Skip to content

Causes of Why Your Car Shakes When Driving Over 70 MPH

If you feel that your car shakes when you drive over 70 mph, there are many possible causes. A bent or out of balance wheel could be the culprit, or your tires could be out of balance. A torn or disconnected vacuum hose could also cause your car to shake. Check the vehicle’s hoses to see if they are damaged or in need of repair. In addition, faulty engine mounts can also cause your car to shake.

Engine failure

While cars can handle high speeds, engine parts wear out much faster than in slower moving vehicles. However, the more frequently you drive your car, the higher your maintenance costs will be. Even though a car can handle high speeds, frequent driving is bad for the engine, as parts can only operate well at a much slower speed. An average engine is designed to achieve 70 mph in one pass and 5,500 rpm, which is far from the maximum speed for an engine.

to show engine fault

A shaking sensation is common at higher speeds, and this usually comes with a burning odor when you stop. Vibrations in a car can be caused by worn rotors, shocks, upper strut bearings, ball joints, and tie rod ends. These wearout parts will typically be discovered during a wheel alignment, and can result in unsteadiness. If you experience vibrations while driving over 70 mph, the symptoms may be more subtle than you might imagine.

Warped brake rotors

When your vehicle is shaking when you drive over 70 mph, you could have warped or out of round brake rotors. Out-of-round brake rotors cause your car to shake and lag while driving, preventing you from maintaining control of your vehicle. You may also notice vibrations in the brake pedal. This is a symptom of out-of-round brake rotors, and should be checked as soon as possible.

to show brake rotor

Regardless of the cause of the shaking, warped brake rotors are usually caused by overheating. The brake system will suffer when warped rotors are present, reducing the effectiveness of brakes. Furthermore, warped brake rotors will increase stopping distances, making them a safety concern. If you are experiencing any of these symptoms, you should take your car to a mechanic immediately.

Warped brake rotors are a major cause of quivering steering wheels. If you ignore these symptoms, you risk developing a chronic vibration and weakening of braking system components, such as calipers, pads, and bolts. Although replacing the rotors will cost around $250, replacing the entire braking system will cost you many times that much.

Warped brake rotors will be unevenly worn and will crack or break at some point in the future. Warped rotors will not only decrease braking power, but they will also cause excessive vibrations that will compromise steering control. The shaking will also damage other components of your car, including your steering wheel.

Warped brake rotors cause your car to shimmy when you are driving over 70 mph. The rotors must be replaced when they are warped. The mechanic must carefully remove them from the car and measure them with a micrometer. If rough spots are not fixed, they may be re-machined by a lathe. The problem with this method is that it shaves off a thin layer of metal, causing re-warping.

If the shaking persists even when you are cruising over 70 mph, you should seek professional help. In some cases, warped brake rotors are the culprit. Getting your vehicle checked by a mechanic will ensure your safety and minimize the risk of further damage. If the shaking continues at high speeds, you should also seek mechanical help to repair the inner CV joints and tires.

Faulty engine mounts

If you’re experiencing vibrations in your steering wheel and feel them increase in intensity as you approach a 70 mph speed limit, then you’re experiencing a faulty motor mount. Motor mounts are important because they support the engine and are made of mostly metal and rubber. These components absorb engine vibrations and prevent them from transferring to other parts of the vehicle. When motor mounts are damaged, they begin to loosen and can cause the car to shake when driving over 70 mph.

Broken motor mounts cause a car to shake when accelerating, and this puts additional pressure on the remaining motor mounts. Replacing the motor mounts will fix the vibration. Other reasons your car may shake while driving over 70 mph include clogged vacuum hoses, a dirty spark plug, or a damaged inner CV joint.

Damaged motor mounts can also cause your car to jerk and sway while driving. You may notice heavy vibrations or impact noises in your engine bay as well. In such cases, it is important to replace your car’s motor mount. Moreover, replacing the engine mount will prevent your car from leaking oil. If you experience the above symptoms, it’s time to get it checked by a mechanic.

Worn or faulty engine mounts can cause your car to shake even at low speeds. If you notice these symptoms, get a new engine and new suspension system. While repairing the suspension system, you may also have to replace your vehicle, which can be more cost-effective. If you don’t notice the shaking, it’s likely a worn out engine mount.

In addition, your vehicle’s steering may shake when you’re driving over 70 mph. Your steering wheel might also shake or feel loose. It’s important to have your steering wheel inspected. If you notice a slight vibration while driving over 70 mph, the issue may be with the motor mounts. When you have the problem fixed, you’ll be able to drive without worrying about the vehicle’s stability.

Disconnected or torn vacuum hose

Your car is likely experiencing vibrations while driving over 70 mph. This vibration could be caused by a disconnected or broken vacuum hose. Insufficient air pressure can lead to engine problems, including misfires or vibration. A disconnected or torn vacuum hose is an easy fix, but the wrong one can cause even bigger problems, including malfunctioning sensors and computers. To prevent this from happening, you can simply replace the hose with a new one. Make sure to tighten the connection before installing the new hose.

to show vacuum hose

This is particularly common in turbocharged cars. When the hose breaks, air leaks out, affecting the proper air-to-fuel ratio. A disconnected or torn hose can cause severe vibrations and misfires. Whether or not a hose is the cause of this problem is up to you, but it’s worth checking.

In addition to disconnection and torn hoses, a faulty radiator fan could be the culprit. In this case, the shakes are most likely to be felt around 60 mph, but they will decrease as you approach higher speeds. The underlying cause of shaking is often an out-of-balance or worn-out tire. It could also be the result of faulty brake components.

Besides disconnection and torn vacuum hoses, other common reasons for car shaking include worn or unbalanced tires, poor tire pressure, bent rims, misaligned wheels, and bent or torn inner CV joints. Apart from these, your car might also be suffering from misaligned or bent inner CV joints or a loose spark plug.

Sources

Engine Failure – an overview | ScienceDirect Topics. (n.d.). Engine Failure – an Overview | ScienceDirect Topics; www.sciencedirect.com. Retrieved May 22, 2022, from https://www.sciencedirect.com/topics/engineering/engine-failure

Common Causes Of Car Engine Failure. (2022, March 13). Blogging Hub; www.cleantechloops.com. https://www.cleantechloops.com/common-causes-of-car-engine-failure/#:~:text=Among%20the%20most%20common%20causes,high%20mileage%20or%20gunky%20oil.

5 Signs Of A Worn Engine Mount | Worn Engine Mounts. (2021, June 2). GMT Rubber; www.gmtrubber.com. https://www.gmtrubber.com/5-signs-need-replace-engine-mounts/#:~:text=A%20common%20cause%20of%20engine,that%20can%20lead%20to%20leaks.