A car shaking when turned on can be caused by multiple issues, primarily related to the engine or components that affect the engine's smooth operation. Common reasons include engine problems such as misfires due to faulty spark plugs, dirty or clogged air filters, or issues with the fuel system causing improper combustion. Additionally, power steering problems, worn or damaged engine mounts, or imbalanced wheels can also cause noticeable shaking.
Common Causes of Shaking When Turning On the Car
- Engine issues: Problems like faulty spark plugs, clogged air filters, dirty fuel injectors, or engine misfires can cause the engine to shake when starting as it struggles to run smoothly due to insufficient fuel, air, or spark.
- Power steering problems: Low or contaminated power steering fluid, a faulty power steering pump, or a worn power steering belt can cause vibrations and shaking when the engine starts.
- Worn engine mounts: Engine mounts absorb engine vibrations. If they are worn or broken, the car can shake noticeably when the engine runs.
- Wheel imbalance or damaged rims: Although typically felt during driving, severely imbalanced wheels or damaged rims might be perceptible even when starting the car.
- Cold start normalcy: Some slight shaking can be normal shortly after startup on cold engines, as the system runs richer fuel mixtures to adjust to lower temperatures.
What to Do
- Inspect spark plugs, air filters, and fuel injectors for cleanliness and proper function.
- Check power steering fluid levels and look for leaks or pump issues.
- Have engine mounts inspected for wear or damage.
- If shaking continues, a professional diagnostic can identify whether it's an engine, power steering, or other mechanical issue causing the vibrations.
This explanation covers the typical causes of a car shaking when turned on and should help in diagnosing and addressing the issue effectively.
