Clunky Noises When Accelerating and Decelerating

Clunky Noises When Accelerating and Decelerating: Causes and Fixes!

Car Noises When Accelerating and Decelerating:

You must have faced Clunking noises when accelerating or decelerating your car and these can be alarming and frustrating for any driver.

These noises can indicate a severe problem with your vehicle and ignoring them could result in costly repairs down the road.

Clunky Noises When Accelerating and Decelerating

The reasons behind clunking noises can vary, ranging from loose or worn engine belts to the damaged driveshaft or CV joint, Fault wheel bearings, and Worn motor mounts.

Low transmission fluid levels can also cause clunking noises when accelerating and decelerating.

To guarantee your car is safe to drive and to stop future damage, it’s critical to find the noise’s root source and treat it right away.

The most frequent reasons for clunking sounds when accelerating and decelerating will be covered in this article, along with solutions.

Common Causes of Clunky Noises When Accelerating and Decelerating:

If you’ve noticed clunky noises when accelerating or decelerating your vehicle, it’s essential to address the issue immediately. These noises can often indicate a more severe problem with your car.

Clunking noise when accelerating and decelerating can be caused by various factors.

Some of the common causes include Loose or worn engine belts., Damaged driveshaft or CV joints, Low transmission fluid, and Brake issues. These issues can cause the moving parts not to get enough lubricant leading to grinding or even breaking.

Identifying and addressing the root cause of these noises is essential so that we don’t have any further damage done to our precious vehicles!

1.   Loose or worn engine Belt.

Engine belts that are loose or worn might slip or become snagged on other parts, causing a vehicle to jerk or jolt, which can result in clunky noises when accelerating and decelerating.

Serpentine belts that are worn out or dry can make loud screaming noises. Any faulty part of a drive belt system might result in belt noise or premature belt wear. A serpentine will rapidly deteriorate if oil, antifreeze, or power steering fluid leaks onto a belt.

How to fix it?

To fix a loose or worn engine belt, you must first identify which belt is causing the problem. It would be best if you visually inspected the belt for wear or damage. If cracks, fraying, or chunks are missing from the belt, it needs to be replaced.

Additionally, if the belt is loose, it may need to be tightened or replaced. Replacing the tensioner or other components in the drive belt system may be necessary.

It is essential to address this issue promptly because a loose or worn engine belt can lead to more significant problems if left unchecked. A damaged serpentine belt can cause other engine components to fail, such as the water pump and alternator, leading to more expensive repairs.

2.   Damaged driveshaft or CV joints

If your vehicle has been experiencing clunky noises when accelerating and decelerating, there may be an underlying problem with the CV joints or driveshaft. In addition to causing noise, these worn parts can cause vibration or shuddering while accelerating or braking.

A damaged CV joint can cause a similar noise while shifting gears and uneven wear on their inner components that lead to excessive slippage between them during operation.

How to fix it?

To fix the issue, replacing the damaged or worn-out driveshaft or CV joint component is recommended. In some cases, lubrication of the u-joint may help alleviate a squeaking noise at low speeds.

However, it is essential to have the vehicle properly inspected by a qualified mechanic to determine the cause of the clunky noises and ensure proper repair is made.

3.   Low transmission fluid

It could be due to low transmission fluid if you are experiencing clunky noises when accelerating and decelerating. This lack of lubrication can cause the parts to grind against each other and eventually break down, resulting in a clunking noise.

Checking the transmission fluid level and condition on your dipstick will give you an idea if the low transmission fluid is part of your problem; however, there may also be other issues at play that need addressing before troubleshooting this issue entirely takes place.

How to fix it?

Fixing this problem is relatively straightforward: check for any leaks in your engine bay (if possible), top up any existing leaks with new fresh fluids, if necessary, then take care not to overfill – otherwise, water could spill out onto hot components inside which would probably only serve as more damage!

4.   Worn motor mounts.

Clunking, banging, and other impact-type noises can be produced by worn, damaged, or broken motor mounts because of the engine’s weight shifting unduly to the point of contact.

The engine’s weight varies during acceleration and deceleration, and if the motor mount is worn, damaged, or fractured, the engine may move excessively and make a clunking noise. Another sign of a poor or failing motor mount is excessive vibration.

How to fix it?

If you suspect that your motor mounts are worn or damaged, it is essential to have them inspected by a qualified mechanic. Depending on the severity of the problem, there are several potential solutions.

The motor mount can often be replaced relatively easily if worn and not damaged. This involves removing the old mount and installing a new one in its place. In some cases, the mechanic may also need to realign the engine to ensure it is appropriately positioned.

If the motor mount is damaged or broken, it may need to be welded or replaced. This is a more involved repair that typically requires the engine to be lifted out of the vehicle to access the mount. Once the old mount is removed, the mechanic welds the broken pieces together or installs a new one.

5.   Fault wheel bearings

There are various causes of clunky sounds when accelerating and decelerating that are brought on by lousy wheel bearings.

If a worn wheel bearing is left unattended, the shaking of the steering wheel will only get worse and may even happen while the car is accelerating.

A vehicle’s alignment can also be badly impacted by defective wheel bearings, which result in uneven tire wear.

Water infiltration, a worn race, or worn bearing rollers can all result in vibrations in the steering wheel. The more worn out these components are, the greater and more persistent the vibrations will be.

How to fix it?

Wheel bearings need to be replaced in order to be repaired. Wheel bearings can be completely ruled out if you hear the sound of a bad wheel bearing when the car is stopped.

No matter the type of surface you are driving on, wheel bearing noise will always sound the same. Wheel bearing replacement is best left to a skilled mechanic because it can be difficult and time-consuming.

Hence, repairing a bad wheel bearing with a trained mechanic is essential to prevent more harm to the car from occurring while you accelerate and decelerate.

Final Thoughts

Clunky noises when accelerating and decelerating can be caused by various issues, including loose or worn engine belts, damaged driveshaft or CV joints, and low transmission fluid levels.

It is essential to address these issues promptly to prevent more significant problems from occurring. Remember that a clunking noise is never something to ignore, and it is always better to be safe than sorry.

If you cannot identify the noise’s source, it is highly recommended that you take your vehicle to a trusted mechanic for proper inspection and repair. Doing so can ensure your safety and prevent costly repairs in the future.


A: Clunky noises can occur during acceleration and braking for a number of reasons, including worn-out or loose engine belts, driveshaft or CV joint failure, and low transmission fluid levels.

A: No, it is risky to drive if you experience clunky sounds during acceleration and deceleration. Ignoring the noise could lead to other issues and perhaps expensive repairs in the future. To find and fix the problem, it is advised that you get your car inspected by a licensed mechanic.

A: Yes, low transmission fluid can result in higher friction between the moving parts of the transmission, forcing them to rub against one another and produce clunky noises when accelerating and decelerating.

A: The method of repair depends on what is causing the clunking sound in the first place. It may be necessary to tighten or replace engine belts if they are worn or loosened the problem. If the broken component is the result of a damaged driveshaft or CV joint, you might need to repair it.

If low transmission fluid is the problem, you should check the fluid level and top it off if necessary. It is advised that you have your car properly inspected and repaired by a licensed mechanic.

A: It is advised to stick to the manufacturer’s suggested maintenance schedule and have your car periodically inspected by a skilled mechanic in order to prevent clunky noises when accelerating and decelerating.

Moreover, avoiding bumpy surfaces, potholes, and abrupt stops might assist shield the car’s parts from harm.

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