What Causes Engine Shaking When Accelerating?

2 Answers
LeFelicity
07/24/25 1:13pm
Engine shaking when accelerating can be caused by many reasons, which can be summarized as follows: 1. Engine malfunction: The engine may have a misfiring cylinder or a broken high-voltage wire, leading to shaking. 2. Excessive carbon deposits inside the engine: The gasoline sprayed by the cold start injector is largely absorbed by carbon deposits, resulting in a lean mixture during cold starts, making it difficult to start and causing shaking. 3. Damaged spark plugs: Worn electrode gaps in the spark plugs lead to insufficient ignition, causing incomplete combustion of the air-fuel mixture and resulting in engine shaking when accelerating. 4. Poor gasoline quality: Low-quality gasoline affects the atomization effect of the fuel injectors, leading to incomplete combustion of the mixture in the cylinder, which can cause idle shaking.
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LeCassandra
08/11/25 7:16am
I've experienced engine throttle vibration issues while driving, which are usually caused by an uneven ignition system, such as spark plug carbon buildup or aging, preventing normal ignition and causing the engine to tremble. When pressing the accelerator, if the air filter is clogged, insufficient air intake can also lead to uneven combustion of the fuel-air mixture, increasing vibration. Last time my car had this issue, I also found that the fuel injectors might be partially clogged, causing uneven fuel supply. Ignoring it can be more dangerous when accelerating on slopes and also wastes fuel. I recommend going to a repair shop as soon as possible to check the spark plugs, air filter, and fuel pressure. After simply replacing some parts, my car runs much smoother, making it both safer and more reliable. Developing regular maintenance habits, such as cleaning the air filter every six months, can prevent such vibrations.
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