What Are the Causes of Engine Misfire in One Cylinder?
3 Answers
Engine misfire in one cylinder can be attributed to the following causes: 1. Ignition system failure: Issues such as faulty ignition coils or malfunctioning fuel injectors. In such cases, it is necessary to inspect the vehicle's ignition system and promptly replace spark plugs and clean the fuel lines. 2. Wiring system problems: If one cylinder misfires without causing noticeable engine vibration, it is often due to wiring issues. A thorough inspection of the vehicle's wiring is required to check for any short circuits. 3. Engine malfunction: There are numerous potential causes for engine-related issues, including overheating or poor-quality engine oil. These situations are relatively complex and require professional diagnosis at a repair shop or 4S dealership.
When my car experiences a misfire in one cylinder, it is usually due to a spark plug issue, such as wear or excessive carbon buildup, which significantly reduces ignition effectiveness. Additionally, a faulty ignition coil is also a common cause—this component is responsible for precisely timing the ignition of the air-fuel mixture, and once it fails, that cylinder won't fire. Fuel system problems, such as a clogged fuel injector preventing fuel from entering the cylinder or unstable fuel pump pressure, can also lead to similar issues. Don’t overlook insufficient compression factors, like poor valve sealing or worn piston rings, which reduce cylinder pressure and cause ignition failure. Faulty sensors, such as an inaccurate crankshaft position sensor, can disrupt ignition timing. ECU control failures occasionally occur as well. When a cylinder misfires, the car will noticeably shake, consume more fuel, and may even damage the catalytic converter. It’s recommended to promptly use a diagnostic tool to check for error codes, try replacing the spark plugs or coils first, and if that doesn’t work, visit a professional shop for a comprehensive inspection to prevent engine damage.
Last time I had a car repair, I encountered a misfire in one cylinder, mainly due to a burnt ignition coil, which was easily fixed by a simple replacement. But there are many possible causes: spark plugs not tightened properly or aged, covered with carbon deposits affecting ignition; if the fuel injector is clogged, gasoline can't reach the cylinder; insufficient fuel pump pressure leads to unstable fuel supply; compression issues are less common, but valve leakage or piston ring damage can cause pressure loss and prevent ignition. Sensor failures, such as errors in crankshaft or camshaft position detection, can cause the ECU to give incorrect commands. Loose or corroded wiring can also interrupt current transmission. Safety-wise, driving such a car is very unstable and prone to losing control at high speeds. It's advisable to carry spare parts and start by checking the coil yourself to save time and money. If that doesn't work, seek expert help instead of pushing through.
