why car shakes when accelerating but not when coasting

How often have you noticed your car shaking or shuddering when accelerating but no shaking when coasting? This is a problem for some cars, especially those equipped with automatic transmissions. The cause is simple: The transmission turns the wheels while your gas pedal is pressed down.

If there isn’t much resistance from the road surface, the engine speed increases and causes the car to shake.

This condition happens when the transmission isn’t lubricated adequately with fluid or has a faulty pump. In extreme conditions, excessive heat can cause a malfunction as well. 

The shaking can even become violent enough to damage the transmission at times. You must act quickly to ensure that your vehicle is safe. Shaking can be caused by a variety of factors other than age.

One of the leading causes of automotive shaking and vibration is a lack of regular maintenance. Internal difficulties, on the other hand, might cause this difficulty.

If you want to keep your automobile from worsening, pay attention to how it rattles as you accelerate the transmission. Below we’ll go through the numerous causes of automobile shaking and possible methods to assist you to overcome the problem.

What causes your car to shake when accelerating? 

An automobile is nothing more than a piece of equipment that will break down if not properly maintained. It’s common for an older vehicle to tremble when accelerating, but it’s not good to indicate if your new car has the same problem. 

The majority of people take excellent care of their fresh new automobile. However, as time passes, they pay less attention to vehicle maintenance, resulting in improper internal parts performing and causing the vehicle to shake and vibrate.

Various factors, including inadequate maintenance, cause car vibrations when accelerating transmission. It might be a symptom of a significant problem with your vehicle. 

Ignoring the abrupt shakes and vibrations in your automobile can do you serious injury shortly. Let’s look at some common reasons for your car shaking when accelerating. 

Top Reasons Responsible for car shakes 

The engine is too powerful for the road surface.

If there is a lot of friction between the tires and the road, then the engine will be able to pull the car along. If the engine isn’t strong enough to overcome this resistance, then the tires will start slipping on the road.

The clutch is worn out.

When the clutch starts to wear out, it can no longer hold the engine in place. As a result, the engine begins to move freely within the transmission. This movement causes the car to shake as it moves forward.

There is an issue with the differential.

When the differential slips, the car starts to shake. It may feel like that the car is about to roll over.

The suspension is worn out.

The suspension is what keeps the tires firmly attached to the ground. If the suspension is damaged, the tires will begin to slip on the road.

Imbalanced tires 

If your car shakes when accelerating, it might be due to imbalanced tires. Uneven wear is the most common cause of this. When the tires lose air, they become less rigid. 

This makes them more likely to slip around on the road. Incorrect tire pressure, on the other hand, might cause it. If your tires’ tread is uneven, vibrations will occur, which will present themselves as shaking while accelerating and cornering.

Wear and tear out of clutches 

Your clutch is another source of shaking while accelerating but not when coasting. This is quite frequent, and most individuals are unaware that the reason is a worn or worn-out pressure plate.

When accelerating and cornering, a worn-out pressure plate will not transmit the proper amount of torque to the flywheel, causing you to rev up higher than usual. If your clutch is worn out or completed, your automobile will shake a lot.

The Transmission

When your transmission is neutral, it’s basically just sitting there doing nothing. However, if the vehicle starts moving forward, the transmission will engage gears to get the engine going. If the transmission isn’t working correctly, this could cause the vehicle to shake.

Bad Brakes

Brakes function by converting kinetic energy into heat. When you press on the brake pedal, the brakes apply pressure to the rotors, slowing down the wheels. If the rotors aren’t wearing evenly, this could lead to uneven braking.

Steering Wheel

The steering wheel has two primary purposes: It helps guide the vehicle and provides the driver feedback about how much power is being applied to the front tires. If the steering wheel is out of alignment, this could affect the amount of force needed to steer the vehicle.

Tire Pressure

Tires have treads that help them grip the ground as they roll across it. Tread depth is measured in millimeters (mm). A tire with a deeper tread will provide more traction than one with a shallower tread.

 However, too deep of a tread can make the tire harder to rotate. If the tread is worn too far, this can result in the tire losing its ability to grip the pavement. Too little air inside the tire can also be an issue.

Suspension System

Suspension systems are designed to absorb shocks and vibrations. They do this by transferring weight from the vehicle to the springs. If the springs are weak or damaged, this can result in the vehicle feeling shaky.


Engine vibration is usually caused by the pistons striking the cylinders. The piston needs to strike the cylinder hard to create enough force to propel the vehicle. The resulting impact won’t be strong enough to move the vehicle if the piston strikes the cylinder slowly.


A clutch connects the engine to the transmission. If the clutch is worn out, it may slip when engaging gears. This can result in the engine shaking.


A gearbox converts mechanical energy into electrical energy. This allows the engine to spin at different speeds depending on what gear is engaged. If the gearbox is old or worn, it may need replacing.

Ignition Coil

An ignition coil creates a spark within the combustion chamber. If the coil is defective, it may fail to produce sparks. This can cause the engine to vibrate.

Exhaust System

An exhaust system removes harmful gases from the engine. If any part of the system fails to work, it could release fumes into the cabin.

Shattered Motor Mounts 

Broken engine mounts are the most common source of tremor and vibration in vehicles. The primary purpose of motor mounts is to assist in attaching a vehicle’s engine to the vehicle’s frame.

Another function of the mounts is to reduce engine shaking so that the driver is not aware of the engine’s vibrations while driving. These motor mounts are composed of solid rubber, which allows them to absorb a lot of vibration.

As a result, when your motor mount is destroyed, the passengers may notice shaking within the vehicle. This is a big issue because if the mounts are not performing their job, the engine will not be in its proper place, resulting in misalignment.

Frequently Asked Questions 

  1. How to Fix imbalanced tires for car shake? 
  • You’ll need a jack, a screwdriver, and a lug wrench to fix uneven tires causing your car to wobble.
  • You must first remove the tire weights.
  • Remove the tires once you’ve completed the previous step.
  • Now thoroughly clean the tires.
  • After all the cleaning, it’s time to reinstall the tires in their designated locations and reinstall the weight.
  • To ensure that the wheels are correctly adjusted, check them many times.
  • The last step is to reposition the tires to their original positions.
  1. How to fix greasiness to improve car shakes when accelerating? 

A lack of lubrication can cause various parts to operate erratically and produce friction. As a result, you should inspect and replace your transmission fluid. There are several factors to bear in mind such as-

When changing the oil or fluid in your automobile, always switch it off. Use the appropriate fluid for your engine. To be sure, read it up in your vehicle’s owner’s handbook. Don’t overdo it with the liquid.

Initiate the engine for a minute or two after pouring to allow the fluid to circulate among the components.

The Bottom Line 

Most people feel the automobile shake when accelerating, but not when coasting. This can lead to a lot of frustration and dire situations. While some probable causes are more obvious than others, determining the source of your automobile shaking without expert assistance can be challenging. However, if you’re having trouble, it’s worth investigating whether the above causes are to blame.