How to effectively clean the three-way catalytic converter?
5 Answers
The cleaning methods for the three-way catalytic converter: 1. Use oxalic acid solution for cleaning. Remove the three-way catalytic converter, mix the oxalic acid solution with water in a certain proportion, and soak and clean it; 2. Use the drip method. Connect the device output connector to the vacuum tube, start the engine, open the flow control valve, and slowly drip the cleaning agent into the intake tract for cleaning. 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, HC, and NOx emitted by automobile exhaust into harmless carbon dioxide, water, and nitrogen through oxidation-reduction. The use of the three-way catalytic converter will cause carbon deposits in the throttle valve, fuel injector, etc. If not cleaned, the exhaust port will be blocked, resulting in increased exhaust pressure, engine weakness, reduced vehicle power, slow acceleration, and other symptoms.
I've always believed that cleaning the three-way catalytic converter should start with daily maintenance. I personally prefer using automotive catalytic converter cleaner, pouring it into the fuel tank, and then driving the car for about 100-200 kilometers to let the cleaner circulate. This gently dissolves the accumulated carbon and dirt inside, preventing clogging. The key is to use genuine products and avoid off-brands, applying it periodically. Don't attempt to disassemble it yourself, as those tiny holes can be easily damaged. After cleaning, the exhaust becomes cleaner, the car accelerates more smoothly, and you might even save some fuel. Pay attention to regular engine maintenance, don't delay oil changes to avoid contaminating the catalytic converter with impurities. I perform preventive cleaning every three months—simple and efficient.
After decades of driving, I've learned that cleaning the catalytic converter depends on the situation. For mild clogging, using additive cleaners works well—just choose an eco-friendly spray to add to the intake and let it run for a while, but don't overdo it to avoid pipe corrosion. For severe issues like foul exhaust or poor engine performance, it's best to remove and soak it in a chemical solution; oxalic acid-based products are effective, but wear gloves for safety. Always check for engine oil leaks or burning oil, as these issues accelerate clogging. I once wasted money on improper DIY cleaning, so now I mainly use additives for prevention when symptoms are mild.
I believe safety is the top priority when cleaning the three-way catalytic converter. This component is the core of the emission system, and improper handling may damage its internal structure. The most effective method is to have it professionally cleaned at a specialized shop using ultrasonic cleaning equipment, as they have the expertise to minimize risks. Avoid attempting DIY methods with household products, as corrosive agents can destroy it. Additionally, maintaining the entire vehicle system is crucial—for example, regularly replacing the air filter to prevent dust ingress and ensuring proper engine combustion. I always opt to entrust mechanics with inspection and cleaning, which saves hassle and protects the vehicle.
Maintaining a three-way catalytic converter long-term relies on prevention. I regularly use fuel system cleaners during highway driving to burn off impurities at high temperatures—once a month is sufficient to prevent clogging. For cleaning, specialized equipment like catalytic converter cleaning machines connected to the system for circulation flushing is preferred, offering thorough yet gentle results. Related maintenance includes promptly addressing engine carbon buildup issues or changing engine oil to reduce pollutant accumulation. With this preventive approach, my vehicle rarely experiences catalytic converter problems, saving me from repair hassles.
