What Causes Shaking During Acceleration in Automatic Transmission Cars?
3 Answers
Shaking during acceleration in an automatic transmission car may be caused by the following reasons: a dirty throttle body leading to uneven air intake and operation, clogged fuel lines causing insufficient fuel supply at low throttle resulting in uneven cylinder operation, or transmission malfunction. Below are detailed explanations: 1. Abnormal Shaking: If an automatic car shakes during startup but runs smoothly afterward, possible causes include: a dirty throttle body causing uneven air intake and shaking, clogged fuel lines leading to insufficient fuel supply and uneven cylinder operation, or transmission issues. Broken or burned high-voltage wires or spark plug failure causing a cylinder to misfire can also result in unstable engine operation and shaking. Check if the battery voltage is within the specified range. 2. Common Causes of Car Shaking: The most frequent causes of car shaking are a dirty throttle body or excessive carbon buildup in the fuel injectors. When there is too much carbon deposit inside the engine, the gasoline sprayed by the cold start injector is largely absorbed by the carbon, leading to an overly lean air-fuel mixture during cold starts and making ignition difficult. In such cases, the car may only start easily once the carbon deposits are saturated with gasoline. After starting, the gasoline adsorbed on the carbon deposits is drawn into the combustion chamber by the engine's vacuum, enriching the air-fuel mixture. This fluctuation between lean and rich mixtures causes unstable idle and shaking after a cold start.
Acceleration shudder is quite common in automatic transmission vehicles, and I've experienced it multiple times myself. The main causes can be attributed to several aspects. First, consider engine ignition system failures, such as excessive carbon buildup on spark plugs or aging ignition coils, which can lead to uneven combustion and unstable power output. Then there are automatic transmission issues, where wear on the torque converter or loose clutch plates can cause jerky gear shifts and result in shuddering. Additionally, tire imbalance or improper wheel alignment can also cause noticeable shaking, especially during high-speed acceleration. I recommend first checking tire pressure and wear yourself. If the issue persists, it's best to visit a professional shop for a comprehensive diagnosis. Ignoring this problem may exacerbate the fault, leading to higher repair costs. Regular maintenance, such as replacing spark plugs and cleaning the fuel system, can effectively prevent these issues and prolong your car's lifespan.
Last time when I accelerated, my car suddenly started shaking violently, like bouncing on rocks. The repair shop later found out it was a bad spark plug, and the mechanic said this is extremely common. Other possible causes include: insufficient transmission fluid level causing unstable pressure; loose engine mounts leading to uneven power delivery; and tire imbalance is also a frequent trigger. My advice is don't delay getting it checked - promptly inspect these areas to prevent minor issues from becoming major troubles. Safe driving is key - if you experience shaking while driving, slow down and find a safe area to pull over. Pay regular attention to your car's sounds and vibration changes to detect abnormalities early. This way you can drive with greater peace of mind.
