Most people feel their cars shake when they speed up, but not when they’re just driving along. This can cause a lot of bad things to happen and make people angry. But, even though some possible causes are more obvious than others, Car Shakes When Accelerating But Not When Coasting is often hard to figure out why your car is shaking without professional help.
This article will try to explain why a car might shake when it’s going fast but not when it’s just going along. Let’s get right to it.
Why does a Car Shake When Accelerating?
A car is just a piece of machinery that breaks down if it isn’t taken care of. It’s normal for an old car to shake when you speed up, but it’s not a good sign if your new car does the same thing.
When people get a new car, they usually take good care of it. But as time goes on, they pay less and less attention to the maintenance of their car, which leads to internal parts that don’t work well and a car that shakes and vibrates.
But bad maintenance isn’t the only reason why a car’s transmission shakes when it speeds up. Sometimes it’s a sign that something bigger is wrong with your car.
If you ignore the sudden shaking and vibrations in your car, you will soon be in trouble. But before you jump to conclusions and start taking your car apart, you should know why your car shakes when you accelerate at high speeds.
What Causes a Car to Shake when Accelerating but Not When Coasting
In short, bad CV joints, worn wheel bearings, worn engine mounts, loose or bad vacuum leaks, unbalanced tires, or a bent axle are some of the most common reasons why a car shakes when accelerating.
1. Bad CV Joints
One of the main reasons a car shakes when accelerating but not when coasting is a bad cv joint. People often think that CV joints are only used to connect the transmission to the axle, which is not true.
But this is almost not true, because CV joints are very important for turning and stopping movement along the shaft axis.
This can be done by lining up a cross-shaped CV on the inside with a flat CV on the outside. So, if the CV joints break, it could be why a car shakes when it’s going fast but not when it’s going slow.
2. Broken Motor Mounts
The main job of motor mounts is to connect the engine of a car to the car’s frame. A second goal is to reduce or dampen engine vibrations so that people inside the car don’t feel the engine shaking or vibrating all the time when it’s running. The vibrations are absorbed by the engine mounts, which are made of hard rubber. When a motor mount is broken or damaged, not only will the car shake a lot, but other parts of the engine can get out of place and break because the engine is not in the right place.
You can feel a bad motor mount when the engine is idling, but the shaking may be more noticeable when you speed up because the engine has to work harder. If you change a bad motor mount, the shaking should stop. Remember that if one of the motor mounts breaks, the other mounts have to carry more weight and are more likely to break as well.
3. Wheel Bearing failure or loose
A loose or worn wheel bearing is another common cause of shaking when you speed up. This is one of the hardest things to figure out because most people don’t realize they have a problem until it’s too late.
Wheel bearings are made so that the wheel can turn freely, but they are also made so that the wheel stays in line with its axis. But cracks can appear in the bearings, which will let it move along its axis.
4. Unbalanced Tires
Tires that aren’t balanced can also cause your car to shake when you speed up. If you get new tires, there is a chance that they are not set correctly. So, if these tires are put on the wheel, they won’t be able to handle the weight evenly.
This difference in weight can cause small tremors. The more you can see the vehicle shaking, the faster it is going. Even the steering wheel shakes because the tires can’t handle the weight.
So, if your car shakes at a steady speed and the shaking gets worse as your speed goes up, you might have an unbalanced tire.
5. Damaged Driveshaft
People have also noticed that a problem with the car’s driveshaft is another major reason why the car vibrates when going fast. The driveshaft or propeller shaft’s main job is to send power from the engine to the car’s rear axles and wheels.
Most of the time, it has a rear-wheel drive system. Since the driveshaft’s job is to make the car go faster, a bad driveshaft can make the car shake when it speeds up quickly.
6. Loose Lug Nuts
A simple problem that could lead to a big problem. This happens more often than you might think. If a wheel’s lug nuts weren’t tight enough on the hub and some of them came loose over time, the wheel would have a slight wobble. This would make it seem like the car was shaking while you were driving.
If you don’t tighten the lugs, they could become so loose that your wheel could fall off while you are driving. Let’s just say that you don’t want that to happen. Don’t forget to check that the lug nuts are the right size as well.
Make sure each lug nut is tightened to factory specs with a torque wrench to make sure none of them are loose. If you don’t have a torque wrench, you can tighten with a regular lug nut wrench or tire iron.
7. Bent Axle Or Driveshaft
In a rear-wheel-drive car, where the engine and transmission send power to the back wheels through the driveshaft, a bent driveshaft will be easy to spot. A bend can cause it to shake as it turns. The same is true for bent axles, but you’ll notice them no matter which wheels are being driven.
8. Damaged Fuel Intake
A big reason why your car vibrates when it’s in drive but not when it’s in neutral could be the way it takes in fuel. It sends the fuel to the engine, where it mixes with oxygen and causes combustion.
If the fuel intake is broken, it won’t be able to keep giving the engine the fuel it needs. This will lead to times when the fuel doesn’t get to the cylinders and they don’t burn. Because of this, it vibrates, shudders, and shakes when you move the gear to drive and start the transmission and drive train.
9. Wheel Bearing Failure or Loose Bearings
Another big reason why a car shakes when accelerating but not when coasting is that the wheel bearings are loose or broken. Sadly, it can be hard to spot because many people don’t notice it until it’s too late to do anything about it.
A wheel bearing’s job is to make it easier for the wheel to turn and to keep it in line with its axis. But cracks in bearings can cause them to move off their axis, which could cause the car to shake.
10. Stuck Brake Caliper
If a wheel’s brake caliper is broken and causes the wheel to stick, it can make the car shake. In this case, the steering wheel will start to shake when you get to between 40 and 50 miles per hour. As you keep going faster and faster, the vibrations will get worse. When you stop, you will probably smell something like burning coming from the car.
If you think your brake caliper is stuck, you should be able to tell which wheel it is on by how it smells. You will need to check every part of the brake system, paying special attention to the caliper bolts, slides, and piston. Sometimes all that needs to be done is to clean and lubricate the parts, but broken brake parts will need to be replaced.
11. Disconnected Vacuum Hose
If the vacuum hose isn’t connected, the car will shake and make a lot of noise while you’re driving. But a broken vacuum hose doesn’t just make the car shake.
If your disconnected vacuum hose leaks air because of weathering, it can cause a lack of air pressure, which can cause a sensor to fail, which can cause power loss, even a fire, and other problems.
12. Old Spark Plugs
When a spark plug’s useful life is over, it starts to break down. If your car shakes when you speed up quickly, it could also be because the spark plug is broken.
Axles, to be too simple, are the parts of a car that hold the wheels. If you don’t drive a 6×6 or a big commercial truck, it’s likely that your car only has two.
The engine and transmission of your car send power through a driveshaft to a differential and then to the wheels. It rotates to send power and torque, so a bend can cause a lot of shaking when you speed up.
15. Brake Rotor in Bad Shape
The part of the car that slows down the car when the brake pads rub is the brake rotor. When a car is going fast and the driver hits the brakes, it can sometimes feel like the car is vibrating.
In this case, it would mean that the driver is using a brake rotor or brake disc that is not smooth.
16. Spark plugs that are dirty or worn
If the spark plugs are dirty or clogged, the engine might not work right. Most of the time, the problem is noticed when the car is stopped, but it can also make the car feel like it is vibrating when it is moving.
If you can’t remember when you last changed your spark plugs, it might be time to do so now. If you take one out and see a lot of dark buildup on the tip, it’s likely that all of your spark plugs are bad.
17.The engine is too strong for the surface of the road.
If there is a lot of friction between the tires and the road, the engine will be able to move the car. If the engine isn’t strong enough to overcome this resistance, the tires will start to slip on the road.
18. vacuum leak
A vacuum leak is another common reason why a car shakes when you speed up but not when you let it coast. Several things, like a cracked intake hose or a bad intake manifold gasket, can cause a vacuum leak.
19. Poor Propeller Shafts
Propeller shafts take power from the engine and send it to the tire. If there is a problem with the right shaft, your car may shake when you speed up or slow down.
Tire Not in Tune
It’s annoying when a tire is out of balance, but if that’s what’s making your car shake, you can count yourself lucky. It costs a lot less to balance a tire or even replace it than to replace a motor mount or CV joint.
20. Deformed Brake Revolver
When the brake revolver is broken, the car usually shakes when the transmission is sped up. If your car shakes when you accelerate slowly or quickly, it could be because the brake revolver is broken, which causes the brake calipers and pads to fail.
When the brake pedal is pressed, this problem causes the air pressure in the brake system to be spread in an uneven way.
21. Worn-Out Clutch
A worn-out clutch can also make your car shake when you speed up, but not when you’re just driving along.
This is a common problem, even though many people don’t realize that a worn-out clutch or pressure plate is causing their car to shake.
A worn-out pressure plate won’t be able to send the right amount of torque to the flywheel. This means that you’ll have to rev the engine more often than usual when accelerating or turning. If your clutch is worn out, it can cause your car to shake a lot.
22. Wear and tear out of clutches
Your clutch is another thing that makes your car shake when you speed up, but not when you’re just coasting. This happens a lot, and most people don’t know that a worn or worn-out pressure plate is the cause.
A worn-out pressure plate won’t send the right amount of torque to the flywheel when you accelerate or turn, which will make the engine rev up faster than usual. If your clutch is broken or worn out, your car will shake a lot.
23. Ignition Coil
A spark is made in the combustion chamber by an ignition coil. If the coil is broken, it might not make sparks. This could make the engine shake.
24. Fuel Injectors are Clogged
When dirt or other things, like gunk, get stuck in the fuel injectors, it can make your car vibrate in the drive but not in neutral. This is because the cylinders of the engine aren’t always getting fuel.
Just like we saw above, this would make the engine shake and the car shake when going fast. When you put the car in drive, the transmission connects to the engine and gets these vibrations, which make the whole car shake.
25. Bad Struts or Shocks
If your car’s struts or shocks have any kind of break or crack, which is common, your car might shake when you speed up but not when you’re just coasting.
26. Loose Heave Screws
If the heave screws on a car are loose, the transmission can shake and the car can vibrate when going fast.
This mistake turns into a problem that can lead to more mistakes.
When the heave screws on the tire become loose from being used too much, your car vibrates when you accelerate quickly.
27. Unstable Tires
Tires that aren’t balanced can also make your car shake when you speed up. Most of the time, this is caused by uneven wear. But it can also be caused by the wrong amount of air in the tires.
If the tread on your tires is not even, it will cause vibrations that will make your car shake when you accelerate or turn.
29. The clutch is worn out.
When the clutch wears out, it can’t hold the engine in place anymore. So, the engine starts to move more freely inside the transmission. As the car moves forward, this movement makes the car shake.
For the other problems, such as a broken axle, brake calliper, etc., you may need help from a professional.
These are the kinds of problems that need a lot of mechanical knowledge and skill. Not only that, but the work takes a lot of time.
So, if you don’t have much time and don’t know much about fixing cars, the best thing to do is take your car to a garage.
Most people feel the car shake when they speed up, but not when they’re just going with the flow. This can cause a lot of trouble and make things worse. Even though some possible causes are more obvious than others, it can be hard to figure out why your car is shaking without the help of a professional. But if you’re having trouble, you should check to see if any of the above things are to blame.
Frequently Asked Questions (FAQs) Car Shakes When Accelerating But Not When Coasting
Why does my car only shake when I accelerate?
When I speed up, my car shakes.
If your car shakes when you speed up, it could also be because the engine mounts are loose or broken. As we’ve already said, if your engine mounts are loose or broken, they can’t absorb the vibrations your engine makes when it starts, so you’ll probably feel them when you step on the gas.
Why Is My Car Shuddering?
The most important reason for shaking is when your wheels or tires aren’t working right. The problems include wheels and tires that aren’t all the same size, uneven tire wear, treads that aren’t connected, worn-out tires, broken wheels, and loose lug nuts. It would also help if you made sure to align the wheels at the right time.
Why does my car shake when I accelerate but stop once I let off the gas?
Most of the time, shaking is caused by an imbalance between the engine and how it burns fuel. There might be something wrong with the fuel… You should check the U-joints on the back drive shaft to see if they are broken. You may be able to see loose joints or rust around the joints.
Why Does My Car Shake When I Reach 60 Mph?
If a tire isn’t even or isn’t balanced, the car will shake as it goes faster. First, the vibrations start when a car goes 55 mph and only get worse when it goes 60 mph or more.
Why is my car shaking when I press on the gas?
There could be something wrong with the motor mount. Motor mounts are what connect the engine to the frame of your car. That sounds bad, and it is. If one or more of the motor mounts are broken, pressing the gas pedal can make the engine shake and move around.
What causes the front end of a car to shake when accelerating?
Each axle has a CV joint at the end of it. There is an outside joint and an inside joint. When the inner CV joint is broken or starting to fail, your car will vibrate when you accelerate quickly. As the problem gets worse, the small vibrations become violent shaking when the load is put on it.
Can dirty transmission fluid cause a shake?
If your car’s transmission fluid level gets too low, it might start shaking when you speed up. Even though this is easy to fix, it needs to be taken care of right away. If your car has a leak and you keep driving with too little transmission fluid, it can hurt the transmission for good.
Can your car shake because of the transmission?
Vibrations that grind, shake, and do other bad things
The signals from an automatic transmission are not as loud, but they are still clear. At first, shifting into and out of gears will cause some shaking and vibration. But as the problem gets worse, shifting gears will become more jarring and cause the car to shake more.
Can the car shake because of bad spark plugs?
If the spark plugs don’t work right, the fuel in the engine doesn’t burn evenly, which makes the RPMs change and the noise get louder. You might also feel more vibrations in your car when it’s not moving or when you’re driving slowly. The engine is the source of these vibrations, which can make the whole car shake.
How can I tell if my CV axle is moving?
If you hear a clicking or clunking sound when you turn, that’s a sign that your vibration could be caused by a bad CV joint. Motor mounts hold your car’s engine in place. They are also called engine mounts.
What can cause a car to shake?
The most common sign of a broken driveshaft is shaking and shakiness. If the bushings or U-joints wear out, the driveshaft can vibrate too much. This could also happen if the driveshaft isn’t properly bolted down or if the unit isn’t balanced.
Why does my car only shake when I speed up?
If your engine mounts are loose or broken, they won’t be able to absorb the shakes from your engine starting up properly. This means that you might feel them when you step on the gas. There are also times when a car’s steering and suspension system aren’t lined up right, which makes the car shake when you speed up but not when you’re just driving along.