What are the symptoms and causes of a misfiring cylinder?
2 Answers
The symptoms of a misfiring cylinder are: There is an issue with the fuel injector of a certain cylinder, leading to fuel supply problems in that cylinder. The causes of a misfiring cylinder are: The spark plug, ignition coil, and high-voltage wire—these three components can all affect the high-voltage electricity required for ignition. Another less common cause is cylinder leakage. When the engine cylinder valves do not seal properly, resulting in insufficient cylinder compression, misfiring can also occur. A damaged spark plug will not function, but the fuel injector continues to operate. The unburned fuel injected into the cylinder will cause the engine's exhaust emissions to exceed standards significantly. At this point, the vehicle's onboard computer will trigger an alert, and various sensors may not function properly. The information displayed on the dashboard is a direct reflection of the vehicle's condition. When certain engine systems malfunction, the dashboard's warning lights will illuminate, prompting the driver to inspect the vehicle as soon as possible.
Last time on the highway, I suddenly felt the steering wheel shaking violently, and the tachometer needle was jumping up and down erratically. When I got home, the engine idle was extremely unstable, and the car body was shaking like it had Parkinson's. The exhaust pipe was puffing out black smoke, and the fuel consumption skyrocketed alarmingly. Upon inspection, it was found that the third cylinder's spark plug was blackened and leaking electricity, and the ignition coil was burnt and cracked. The mechanic said it was mainly an ignition system failure, such as incorrect spark plug gap, aging and cracking of the coil, or cracking and leakage of the high-voltage wiring harness. It could also be a stuck fuel injector failing to spray fuel or insufficient cylinder compression causing air leakage. Never force the car to run with such issues; stop immediately and check the oil dipstick to see if there's a lack of engine oil, to avoid wearing out the piston rings.
