What Causes Sudden Engine Shaking During Ignition?
2 Answers
Sudden engine shaking during ignition can be attributed to the following reasons: 1. Poor fuel quality: In winter, lower temperatures make it difficult for fuel to atomize when starting a cold engine, leading to insufficient mixing of fuel and air in the cylinders, which causes difficulty in starting and severe body shaking. 2. Spark plugs: The gap between the electrodes of spark plugs gradually widens, resulting in reduced ignition energy and poor fuel atomization. 3. Ignition coils: Aging ignition coils, high-voltage wires of spark plugs, or electrical leakage can decrease ignition energy. 4. Carbon buildup on engine valves and intake pipes: Carbon deposits can absorb a certain amount of fuel, causing the electronic control unit to miscalculate. While the computer may control the injection of 100 parts of fuel-air mixture, only 90 parts actually enter the cylinder. Even if the remaining 90 parts burn completely, the required power output is not achieved, making shaking inevitable.
Experiencing shaking during startup, I think it's often due to issues with the ignition system. If the spark plugs are worn or the gap is incorrect, the ignition becomes unstable, causing the engine to shake continuously. The fuel system can also be a culprit; clogged fuel injectors or insufficient fuel pressure prevent fuel from entering the cylinders, leading to uneven combustion. Additionally, a leak in the intake manifold or a faulty mass airflow sensor can disrupt the air-fuel ratio, resulting in shaking during acceleration. Ignition coil failures are particularly common, and a misfire in one cylinder can cause noticeable vibrations. Mechanical problems, such as loose engine mounts, can make the entire engine shake during startup. If there's insufficient compression, the cylinder pressure is inadequate, making starting difficult and causing shaking. These minor issues can escalate into major problems if not addressed promptly. It's advisable to visit a repair shop for a comprehensive inspection as soon as possible, especially to check for trouble codes to identify the root cause.
