What Causes Multi-Cylinder Misfire in Cars?
2 Answers
Car causes of multi-cylinder misfire: The air-fuel mixture in the cylinder fails to ignite or ignites with a delay. It is recommended to check the spark plugs, clean carbon deposits from the intake and exhaust valves, and then inspect whether there are issues with the turbocharger, such as wear or erosion of the turbocharger impeller. Delayed ignition is usually caused by abnormalities in a certain component or part, leading to unstable ECU regulation of the engine and failure to meet the theoretical values calibrated by the ECU, resulting in misfire. A multi-cylinder engine is an engine with more than two cylinders, composed of several identical single cylinders arranged on a single block sharing a crankshaft to output power. The more cylinders an engine has, the more evenly the crankshaft rotates, and the smaller the vibration. Multi-cylinder engines can have cylinder arrangements such as inline, V-type, and horizontally opposed, depending on factors like installation and cooling methods.
A few days ago, I noticed my car was shaking violently with the engine light on. After a check at the repair shop, it was diagnosed as a multi-cylinder misfire issue. This often stems from fuel system failures, such as a fuel pump not supplying enough fuel or clogged fuel injectors causing uneven gasoline distribution, leading to several cylinders failing to ignite. If the mass airflow sensor malfunctions and provides inaccurate signals, the ECU may incorrectly adjust the air-fuel mixture ratio, resulting in similar symptoms. Additionally, aging spark plugs or ignition coils—if one fails—can destabilize other cylinders. I remember the mechanic advising that regularly replacing the fuel filter and inspecting spark plugs can prevent many issues. Neglecting this could lead to severe engine damage and wasted fuel costs over time. After replacing the faulty parts, my car ran smoothly again. I recommend prompt repairs to avoid worsening the situation.
