What Causes the Car to Shake Like a Spasm During Acceleration?
2 Answers
Reasons why the car shakes like a spasm during acceleration: 1. Excessive carbon deposits inside the engine: Carbon deposits may accumulate on the fuel injector, throttle valve, intake manifold, and spark plugs, requiring thorough cleaning. 2. Blockage in the fuel system: The fuel system needs to be cleaned, and the fuel filter replaced. 3. Engine oil needs to be changed: If the oil has reached its replacement interval, it should be changed along with the oil filter. Below is a related introduction: When a car experiences shaking during acceleration in daily use, a troubleshooting method should be employed to inspect the engine system. After identifying the specific cause of the fault, repairs should be carried out. After the repairs, professional personnel will test-drive the vehicle to ensure there are no issues before returning it to the owner.
Having worked on cars for so many years, I've seen numerous common causes for the jerky shaking during acceleration. The ignition system is the primary culprit—aging spark plugs or faulty ignition coils can lead to uneven ignition and unstable engine combustion. On the fuel supply side, clogged fuel injectors or insufficient fuel pump pressure can also trigger shaking, which worsens with contaminated gasoline. A dirty intake system is no minor issue either; a clogged air filter restricts airflow, affecting the air-fuel mixture formation. Loose engine mounts pose a hidden risk—when their rubber deteriorates, engine vibrations transfer directly to the chassis. Tire imbalance or worn drive shafts become more noticeable during acceleration, especially when turning. Sensor misreadings, like a contaminated oxygen sensor, can cause the ECU to miscalculate. From a safety perspective, such shaking compromises driving comfort and increases hazards. Regular replacement of wear-prone parts like spark plugs is advised, and professional diagnosis should be sought at the first sign of symptoms.
