How to Identify a Misfiring Cylinder?

[DiJune]

Signs of a misfiring cylinder: 1. Increased engine vibration; 2. Abnormal engine noises; 3. Weak engine acceleration; 4. Noticeable exhaust pipe shaking; 5. Lower-than-normal idle RPM. The method to detect a misfiring cylinder is quite simple: just unplug each cylinder's fuel injector and observe the vibration amplitude. After turning off the engine, manually touch the insulating ceramic body of each spark plug one by one. For a four-cylinder engine, the first cylinder is more challenging to access. A cooler temperature indicates that cylinder isn't functioning properly. You can also use a screwdriver to short-circuit the spark plug or disconnect the cylinder wire for a power-cut test. If there's no significant change in engine operation after disconnection, it suggests an issue with that cylinder.