You press the gas pedal.

The car starts moving… but something feels off.

There’s a vibration. A shaking. Maybe even a slight jerking sensation.

If you’re wondering, “Why does my car shake when I accelerate?” you’re not alone. This is one of the most common concerns drivers experience and it can range from a minor issue to something that needs immediate attention.

Let’s break down what’s happening and what you should do next.

1. Worn or Failing Spark Plugs

One of the most common reasons a car shakes during acceleration is worn spark plugs.

Spark plugs ignite the air-fuel mixture inside your engine. When they’re dirty, worn, or misfiring, your engine doesn’t run smoothly. Instead, it may hesitate or vibrate when you press the gas.

Signs it could be spark plugs:

• Rough acceleration
• Engine misfire
• Check engine light
• Decreased fuel efficiency

If your spark plugs haven’t been replaced in a while, this is often a straightforward fix.

2. Tire or Wheel Issues

If the shaking feels stronger at certain speeds, especially highway speeds, the issue could be tire related.

Common causes include:

• Unbalanced tires
• Uneven tire wear
• Bent wheels
• Loose lug nuts

When your wheels are not properly balanced or aligned, vibrations can travel through the steering wheel and the entire vehicle during acceleration.

3. Worn Engine or Transmission Mounts

Your engine and transmission are secured to the frame with mounts designed to absorb vibration.

If a mount becomes worn or broken, you may feel excessive shaking when accelerating, especially from a stop.

This type of vibration often feels heavier and more noticeable when pressing the gas pedal.

4. Fuel System Problems

If your vehicle isn’t getting consistent fuel delivery, acceleration may feel rough.

Possible causes:

• Clogged fuel injectors
• Dirty fuel filter
• Weak fuel pump

When fuel flow is restricted, your engine struggles under load which can create hesitation and shaking.

5. CV Joint or Axle Issues

If the shaking is more noticeable when turning or accelerating from a stop, you could be dealing with a worn CV joint or damaged axle.

Symptoms may include:

• Clicking sounds when turning
• Vibrations during acceleration
• Grease near the inside of the wheels

This is more common in front wheel and all wheel drive vehicles.

6. Driveshaft Problems (Especially at Higher Speeds)

If your vehicle shakes more intensely as you accelerate to higher speeds, the driveshaft could be unbalanced or damaged.

Driveshaft issues typically cause consistent vibration that worsens with speed.

Is It Safe to Drive If My Car Is Shaking?

It depends on the cause.

Minor tire balance issues may not require immediate repair, but engine misfires, mount failures, or drivetrain problems should not be ignored.

Driving with unresolved vibration can:

• Cause additional damage
• Reduce fuel efficiency
• Lead to unsafe driving conditions

If the shaking is severe, worsening, or accompanied by warning lights, schedule an inspection as soon as possible.

What Should You Do Next?

If your car shakes when accelerating:

1. Pay attention to when it happens (low speeds, highway speeds, turning, etc.).

2. Notice any warning lights.

3. Avoid aggressive acceleration until it’s inspected.

The more detail you can provide, the easier it is for a technician to diagnose the issue quickly and accurately.

Preventative Maintenance Matters

Many vibration issues stem from wear and tear that could have been caught during routine maintenance.

Staying current with the followingnlist below can prevent bigger problems down the road.

• Tire rotations and balancing
• Spark plug replacement
• Fuel system service
• Regular inspections

Final Thoughts

When your car shakes during acceleration, it’s your vehicle telling you something isn’t right.

Sometimes it’s a simple fix. Other times it’s an early warning sign of a more serious issue.

Either way, it’s not something to ignore.

At Paul Campanella’s Auto Centers, our technicians perform thorough inspections to pinpoint the exact cause of vibration. No guessing, no unnecessary repairs. We’ll explain what’s happening and help you make the best decision for your vehicle.

If your car is shaking when you accelerate, schedule an appointment today at one of our convenient locations in Wilmington, Pike Creek, Hockessin, Talleyville, Kennett Square, or Swarthmore.

Drive smooth. Drive confident.