Skip the auto shop - Our mechanics make house calls

Q: Knocking when going over bumps

asked by on

I have had struts replaced front and back and lower ball joints and bushings, but when I go over bumps I still have a knocking noise.

My car has 248000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. Most of the time, the clunking or knocking sound when hitting a bump is caused by the stabilizer bar bushings. The stabilizer bar helps to "stabilize" the steering, but also helps to shift weight on the body. When the bushing wear out, they become loose, causing the stabilizer bar to clunk against the mount. This is what causes the clunking sound. There are other issues that may include wheel bearings that may be the source of your problem. One of our local mechanics can inspect your vehicle to determine the source of your problem and recommend corrective action.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Knocking noise. Is it a problem with the belt?

Hello - No, it is incorrect to assume that you couldn't install the new tensioner even though it is of different length. Was the new tensioner longer or shorter? If shorter, there may not be adequate tension on the belt,...

Q: is my fuel pump the problem?

Hi there. Your teacher is correct, the fuel pump could be causing your issue with low pressure or loss of residual pressure while sitting. Not every vehicle has a fuel line valve for testing; these require other setups to perform...

Q: Window won't roll up

Yes, it sounds exactly like the window regulator. The window is held into the door by the regulator which moves up and down by the window motor. This motor is controlled by the window switch or it is manually cranked...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.