What are the reasons for car shaking?
3 Answers
Here are the reasons for car shaking while driving: 1. Spark plugs with carbon deposits: After a period of use, spark plugs will accumulate carbon deposits. If not cleaned in time, it will lead to reduced engine torque output, causing shaking when the air conditioning is turned on. 2. Abnormal cylinder pressure: Generally, older cars have a normal cylinder pressure value of 10.5, while newer cars have values around 11 or 12. If the cylinder pressure is abnormal, the car's computer will determine that the cylinder is misfiring and automatically cut off fuel supply, causing the car to shake when starting until it cannot start. 3. Improper fuel usage: The fuel grade represents the octane number and anti-knock index of the fuel. Higher-grade fuel can extend the service life of the three-way catalytic converter and reduce emissions. Additionally, engines with different compression ratios have different requirements for fuel quality. Using the wrong gasoline can cause severe engine carbon deposits, leading to car shaking after turning on the air conditioning.
I've been driving for over a decade and have encountered car shaking issues several times. Last time on the highway, the steering wheel vibrated violently, which really startled me. After checking at the repair shop, it turned out to be a front wheel balancing issue, where uneven tire wear caused the vibration. The engine shouldn't be overlooked either - worn spark plugs can cause unstable ignition, making the car noticeably shake at idle. Or when the suspension system ages, like shock absorbers leaking oil, the car will wobble badly over speed bumps. Remember to check if tire pressures are consistent, as low pressure can also cause shaking. Developing regular maintenance habits is crucial - don't delay until minor issues become major repairs.
There are various reasons for car shaking, with the core issue being an imbalance in the power transmission system. The most common cause is a malfunction in the engine ignition system, where enlarged spark plug gaps or aging ignition coils can lead to abnormal combustion. Tire factors should not be overlooked either, as incorrect wheel balance or deformed rims are particularly noticeable at high speeds. Worn suspension components, such as ball joints or failed shock absorbers, can cause the car body to shake when going over bumps. Worn drive shafts or transmission problems may also contribute to the issue. A simple check can start with measuring tire pressure and balance. If the shaking persists, further investigation into the engine or suspension may be necessary.
