Causes include bad motor mounts, universal joints, bad shocks, damaged leaf spring, and more.
What is the Most Common Cause of a Clunking Noise When Accelerating?
The most common cause of a clunking noise when accelerating is a bad motor mount.
While a bad motor mount is the most common cause, other failed components can also make the sound.
Each component will need to be examined to see which has failed and is causing the issue.
8 Causes When a Vehicle Makes Clunking Noise When Accelerating
- Broken Motor Mount
- Transmission Mount
- Failing CV Axle
- Bad U-Joint
- Transmission Failure
- Damaged or Worn Shock
- Damaged Leaf Spring
- Lose Bolt or Component On the Frame
The motor mounts hold the engine in place and are bolted to the frame.
The mounts can be checked with two people, one to press the gas in the vehicle and the other to watch the engine.
Then the gas pedal is pressed, and the engine will lurch up more than usual when a mount is broken.
If the mounts are good, the engine will not move upward by much.
If the engine lifts up 3-5 inches when the gas pedal is pressed, the engine mount is likely bad.
A mount is also located on the transmission, which gives support to the transmission and the back of the engine.
Like a motor mount, if it breaks, it can cause the engine and transmission to move about and cause a clunking noise.
The CV Axle has joints, and if one fails, it can make a noise.
The front of the vehicle can be jacked up, and the tire moved back and forth to see if the CV Axle is the issue.
The U-Joints are located at the front at the end of the driveshaft.
When a U-joint fails, it will often cause a vibration when driving.
There are many moving gears and parts that make up a transmission which and if they fail, can make noises.
If the transmission is failing, there are usually other symptoms, such as not shifting correctly or a dashboard light coming on.
If a shock has failed, then the vehicle will bounce more when hitting bumps.
The noise is usually also heard when hitting a bump.
While they usually never have any issues, sometimes the bolts that hold them in place can become loose from damage.
If an object has hit a leaf spring bolt or corrosion has made it weak, it can sometimes cause issues.
Components such as the sway bar, the rods, brackets and more can all be examined to see if there is any damage or loose bolts.
Why Does My Car Make a Clunking Noise When I Press the Gas?
Causes include failed motor mount, bad U-Joint, damaged leaf spring, and more.
The vehicle will need to be examined to determine the cause.
Can a Transmission Make a Clunking Noise?
Yes, a failing transmission can make a clunking noise.
If the transmission fails, it will often have other symptoms, such as no shifting or grinding sounds.
What Causes a Clunking Noise at the Front End?
A bad motor mount is the most common reason a vehicle makes a clunking noise at the front end.
Other possible sources include a damaged shock or loose components.
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