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Car ran about 30 mph car shaked so bad why?

It's impossible to tell exactly why your car shakes at 30 mph without more information. Here are some common causes and how to narrow down the problem:

Possible Causes:

* Wheel Imbalance: If your wheels aren't perfectly balanced, they can cause vibrations, especially at certain speeds. This is a common issue, and tire shops can easily balance your wheels.

* Tire Problems: Check your tires for:

* Uneven Wear: Worn tires can cause uneven contact with the road, leading to shaking.

* Bumps or Bulges: These can indicate tire damage that needs immediate attention.

* Low Tire Pressure: Under-inflated tires can make your car feel shaky.

* Wheel Alignment: If your wheels aren't aligned properly, they can pull in different directions, causing vibrations.

* Suspension Problems: Worn shocks, struts, or other suspension components can lead to a shaky ride.

* Brakes: Warped brake rotors can cause shaking, especially when braking.

* Drivetrain Issues: Problems with your driveshaft, axles, or other drivetrain components can also cause vibrations.

* Engine Problems: In rare cases, an engine misfire or other engine problem can cause vibrations to transfer to the car's body.

What to Do:

1. Check Your Tires: Inspect your tires for wear, damage, and proper inflation.

2. Listen for Noises: Does the shaking come with any unusual noises? This can help pinpoint the problem.

3. Check Your Dashboard: Is the "check engine" light on? If so, a diagnostic scan might be needed.

4. Take it to a Mechanic: If you can't identify the cause, it's best to have a mechanic diagnose the problem. They can use specialized tools and knowledge to determine the root cause.

Important Note: A shaking car can be a safety hazard. If you're experiencing a significant shake, it's important to have it checked out as soon as possible.