What Causes a Car to Shake at Low Speeds?
2 Answers
Reasons for a car shaking at low speeds: 1. Increased carbon deposits in the throttle, intake tract, valves, and other components: When the car is stationary, the throttle and other parts may accumulate some fuel. Upon ignition, this fuel evaporates, causing an overly rich air-fuel mixture during engine idling, which leads to unstable hot idle. 2. Unbalanced hydraulic power unit: If the hydraulic power unit fails to maintain balance during operation, the car may shake at low speeds. Simply put, this is due to insufficient fuel injection from the engine.
When driving, the car keeps jerking and shaking at low speeds, which is really unsettling. This issue is most likely caused by the ignition system. If the spark plugs haven't been replaced after 70,000 to 80,000 kilometers, the electrode gap becomes too large, and the ignition can't keep up. Another possibility is a cracked ignition coil or poor electrical contact, causing a cylinder to misfire and making the engine shake violently. If the throttle body is completely clogged with carbon deposits, the air intake is insufficient, and no matter how much the computer adjusts the fuel injection, it won't help. During my last maintenance, I found that the air filter hadn't been replaced for two years—it was almost clogged like a rag. After replacing it, the car ran smoothly again, and the idle stopped shaking. Insufficient fuel pump pressure is also a hidden danger, especially when accelerating sharply, the shaking becomes more noticeable. I recommend going to a repair shop first to read the fault codes and prioritize fixing the spark plugs and throttle body.
