainly cruises on smooth highways.

The type of vehicle and driving style also play a role in the durability of the engine mounts. Heavy-duty vehicles, such as trucks that carry heavy loads, can stress the engine mounts more, leading to faster wear and tear.

Moreover, aggressive driving and sudden starts and stops can increase the vibrations and stress on the engine mounts, reducing their lifespan.

Motor Mount Replacement Cost

Replacing a motor mount typically ranges from $200 to $500. However, in rare cases, this cost can soar even higher.

It is important to note that this price is a general estimate and may vary depending on several factors, including the affected vehicle's make and model, the damage's extent, and the type of mount that requires replacement.

Of the total cost, the cost of the parts required for the replacement typically accounts for approximately $30 to $100, while the labor-related expenses can range from $170 to $400.

The labor cost may also vary depending on the technician's experience and skill level, the repair shop's geographical location, and the amount of time required to complete the replacement.

It's worth noting that the engine mount replacement cost may vary significantly depending on the type of vehicle.

Some luxury or sports car models may require more expensive or specialized parts, which can substantially increase the replacement cost. Additionally, some models may require more labor-intensive repairs, which can impact the overall cost.

Another variable that can impact the engine mount replacement cost is the type of mount that needs replacement. A hydraulic mount, for instance, is generally more expensive to replace than a traditional rubber mount.

While the cost of motor mount replacement may vary depending on several factors, it is crucial to ensure that any issues with the engine mounts are addressed promptly to avoid further damage to the vehicle. Regular maintenance and inspections can identify problems early on, potentially reducing the cost of repairs in the long run.


Motor mounts play an essential role in supporting and stabilizing the engine in your vehicle. Over time, wear and tear can cause the motor mounts to fail, leading to severe consequences such as engine damage or failure.

Regular inspection and maintenance of your vehicle's motor mounts can help prevent these issues and ensure your vehicle's safe and reliable operation.

Suppose you detect any of the above bad motor mount symptoms. In that case, it's crucial to have them checked and changed, if necessary, by a professional mechanic as soon as possible to prevent further damage and keep your vehicle running smoothly.