What Causes Engine Shaking When Starting the Car?
2 Answers
The reasons for engine shaking when starting the car are as follows: 1. Misfire or cylinder failure: This is the most common cause of engine shaking, usually due to issues with the ignition coil or spark plugs. If the ignition coil malfunctions or the spark plug fails to fire for some reason, the car will experience shaking. 2. Carbon buildup: Severe carbon deposits inside the engine can affect various parameters, leading to clogged spark plugs or valves, which cause the engine to shake. Additionally, it can result in unstable power output. In such cases, an internal engine cleaning at a 4S shop is recommended. 3. Worn engine mounts: Engine mounts are rubber blocks between the engine and the frame, designed to reduce vibrations during engine operation and secure the engine. Once the engine mounts become worn or loose, the body and engine will shake abnormally. Simply replacing the engine mounts will provide an immediate improvement.
This could be an issue with the ignition system. I've encountered many instances where the engine shakes violently during startup, usually due to uneven combustion caused by worn spark plugs or excessive carbon buildup. If multiple cylinders are misfiring, the engine vibration becomes more pronounced, accompanied by intermittent sounds. Additionally, damaged ignition coils or insufficient fuel pump pressure can also cause unstable starts. I've dealt with similar situations before, typically starting with a simple inspection of the spark plugs to check for oil contamination or electrode erosion, replacing them if necessary. If the shaking is severe and accompanied by dashboard warning lights, it's best to seek professional diagnosis at a repair shop immediately to avoid prolonged damage to internal engine components.
