What Causes Three-Cylinder Misfire and How to Fix It?
1 Answers
Causes of engine misfire can be divided into two main aspects. The first is damage to external components, primarily involving parts around the combustion chamber such as valves, valve seats, valve guides, and spark plugs. The second is misfire caused by the failure to ignite or delayed ignition of the air-fuel mixture inside the cylinder. Below are more detailed explanations: 1. Solutions: For the first scenario, typically inspect the spark plugs, clean carbon deposits from the intake and exhaust valves, and check the turbocharger for issues such as wear or burning on the impeller. The second scenario is usually due to an abnormal component or condition causing unstable ECU regulation of the engine, failing to meet the theoretical values calibrated by the ECU, resulting in misfire. 2. Automotive Engine: The automotive engine is the power-generating device of a car, serving as its heart and determining its power, fuel efficiency, stability, and environmental performance. Depending on the power source, automotive engines can be categorized into diesel engines, gasoline engines, electric motors for electric vehicles, and hybrid systems. 3. Other Causes: A momentary poor spark between spark plugs can lead to cylinder misfire; a stuck or improperly closed injector nozzle coil in one cylinder due to excessive self-induced voltage in the next working cycle can cause poor cylinder performance and misfire; a momentary failure of the switching transistor in the ECU due to poor heat dissipation in high-power transistors can prevent the ignition coil or independent ignition module from functioning, leading to no ignition; instability in modern integrated circuit boards and electrical components can cause many momentary faults that are hard to explain, but since the ECU receives limited signals, it can only reference the knock sensor and crankshaft position sensor to calculate misfire in a specific cylinder.
