What Causes the Buick Excelle's Engine to Shake and Stall Automatically?

[McAmelia]

Engine carbon buildup, clogged fuel injectors, and ignition system failures can all cause the Buick Excelle's engine to shake and stall automatically. Engine stalling due to carbon buildup: Carbon deposits typically accumulate in the throttle body, spark plugs, cylinders, fuel lines, and intake manifold. These deposits are a carbonized substance formed when fuel burns at high temperatures. Carbon buildup can lead to decreased engine performance, difficulty starting, poor acceleration, excessive noise, and stalling. Solution: Clean carbon deposits promptly. Clogged fuel injectors: Fuel injectors can become clogged due to carbon deposits in the engine or impurities in the fuel. A clogged fuel injector results in inaccurate fuel injection and prevents the formation of a properly mixed combustible gas, leading to incomplete combustion, reduced engine power, and shaking or stalling. Normally, fuel injectors should be replaced every 60,000–80,000 kilometers. Ignition system failure: Spark plugs and ignition coils in the ignition system are wear-prone components that require regular replacement. If there is a fault in the ignition system, the combustible gas mixture in the cylinders may fail to ignite properly, preventing complete combustion. This can cause abnormal engine shaking, weak acceleration, black smoke emissions, and a tendency to stall automatically at low speeds.