What Causes All Needles to Shake During Ignition?
1 Answers
Misfire in individual cylinders is primarily caused by poor performance or damage to the ignition coil, leading to shaking in one or multiple cylinders. Below is an analysis of the reasons for car shaking: 1. Severe engine carbon buildup: The most common cause of car shaking is excessive dirt on the throttle or carbon buildup in the fuel injectors. When there is too much carbon inside the engine, the gasoline sprayed by the cold-start injector is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making ignition difficult. In this situation, the car will only start easily once the carbon deposits are saturated with gasoline. After starting, the gasoline adsorbed on the carbon deposits is drawn into the cylinders by the engine's vacuum suction, causing the air-fuel mixture to become too rich. This fluctuation between lean and rich mixtures leads to rough idling after a cold start. 2. Ignition system issues: Check the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance in the ignition system or spark plugs can also cause such problems. 3. Unstable fuel pressure: If you have already cleaned the engine carbon deposits, throttle body, and replaced the spark plugs but still notice shaking during idling, it is recommended to check the fuel supply pressure and the intake pressure sensor. Abnormal fuel pump pressure or incorrect readings and poor performance of the intake pressure sensor can cause the car to shake. 4. Poor fuel quality: Low-quality fuel often has poor volatility, especially in winter when temperatures are low. During cold starts, the engine block temperature is low, making it difficult for the fuel to atomize. This results in insufficient mixing of fuel and air in the cylinders, leading to difficult starts and severe car shaking.
