Fixing a Car Shaking Problem at Over 70 mph: A Comprehensive Guide

Ever hit the open road, push past 70 mph, and suddenly feel your car shaking like a washing machine on spin cycle? It’s an alarming experience, isn’t it? You’re not alone – this is a common issue many drivers face.

This shaking could be a symptom of several potential issues, ranging from simple to complex. It’s crucial to understand what’s happening under the hood. Let’s delve into the world of high-speed car vibrations and explore possible causes and solutions.

Remember, your safety is paramount. Ignoring these signs can lead to serious, even dangerous, consequences. So buckle up, and let’s get to the bottom of why your car might be shaking at high speeds.

Key Takeaways

  • A car shaking when driving over 70 mph is a common issue often caused by unbalanced wheels, warped brake rotors, worn-out tires, faulty suspension, or poor vehicle alignment.
  • Tire-related issues often contribute to high-speed car shaking, with unbalanced tires and excessive tire wear being prominent causes. Regular monitoring and maintenance of tires can help prevent this.
  • Misaligned wheels and unbalanced tires significantly impact your vehicle’s performance at high speeds. Getting them accurately aligned and balanced can help reduce car shaking at high speeds.
  • Potential engine-related problems, such as a faulty spark plug, engine misfire, clogged air filter, or worn-out engine mounts, can lead to noticeable vehicle shaking at high speeds.
  • Regular maintenance of your vehicle’s spark plugs, air filter, and engine mounts, together with early diagnosis of engine misfires, can help address engine-related issues causing high-speed car shaking.
  • Regular preventive maintenance, in line with the vehicle manufacturer’s recommendations, can help optimize vehicle performance and ensure a smoother, shake-free ride at high speeds.

If your car shakes at speeds around 70-80 mph, the issue could relate to wheel balance or alignment, as discussed in detail on JustAnswer, where experts provide personalized advice based on symptoms. For a broader understanding of car shaking issues, check out this Quora thread where various causes and fixes are explored by automotive enthusiasts. Furthermore, a practical YouTube video offers insights into diagnosing and fixing car vibrations, particularly at highway speeds.

Common Causes of Car Shaking at High Speeds

Ever wonder, ‘Why does my car shake when I drive over 70 mph’? Well, you’re not alone. This common problem perplexes many drivers. Let’s dig deeper into the common causes:

Unbalanced Wheels

This is one of the most common causes. If you’ve recently hit a large pothole or curb, your wheels may be out of balance. When driving at high speeds, this can cause your car to shake.

Warped Brake Rotors

Your car’s brake rotors may be warped. Essentially, this means they are not completely flat. When high speed is reached, this imbalanced contact can cause intense shaking.

Worn Out Tires

Worn out or unevenly worn tires are a significant cause of shaking. Checking tire tread depth regularly can prevent this issue and keep your ride smooth and safe.

Faulty Suspension

A faulty or worn-out suspension system could be the culprit. Shock absorbers, struts, and other aspects of the system can wear down over time causing your car to shake at high speeds.

Vehicle Alignment

Lastly, poor vehicle alignment is another common reason. Incorrect alignment generally causes a car to pull to one side, but at high speeds, it can also cause shaking.

But what do you do once you’ve identified the issue? How do you correct these problems to ensure a smooth ride at high speeds? Well, you will find out in the upcoming sections. Moving on, let’s explore the effective solutions and preventive measures to keep your car running smoothly.

Tire Issues to Consider

When your car shakes at high speeds, the problem often lies with the tires. They’re your vehicle’s only contact point with the road, so even minor issues can lead to noticeable shaking, particularly at speeds over 70 mph.

The most common tire-related causes of car shaking include unbalanced tires and worn-out tires. Let’s delve deeper into these issues.

Unbalanced Tires

Tire balance refers to the equal distribution of weight around the wheel-tire unit. If this equilibrium is disturbed, you’ll usually experience vibrations at high speed.

Improper wheel balance could be due to many reasons. Maybe you’ve hit a pothole recently, or perhaps the tire has just suffered regular wear and tear. In any case, it’s best to get your tires balanced on a routine basis. This process requires specialized machinery, so you’re better off hiring a professional for the job.

Tire Wear

Another essential factor that can lead to your car shaking at high speeds is tire wear. If you haven’t replaced your tires in a long time, the tread might’ve worn out. The result is less traction, which directly translates into vibrations at high speeds.

To determine your tires’ condition, perform a penny test. Stick a penny into your tire’s tread with Lincoln’s head pointing down. If you can see the whole head, it’s time to replace the tires.

Remember, the key to averting tire-induced car shaking lies in regular maintenance and vehicle care. Monitor your tires’ condition, get them balanced periodically, and replace them as necessary.

Wheel Alignment and Balancing

Remedying the issue of your car shaking at high speeds doesn’t stop at tires themselves. Wheel Alignment and Balancing constitute another major area of focus. Both these factors have a direct impact on your vehicle’s performance, particularly as you hit those higher speeds on the freeway.

When you’re cruising over 70 mph, improper wheel alignment can become alarmingly apparent. Simply put, wheel alignment refers to the adjustment of your vehicle’s suspension, not the tires or wheels themselves. It’s the angle and direction at which your tires are set.

Misaligned wheels can lead to a host of noticeable problems:

  • Troubling steering
  • Vibration or shaking
  • Lower fuel efficiency
  • Rapid tire wear

Let’s dive a bit deeper. Front-end alignment, also known as two-wheel alignment, aligns the front wheels to the centerline of your car.

There’s also thrust alignment where besides aligning the front wheels, the rear axle angles are measured too.

The comprehensive four-wheel alignment is best for all-wheel-drive vehicles and those with adjustable rear suspensions. Here, all four wheels are aligned to the vehicle’s center.

Each alignment type ensures that your car delivers a smooth, vibration-free ride. Therefore, getting your wheels accurately aligned can save you from the nerve-wracking ordeal of your car shaking at high speeds.

On the other hand, wheel balancing ensures that your tires and wheels spin without causing any vibrations. Balancing involves adjusting the wheel-tire units’ weight distribution so they turn smoothly at high speeds, meaning, no more car shake above 70 mph.

You’d be surprised at how much balancing your wheels can extend the life of your tires and improve overall ride quality. So, if you’re experiencing car shaking issues, it’s time to consider not only tire health, but also wheel alignment and balancing. A quick trip to your local mechanic can set things right, getting you back on the road, vibration-free.

Engine Problems to Look Out For

Moving beyond wheel alignment and tire issues, engine-related problems are another essential aspect to consider when your car shakes at high speeds. As the heart and soul of your vehicle, the engine should run smooth and steady. However, certain issues might create interruptions in its performance, leading notably to vehicle shaking.

One common issue you may encounter is a faulty spark plug. If a spark plug isn’t working properly, your vehicle will run unevenly, which might cause significant vibrations, especially when driving at high speeds. You’ll need to spot this problem early and replace any defective spark plugs to regain a smooth, steady ride.

Engine misfire might be another reason behind your car shaking once it goes above 70 mph. When an engine misfires, it essentially means one of the cylinders is not firing properly. This might result from a wide range of factors including, a bad fuel injector, a worn-out distributor cap, a vacuum leak, or an air-fuel mixture that’s too lean. Engine misfires can lead to a rough idle, lack of power, and, unsurprisingly, a shaking vehicle at high speeds.

Another offender could be a dirty or clogged engine air filter. When an air filter can’t let the proper amount of air into the engine, it can cause jitters in your vehicle’s performance, making it shake more frequently at high speeds.

However, it’s not all about what’s inside the engine. Often, issues with the engine mounts can lead to vibrations as well. Engine mounts hold your engine and transmission in place. Over time, these mounts may wear out or break, causing the engine to move around and create intense vibrations in your car, particularly when you’re hitting those higher speeds.

Undoubtedly, these engine-related issues can contribute significantly to your car shaking phenomenon. Addressing these problems involves a comprehensive understanding of your vehicle’s engine and its systems. Visiting a local mechanic for a professional evaluation might be the most efficient approach to fix these potential issues. This process will help optimize your vehicle’s performance and help ensure a smoother, shake-free ride above 70 mph.

Remember, the sooner you attack these problems, the better. Not only will you get rid of that annoying shaking, but you’ll also extend the life of your vehicle. The overall health and performance of your car largely depend on a smooth-functioning engine.

Solutions to Car Shaking Over 70 mph

Once it’s clear that your vehicle is experiencing vibrations over high speeds, you’ll want to start troubleshooting those potential sources. Here’s how to address engine-related issues that could be causing your car to shake:

Regularly Replace Your Spark Plugs

Faulty spark plugs can misfire during acceleration. Regular replacement is crucial. Refer to your vehicle’s owner’s manual to find out the ideal replacement schedule. Typically, spark plugs should be replaced every 30,000 to 90,000 miles.

Maintain a Clean Air Filter

A dirty air filter hinders the engine from ‘breathing’ optimally. Refreshing the filter means an improvement in fuel efficiency and engine performance. This could also potentially reduce any excess vibrations in your car. Change it at least once a year or every 12,000 miles. However, consider replacing it more frequently if you drive in harsh or dusty conditions.

Check for Engine Misfires

A misfire can make the car vibrates at high speed. Diagnosing these misfires early can prevent further damage. Visit a professional mechanic who can conduct diagnostic tests and repair any engine issues.

Monitor Your Engine Mounts

Engine mounts play a crucial role in reducing the vibration of your car’s engine. If they’re worn or broken, they won’t do their job properly. Worn engine mounts lead directly to excess vibration, especially at high speeds. Have these checked regularly, particularly if you notice high-rpm vibrations.

Dealer repairs are a good idea for trustworthiness and reliability. However, they can be pricey. If cost is a concern, a trusted independent repair shop can be a great alternative.

Maintenance schedules for your car are not just arbitrary timelines or mileage recommendations. They’re backed by data and years of research from car manufacturers. Following them closely can save you both time and money in the long run. Regular maintenance ensures a smooth, shake-free ride at and above 70 mph.

Remember, driving should be comfortable, even at high speeds. These are just a few maintenance tips to help curb car vibrations at high speeds. It’s always best to consult a professional for comprehensive diagnostics and accurate remedies.


So, you’ve got the tools to tackle that shaky ride over 70 mph. Remember, it’s all about keeping up with your car’s maintenance. Regularly replace those spark plugs and make sure your air filter stays clean. Don’t overlook potential engine misfires and always keep tabs on your engine mounts. It’s these small check-ups that can make a big difference. And don’t forget, your car manufacturer’s maintenance schedule is there for a reason. Follow it. If you’re ever in doubt, there’s no shame in seeking professional help. After all, ensuring a smooth, shake-free ride at high speeds isn’t just about comfort – it’s about safety, too. Your car, and your peace of mind, are worth it.

Frequently Asked Questions

Why is my car shaking at speeds over 70 mph?

Car shaking at high speeds might be due to various engine-related issues, such as worn-out spark plugs, a clogged air filter, engine misfires, or faulty engine mounts.

How can I prevent my car from shaking at high speeds?

Regular maintenance is key. Ensure your spark plugs are replaced periodically, the air filter is clean, and that your engine is in good condition. Monitor the condition of your engine mounts and seek professional help for diagnostics and repairs if needed.

What role does an air filter play in preventing car shakes?

A clean air filter ensures optimal fuel-air mix in the engine, which attributes to its smooth running. A clogged air filter can cause engine misfires, leading to car shakes.

Are engine mounts connected to car shakes?

Yes, faulty engine mounts can lead to car shakes. They hold the engine in place and absorb vibrations. If they’re worn or broken, they can’t absorb vibrations properly, causing the car to shake.

When should I seek professional help?

When routine maintenance isn’t solving the issue, it’s best to seek professional help. Car mechanics can perform a more thorough diagnosis to ascertain the root cause of the car’s shaking.