What Causes Misfire in Three Cylinders Due to Catalytic Converter Damage?
2 Answers
When encountering misfire in three cylinders due to catalytic converter damage, the reasons may include the following: Ignition Fault: It is necessary to check the ignition coil and high-voltage wires. The ignition coil cannot be repaired and must be replaced if faulty. Fuel Injection Fault: This could be caused by wiring issues or poor fuel injection pressure. Human Operational Errors: Such as carelessness or mistakes during maintenance: faults caused by disturbances, loose connectors, etc. Wear and Aging: Delayed maintenance or the use of substandard, unqualified, or non-compliant engine oil. Engine Fault: If the engine is faulty, it needs to be replaced promptly.
Once my car's catalytic converter failed, all because of a misfire in the third cylinder. Common causes like worn spark plugs or faulty ignition coils can lead to unburned fuel rushing straight into the exhaust pipe. The catalytic converter in the exhaust system overheats when exposed to this unburned fuel, damaging its ceramic core. Over time, this can completely ruin the catalytic converter. During diagnosis, you need to use a scan tool to read trouble codes and check if the ignition timing is off or if there's an intake manifold leak. I've noticed many people overlook the oxygen sensor—if it gives incorrect readings, the wrong air-fuel mixture ratio can also cause ignition failure. Replacing faulty parts promptly can save you a lot of money, as repairing a catalytic converter isn't cheap.
