How to Clean the Three-Way Catalytic Converter in a Sedan?
3 Answers
To clean the three-way catalytic converter in a sedan, follow these steps: 1. Start the engine and wait until the water temperature reaches normal levels before turning it off; 2. Pour the cleaning solution into a specialized device, then connect the device's output connector to the vacuum tube; 3. Start the engine again, maintaining the speed at around 2000 rpm, open the flow control valve, and slowly drip the cleaning solution into the intake manifold; 4. After cleaning, keep the engine running for 3 to 5 minutes. The benefits of cleaning the three-way catalytic converter include: 1. Improving the performance of the vehicle's engine; 2. Reducing frequent alarms from the exhaust system's oxygen sensor. The three-way catalytic converter is an essential external purification device installed in the vehicle's exhaust system. It converts harmful carbon monoxide, hydrocarbons, and nitrogen oxides from the vehicle's exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction processes.
Last year, my car's exhaust kept emitting black smoke, and my friend said it was due to a clogged catalytic converter. The cleaning method is quite simple: buy a specialized cleaner, pour it into the fuel tank, and then drive on the highway for about an hour. High-speed driving heats up the exhaust pipe, melting the carbon deposits so they can be expelled with the exhaust. I clean it every six months to avoid expensive repairs. Remember to choose a reputable brand of cleaner—don’t skimp and use cheap, low-quality ones, as they can damage the catalyst. In daily driving, avoid congested roads and drive more on highways to prevent clogs. If you don’t clean it and keep driving, you might experience increased fuel consumption, reduced power, or even fail the annual inspection. Key points: Ensure the fuel tank is half full during the process, and drive long enough for it to take effect. If the problem persists after cleaning, the catalytic converter might be damaged, and you’ll need to visit a repair shop.
Anyone who knows a bit about cars understands that cleaning the three-way catalytic converter isn't difficult—just use fuel additives. Add the cleaner to the fuel tank, then drive, especially on highways, to let the engine burn at high temperatures and remove carbon deposits. This method is suitable for routine cleaning. If the converter is severely clogged and additives can't clean it properly, it needs to be removed for ultrasonic cleaning or replacement. I regularly check the exhaust color: gray or blue smoke is normal, while black smoke indicates a blockage. Also, inspect the exhaust pipe connections for leaks, as leaks can lead to misjudgment. For prevention, use high-quality gasoline and avoid fueling at small stations, as well as sudden acceleration and idling. Don't attempt disassembly yourself, as it can easily damage the seals—leave it to professional shops.
