How to Determine if the Three-Way Catalytic Converter is Clogged?
2 Answers
You can remove the oxygen sensor to check if the internal part of the three-way catalytic converter is damaged or completely blocked, and shake it to listen for any rattling sounds inside. More relevant information is as follows: 1. The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. It can convert harmful gases such as CO (carbon monoxide), HC (hydrocarbons), and NOx (nitrogen oxides) emitted from vehicle exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction. Because this converter can simultaneously transform the three main harmful substances in exhaust gases into harmless substances, it is called a three-way converter. 2. Check whether the catalytic converter has been damaged during driving or if it has overheated. After lifting the vehicle, observe the surface of the catalytic converter for any dents. If there are obvious dents and scratches, it indicates that the carrier of the catalytic converter may be damaged. Observe whether there are severe discoloration spots or slight bluish and purple traces on the shell of the catalytic converter, and whether there are very obvious dark gray spots in the center of the catalytic converter protective cover. If present, it indicates that the catalytic converter has been in an overheated state and requires further inspection. 3. Tap and shake the catalytic converter with your fist. If you hear the sound of objects moving inside, it means the internal catalyst carrier is broken, and the catalytic converter needs to be replaced. Also, check whether the catalytic converter has any cracks, whether all connections are secure, and whether there are any leaks in various pipes. If any issues are found, they should be addressed promptly. This method is simple and effective for quickly checking the mechanical faults of the catalytic converter.
I've been driving used cars for over a decade and have encountered catalytic converter clogs several times. The most noticeable symptom is the car accelerating as slowly as a snail crawling, especially when going uphill. If you suddenly notice increased fuel consumption, muffled exhaust sounds, or a buzzing noise, get it checked immediately. I often try feeling the airflow at the tailpipe with my palm - if the airflow is weak or intermittent, there's likely a blockage. Remember to address it promptly, otherwise it can damage the engine and affect emissions. It's best to have a professional shop perform a backpressure test to confirm the issue. A clogged catalytic converter not only burns more fuel but also increases black smoke emissions, raising environmental pollution risks.
