Why Is My Car Shaking?

Did you start to feel that your car was shaking? That's not a good sign. Feeling your car shaking while driving can be unsettling. Whether it's a small vibration or a severe shaking, it's important to understand the cause before it leads to a bigger problem.

Car shaking is a common issue for drivers because it can be caused by a wide range of problems that naturally occur due to normal vehicle use, road conditions, and wear or tear.

A shaking car can lead to several issues, like tire problems, brake wear, suspension issues, or even engine trouble. If your tire starts to shake, it's important to get your vehicle inspected and repaired as fast as possible. In this blog, "Why Is My Car Shaking," we will explore the various issues that can cause a car to shake, explaining how these problems occur, and what actions to take in each case.

Common Reasons Why Your Car Is Shaking

There are several common reasons why your car may be shaking, starting with tire and wheel problems as well as brake system issues. If you are confident that your tires and wheels are in good condition, the shaking may be caused by other factors, such as issues with the brake system or engine-related problems. In the section below, we will explain these issues in detail and provide guidance on how to fix them.

Tire and Wheel Issues

Tires and wheels are the first place that needs to be checked when the vehicle starts shaking. Tires are the only thing that has a directional contact with the road, so any imbalance or uneven wear can cause a vibration or shaking. If your tires are unbalanced, one side of the tires can have more weight than the other, which can easily lead to shaking, especially at high speeds.

At the same time, if your wheels aren't properly aligned, the car may pull to one side and as a result, it may also shake or vibrate. Tires wear out over time, and if they don't wear evenly, it can cause vibrations throughout the car.

Unbalanced tires can be fixed by having tires professionally balanced using a balancing machine, which identifies heavy spots and applies small weights to correct the imbalance. This process is recommended for every driver after 6,000 to 8,000 miles or after tire rotation.

Fixing misaligned wheels involves professional wheel alignment service, where a technician adjusts the camber, toe, and caster angles to factory specifications, ensuring optimal tire contact with the road.

And last but not least, uneven tire wear can be fixed by regularly checking and maintaining the recommended tire pressure, as specified in the owner's manual or on the driver's door jamb, which is a fundamental preventive measure. Also, inspection by a mechanic is necessary to identify and replace any failing suspension parts, which will restore proper tire wear.

Brake System Problems

If your car shakes when braking, the issue may be coming from the braking system. The issue can be caused by worn or damaged components, and it can make it harder to brake and stop. The shaking problems can be in warped brake rotors or on worn brake pads.

Warped brake rotors can wear unevenly or become warped due to excessive heat. It can easily lead to shaking when applying the brakes. On the other hand, worn brake pads are too thin, and they may cause vibrations when they come into contact with the rotors.

To fix the brake system problems, the first thing is to inspect brake rotors, since it is the most common cause of vibrations during braking. If the rotors are warped, they need resurfacing or replacement, especially if they are worn below the discard thickness. Also, replace worn brake pads promptly if they are less than 3 mm thick, as uneven or worn pads can cause shuddering. It is also recommended to replace brake pads and rotors as a set per axle to ensure consistent performance.

Engine-Related Issues

Engine-related issues can cause a car to shake, often due to misfiring cylinders, worn spark plugs, vacuum leaks, or dirty fuel injectors. Other contributing factors may include faulty engine mounts and problems with the fuel system or air intake. These issues can lead to vibrations while idling or accelerating.

Shaking caused by engine misfires occurs when a cylinder fails to fire correctly, typically due to a lack of fuel, low compression, or an inadequate spark. Worn spark plugs can create vibrations by failing to ignite the air-fuel mixture properly. Clogged or dirty fuel injectors can disrupt the correct amount of fuel entering the cylinders, resulting in a rough-running engine. Vacuum leaks can disturb the air-fuel ratio, causing the engine to run poorly and shake. Additionally, a dirty air filter can deprive the engine of oxygen, negatively affecting the air-fuel mixture.

To address these issues, you can perform basic maintenance, such as replacing spark plugs and the air filter, cleaning the throttle body, or inspecting vacuum lines. If you have a misfiring cylinder, consider replacing the spark plugs and checking their connections. If the problem persists, have the ignition coils and the fuel injectors professionally diagnosed. Worn engine mounts can be inspected for cracks or wear, and if damaged, they should be replaced. If the issue continues or is more complex, take your car to a qualified mechanic for a professional diagnosis. They have the necessary tools to diagnose issues with the fuel system, engine compression, or internal engine problems.

Transmission and Drivetrain Problems

A shaking car with transmission and drivetrain problems can be caused by several factors, including low or dirty transmission fluid, worn or broken mounts, or internal component issues such as a faulty torque converter or clutch. It's important to address these issues promptly to prevent further damage. Low or contaminated transmission fluid can lead to grinding parts and shuddering. Therefore, checking the fluid level and condition is crucial, and it should be replaced if necessary.

Worn-out motor and transmission mounts can allow the engine and the transmission to move excessively, which results in shaking. To solve this issue, visually inspect the mounts for cracks or wear, and replace them if needed. Additionally, a faulty torque converter in an automatic transmission or a worn-out clutch in a manual transmission can also cause vibrations. A professional mechanic can diagnose and repair or replace the faulty component to fix the issue.

Furthermore, a bent driveshaft or worn inner CV joints can lead to shaking that worsens with speed. It’s advisable to have a professional inspect the driveshaft and CV joints to address any damage.

Be mindful of other symptoms, such as strange noises, difficulty shifting, or a check engine light. If the problem persists or is severe, it is best to have a professional mechanic diagnose the issue.

Suspension and Steering Components

Worn-out components like ball joints, tie rods, shocks, struts, and bushings can cause shaking and vibration during driving. Worn ball joints connect the suspension to the steering knuckles. When they wear out, they can no longer hold the wheel assembly securely in place, resulting in instability and vibrations. Worn tie rods link the steering rack to the wheels; wear and tear can create looseness in the steering, leading to uneven tire wear. A damaged control arm or worn bushings can prevent the wheel from maintaining proper alignment, negatively affecting stability and causing vibrations or shaking.

If you experience shaking and vibrations, and you're confident that your tires, engine, and brakes are in good condition, slow down for safety, especially at high speeds. Check for any nails or foreign objects lodged in your tires, as these can also cause shaking. After that, take your car to a tire shop or a mechanic for a thorough inspection of the suspension and steering components. With the use of specialized tools and diagnostic equipment, they will be able to identify and fix the problem.

Exhaust System Problems

Your car may start shaking for a few reasons related to the exhaust system. One common cause is a loose component, such as a loose exhaust mount, or a damaged catalytic converter. Loose exhaust mounts can lead to rattling and vibrations as components hit the vehicle's underside. On the other hand, a damaged catalytic converter can restrict exhaust flow, creating backpressure that results in performance issues, including shaking.

A loose or broken hanger or bracket can cause the exhaust pipe to sag and make contact with the underside of the car, which can lead to rattling sounds and vibrations felt through the floor, steering wheel, or pedals. Additionally, a failing or clogged catalytic converter can impede the flow of exhaust gases, causing backpressure that makes the engine run roughly, which can lead to shaking, especially when idling.

To address these issues, start by inspecting your vehicle for any loose parts. Look for obvious signs, such as hanging or loose exhaust components. Listening for any unusual sounds can also help you identify problems. Engine issues can be complex, so it’s best to have a mechanic diagnose the situation to prevent further damage.

Frequently Asked Questions

Why Is My Car Shaking When I Accelerate?

A car shaking during acceleration can be caused by issues with the tires, engine, or drivetrain components. This also includes unbalanced tires, worn CV joints, a failing engine, misfire, broken motor mounts, or transmission problems.

Why Is My Car Shaking When I Brake?

Common causes of car shaking when braking include warped brake rotors or worn brake pads. Other potential culprits are issues with tires, calipers, or the suspension system.

Why Is My Car Shaking When I Turn It On?

A car shaking when you turn it on can be caused by engine-related issues like a misfire due to bad spark plugs or a clogged air filter, or by problems with the engine mounts, which can be broken or worn.

Why Is My Car Shaking When I Stop?

A car shaking when you stop can be caused by several issues. Problems with the engine, such as bad spark plugs or worn motor mounts, may lead to shaking. Issues with the brakes, such as worn pads or warped rotors, or transmission issues, including low fluid levels or dirty filters, may also cause the shaking.

Why Is My Car Shaking When Parked?

A car that shakes while parked likely has a rough idle due to engine problems, most commonly worn engine mounts, but also possible issues with spark plugs, the fuel system, or a vacuum leak.

Why Is My Car Shaking When Idle?

A car that shakes while idling is often experiencing issues related to spark plugs, fuel delivery, air intake, or engine mounts. Common problems include worn spark plugs, dirty fuel injectors, clogged air filters, vacuum leaks, or damaged engine mounts.

Why Is My Car Shaking At High Speeds?

A car shaking at high speeds is usually due to unbalanced or unevenly worn tires. Other potential causes include issues with the suspension, steering, or brakes, as well as engine misfires or drivetrain problems.

Why Is My Car Shaking On The Highway?

A car shaking on the highway is most commonly caused by issues with the tires and wheels, such as being imbalanced, misaligned, or damaged. Some other common causes include problems with the suspension or the engine.