What Causes Severe Vibration During Car Startup?
2 Answers
Severe vibration during car startup is caused by excessive carbon deposits, insufficient cylinder pressure, or damaged spark plugs. Below are detailed explanations of the specific causes: Excessive Carbon Deposits: Low fuel pressure leads to insufficient fuel supply and lack of power. It is recommended to clean the fuel injectors and check the fuel pressure. Insufficient Cylinder Pressure: This commonly manifests as misfire-induced shaking and also results in lack of power. A cylinder pressure test is required. Additionally, visually inspect whether the balancing weights on the rims are missing or if the wheel hubs are noticeably deformed. Damaged Spark Plugs: This may cause poor ignition, resulting in incomplete combustion and noticeably increased fuel consumption. Replacing the spark plugs is recommended.
Last time my car started, it shook violently, and the whole car was shaking, which scared me a lot. Later, I found out it was an issue with the ignition system. If the spark plugs are worn out or have excessive carbon buildup, the gasoline doesn't burn completely during ignition, causing unstable engine startup. Faulty ignition coils with unstable current can also cause shaking. That time, I went to the repair shop and replaced the spark plugs, and the shaking disappeared immediately. Shaking during startup is often accompanied by weaker ignition sounds or sluggish acceleration. Ignoring it may damage the engine internals, leading to higher repair costs. It's recommended to check the spark plugs for wear every 20,000 kilometers. Regular replacement can prevent shaking and make driving more reassuring. If you hear abnormal ignition sounds, visit a mechanic early.
