What Causes Car Body Vibration After Ignition?
2 Answers
The severe vibration of a car engine can be caused by aging or loosening of engine mounts, carbon buildup issues, or fuel system malfunctions. Ignition System Malfunction: Problems in the ignition system, such as faults in the car's ignition system, can lead to poor ignition system performance and inadequate spark plug firing, resulting in unstable engine operation during idle. Aging of Engine Mounts: Aging or loosening of engine mounts, which are rubber blocks placed between the engine and the car frame, can cause severe engine vibration. These mounts are designed to reduce engine vibration and provide cushioning during operation, as well as to secure the engine in place. Once the engine mounts age or loosen, the engine's vibration becomes significantly worse. Carbon Buildup Issues: Carbon deposits, including those in the cylinders, throttle body, spark plugs, and intake manifold, can affect the engine's performance. Excessive carbon buildup inside the engine can impact ignition energy, air intake efficiency, and the air-fuel mixture ratio, leading to unstable power output and causing vibrations during idle and acceleration. Poor Fuel Quality: In many cases in China, unstable engine operation, such as "idle" vibration, is closely related to fuel quality. Poor fuel quality can damage engine performance, leading to idle vibration issues.
Body shaking after startup is actually quite common. I’ve encountered it a few times myself, mainly due to issues with the engine ignition system. For example, worn or aged spark plugs can cause uneven ignition, making the car jerk. Another common cause is loose engine mounts—the rubber pads can deform over time, leading to noticeable shaking when idling. Excessive carbon buildup is also troublesome; it can clog the throttle body, disrupting air intake and causing instability. I recommend visiting a reliable repair shop as soon as possible—don’t let a minor issue escalate into major repairs, especially since shaking at high speeds can be dangerous. Regular maintenance, such as cleaning ignition coils and fuel injectors, can help prevent these problems.
