What are the symptoms of a misfiring cylinder in a 4-cylinder engine?

[VonIan]

4-cylinder engine misfiring symptoms are as follows: 1. Abnormal shaking during engine operation. Misfiring disrupts the internal balance of the engine, leading to severe vibrations. The fewer the cylinders or the more cylinders misfiring, the more pronounced the shaking will be. 2. Reduced vehicle power and abnormal engine noise. Misfiring causes a sharp drop in engine power and, due to extremely unstable operation, is accompanied by unusual running noises. 3. Black smoke from the exhaust pipe. If the misfire is unrelated to the fuel supply system, fuel continues to be injected as usual. Unburned combustible mixture is expelled, appearing as black smoke due to incomplete combustion of carbon particles. 4. Difficulty starting and engine stalling. Misfiring can make the engine hard to start or even cause it to stall; this issue worsens with fewer cylinders or more misfiring cylinders.