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What are the reasons for car shaking during driving?

1 Answers

VanKevin

07/30/25 1:58am

There are several reasons why a car may shake during driving: 1. Ignition system issues: Problems such as excessively large or small spark plug gaps, excessive carbon buildup on spark plugs, damaged ignition coils, loose or leaking high-voltage wires, etc. If the idle is unstable, the entire ignition system should be checked. 2. Excessive carbon buildup: Excessive carbon deposits on the engine, throttle, and fuel injectors are the most common cause of engine shaking. Since carbon absorbs gasoline, excessive carbon can be drawn into the cylinders for combustion, leading to fluctuating concentrations of the air-fuel mixture in the cylinders, which is especially noticeable during cold starts. 3. Abnormal water temperature: The engine operates within a specific temperature range. If the water temperature is too high, it can cause early ignition timing, changes in the air-fuel mixture, thinning of engine oil viscosity, and reduced lubrication performance. Common causes of shaking due to high water temperature include insufficient coolant, a stuck thermostat, a non-functioning fan, or an inaccurate temperature control switch. These issues should be addressed to resolve the shaking. 4. Low cylinder pressure: Engines have 3, 4, 5, 6, or 8 cylinders. If one cylinder is not functioning properly, it can lead to engine shaking due to misfiring. Use a cylinder pressure gauge to check the cylinder pressure. Xinba can be used to address low-pressure issues. Xinba is particularly effective for low and unbalanced cylinder pressure and can be added to the engine oil or directly into the cylinders to restore balanced pressure. 5. Low idle speed: The engine idle speed is preset in the car's computer. If the RPM drops below a certain range, the car's computer will automatically adjust it. If the idle speed is too low and causes shaking, it indicates that it is beyond the computer's control range. Check the idle control valve, throttle, air flow meter, vacuum sensor, and adjust the ignition timing to increase the idle speed.

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