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Why Does My Car Clunk Over Bumps and Potholes?
A clunk every time you hit a bump or pothole around Grand Blanc usually points to a worn or loose suspension part, not the road itself. Here's what's actually making that noise and what to do about it.
What’s Going On
What That Clunking Noise Actually Means
A clunk over bumps almost always means something in the suspension has developed play where it shouldn't have any. Sway bar end links, control arm bushings, and strut mounts are all connection points that are supposed to hold tight, and when one wears out, the parts on either side of it knock together every time the suspension moves.
Michigan roads are hard on these connections. Potholes, frost heaves, and the freeze-thaw cycle put repeated shock loads on suspension links, and road salt speeds up corrosion on the hardware holding them together. A link that would last quietly for years somewhere milder can loosen up faster here.
The tricky part is that a clunk can come from more than one place, and it often doesn't get worse in a straight line — it can seem to come and go depending on the road. A hands-on inspection is really the only reliable way to tell which connection is loose, because guessing from the sound alone is unreliable even for an experienced ear.
How Urgent Is It?
Is It Safe to Keep Driving?
A clunk by itself, with no other symptoms, usually isn't an emergency — plenty of drivers put it off for a while without incident. That said, a loose suspension connection tends to wear faster once it starts, and the parts around it can wear unevenly in the meantime, so it's worth getting checked in the near term rather than indefinitely.
If the clunk shows up alongside anything else — the car pulling to one side, looseness in the steering wheel, or the noise clearly getting louder week to week — treat that as a sign to get it looked at sooner rather than later.
What to Expect
What We Actually Check
Reproduce the Noise
We take the car over a rough stretch of road or a driveway edge to recreate the clunk and get a sense of where it's coming from and under what conditions.
Inspect Every Connection Point
On the lift, we check sway bar end links, control arm bushings, strut mounts, and tie rod ends by hand for play — a good connection shouldn't move at all.
Show You What We Found
We point out the specific part that's loose or worn and explain how it connects to your ride, handling, and tire wear before any work happens.
Questions
Straight Answers
Why does my car only clunk over bumps and not on smooth roads?
Worn suspension links usually only make noise when the suspension actually moves, which happens when a wheel goes over a bump or dip. On smooth pavement the suspension barely moves, so there's nothing to knock together. That's actually a useful clue — it tells us the problem is movement-related, in the suspension itself, rather than something like a loose exhaust heat shield that can rattle at idle or over vibration alone.
Could the clunk just be something loose in my trunk or cargo area?
It's worth ruling out first, since it costs nothing to check. Clear loose items from the trunk and back seat and see if the noise changes. If the clunk still happens over bumps with an empty trunk, it's almost certainly coming from the suspension rather than cargo, and it's worth having someone put the car on a lift to find the exact connection point.
Will driving on it longer cause more damage?
A loose connection generally gets looser over time rather than fixing itself, and the extra play can let nearby parts wear unevenly, including your tires. It's not usually a sudden-failure situation, but there's no upside to waiting — the fix doesn't get easier by putting it off, and catching it earlier usually means replacing one worn part instead of several.
Does a clunking noise mean I also need an alignment?
Not necessarily, but the two are related. A loose or worn suspension component can change how your wheels sit, which can throw off alignment angles or accelerate uneven tire wear even if the alignment itself was fine before. It's common for a suspension repair to be followed by an alignment check to make sure everything settles back where it should.
Get That Clunk Checked Before It Gets Louder
Bring your car to Lasco Auto Repair & Tire in Grand Blanc and we'll find exactly what's knocking.
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