What cleaning agent is used to clean the three-way catalytic converter?
3 Answers
Cleaning the three-way catalytic converter can be done using oxalic acid solution. This method requires disassembling the three-way catalytic converter and has specific requirements for the dilution ratio of the oxalic acid solution and the soaking time. Alternatively, a no-disassembly cleaning method can be used, which is suitable for mild blockages. Composition of the three-way catalytic converter: The three-way catalytic converter generally consists of four parts: the shell, damping layer, substrate, and catalyst coating. Shell: Made of stainless steel to prevent oxidation scale from falling off, which could block the substrate. Damping layer: Composed of gaskets or wire mesh pads, it serves to seal, insulate, and secure the substrate. To protect the substrate from damage caused by vibration, thermal deformation, and other factors, the gasket is made of expanded mica and aluminum silicate fibers, bonded with adhesive. Substrate: Made of honeycomb-shaped ceramic material, though many are also made of metal (including stainless steel) materials. Catalyst: Composed of precious metals such as platinum, rhodium, and palladium, sprayed onto the substrate to form the purifying agent. Lifespan of the three-way catalytic converter: The lifespan of a three-way catalytic converter is generally between 80,000 to 100,000 kilometers. The specific lifespan depends on the vehicle's usage conditions, as well as the quality of the fuel used and the driving environment.
I've been driving for over a decade and encountered catalytic converter clogging several times. I've tried several types of cleaners, and specialized additives work best, like those premium fuel additives from major brands. Pour them into the fuel tank and drive at high speeds to heat up the engine and clean carbon deposits. Never go for cheap, low-quality products—they might corrode the converter or be ineffective. If the clogging is severe, you'll need to remove it and use professional spray cleaning, but that requires some skill—beginners shouldn't attempt it. Regular use of cleaners for prevention is the most cost-effective way to avoid spending big on a new converter due to excessive emissions. Oh, and after adding the cleaner, it's best to pair it with an oil change to keep the system cleaner—a friend of mine tried it, and the results were noticeable.
Choosing the right cleaner is crucial for cleaning the three-way catalytic converter. The mainstream options on the market are fuel additive types, which are directly mixed into gasoline for easy DIY operation, or specialized spray cleaners for post-disassembly use, requiring professional techniques and tools. I've used well-known brand cleaners to avoid damaging the precious metal coating with ordinary solvents. It's recommended to clean every 5,000 to 10,000 kilometers to maintain emission efficiency, as blockages can lead to increased fuel consumption or failed exhaust tests. Related maintenance, such as checking the air filter, is also important to reduce external contaminants affecting the catalytic converter's lifespan.
