If your engine is shaking, pulsating, or vibrating more than normal, it usually signals a problem with ignition, fuel delivery, or engine mounts. While some vibrations are normal when the car is idling, excessive shaking means something is not functioning correctly and should be inspected quickly.

What does it mean if the engine is shaking or vibrating?

Excessive shaking indicates that the engine is not running smoothly. This may be due to misfires, uneven fuel delivery, worn components, or mounts that no longer absorb engine movement effectively.

Common causes of engine shaking or vibrating

• Faulty spark plugs or ignition coils causing misfires
• Dirty or clogged fuel injectors
• Vacuum leaks in the intake system
• Worn or broken engine mounts
• Unbalanced or damaged rotating parts (e.g. crankshaft pulley)
• Low compression in one or more cylinders
• Problems with the fuel pump or filter

Why do you need to fix this problem quickly?

Driving with a shaking engine reduces comfort, increases wear on engine and transmission components, and may signal a problem that could lead to complete breakdown. Ignoring misfires, for example, can damage the catalytic converter.

How do you know when to get it checked?

You should book an inspection if:

• The car shakes excessively while idling
• You feel vibrations through the steering wheel or seats
• The Check Engine Light is on
• The shaking worsens under acceleration
• You hear knocking, rattling, or misfiring noises

What happens during an assessment?

A mechanic will:

1. Scan the ECU for misfire or ignition codes
2. Inspect spark plugs, coils, and ignition system
3. Check fuel injectors, fuel pump, and filter
4. Inspect engine mounts for wear or damage
5. Check for vacuum leaks and cylinder compression
6. Road test the vehicle to confirm the vibration source

How much does it cost to fix?

Simple fixes such as replacing spark plugs or engine mounts may cost $200–$500. More complex issues such as injector replacement or internal engine repairs can range from $600–$2,000+.

Is it unsafe to drive with a shaking engine?

Yes. A vibrating engine can compromise performance, cause further damage, and create unsafe driving conditions if the issue worsens suddenly. It should be inspected and repaired promptly.