Is It Normal for the Catalytic Converter to Make Noise?
2 Answers
The popping sound from the catalytic converter is considered normal. Located at the rear of the vehicle's chassis, the catalytic converter operates at temperatures close to 1000 degrees Celsius. After the engine is turned off, the internal metal components undergo thermal expansion and contraction, resulting in some popping sounds. Below is an extended introduction: 1. Introduction to the Catalytic Converter: The catalytic converter is a purification device in the car's exhaust system. It converts harmful substances in the exhaust into carbon dioxide, water, and nitrogen, reducing the emission of harmful gases. 2. Maintenance Methods: Vehicles equipped with catalytic converters should not use leaded gasoline. When leaded gasoline burns, lead particles are carried through the exhaust system and can coat the surface of the catalyst. This reduces the effective area of the catalyst, significantly diminishing the converter's efficiency and leading to lead poisoning of the catalytic converter.
I've been driving for nearly twenty years and often hear people talk about strange noises from the catalytic converter. It sounds like something is rattling or knocking inside, which is definitely not normal. Most of the time, it's because the ceramic core inside is damaged, possibly due to prolonged high temperatures or rough road conditions. I remember my old car had this issue once—there was a loud humming noise while driving, and after inspection, it turned out to be loose internal parts in the converter. If not addressed promptly, at best, it could lead to excessive emissions and failing an inspection, and at worst, it could affect the exhaust system or even the engine's health. I also recommend checking the mounting bolts first when encountering such noises—sometimes it's just loose screws. Take it to a 4S shop or a professional repair shop for a diagnostic scan, and replacing the catalytic converter should solve the problem. Remember, don't delay—safety first.
