What is the method for cleaning a three-way catalytic converter?
4 Answers
The method for cleaning a three-way catalytic converter is: 1. Add cleaning agent to the fuel tank; 2. Use a hanging bottle cleaning method, where the cleaning agent is drawn into the combustion chamber through the intake vacuum suction, and then burned, achieving the purpose of restoring the activity of the three-way catalytic converter through oxidation-reduction reactions inside it; 3. Disassemble and clean, removing the three-way catalytic converter and soaking it in oxalic acid and toilet cleaner, then rinsing it with clean water. The working principle of a three-way catalytic converter is: when high-temperature exhaust gas passes through the purification device, the purifying agent in the three-way catalytic converter enhances the activity of CO, HC, and NOx gases, promoting certain oxidation-reduction chemical reactions.
I've worked in auto repair shops for many years, and there are quite a few methods to clean the catalytic converter, mainly three approaches. First is using fuel additives—you pour a dedicated catalytic converter cleaner directly into the fuel tank, then drive at highway speeds for dozens of kilometers, keeping the engine RPM above 3,000. The high temperature helps burn off and clear carbon deposits and impurities. Second is disassembly cleaning, which requires a professional technician to remove the catalytic converter and soak it in a chemical solution for thorough scrubbing—this delivers longer-lasting results but is time-consuming and costly. Third is catalytic converter regeneration service, where specialized equipment is used to treat it directly on the vehicle. I've seen many car owners damage things by attempting DIY fixes, so I recommend starting with additives—use them every six months for good preventive results. If the vehicle's emission light comes on or acceleration feels sluggish, severe clogging might require professional repair shop service. Regular maintenance like monitoring engine health, changing the air filter periodically, and avoiding low-quality fuel can also extend the catalytic converter's lifespan.
I've been driving for almost thirty years, and I rarely clean the three-way catalytic converter myself, preferring hassle-free methods. The common approach is additive cleaning: buy a high-quality cleaner, pour it in when refueling, and then drive at high speeds on a long trip to rev up the engine—this works for minor clogs and saves both money and effort. There's also professional disassembly cleaning, which requires an experienced mechanic to avoid damaging the internal honeycomb structure. I remember once when my catalytic converter was clogged, the exhaust smelled terrible, but adding cleaner and driving home gradually fixed it. The key is regular maintenance to prevent buildup, like using an additive once a year for prevention, opting for eco-friendly products for safety, and avoiding emission issues that affect air quality. Older vehicles especially need regular oxygen sensor checks, paired with cleaning to extend lifespan and ensure smooth, breakdown-free driving.
I enjoy tinkering with car maintenance myself, and cleaning the catalytic converter is quite simple. Just add a bottle of reliable additive to the fuel tank, then drive at high speed or high RPM for half an hour. The heat will help remove dirt and carbon deposits. DIY is quite satisfying, costing only a few dozen yuan to get it done. Using it once a month can help prevent clogging issues. Remember, if the exhaust smells bad or fuel consumption suddenly increases, clean it immediately. Choose additives from reputable brands to avoid damaging the catalytic converter. Also, take care of the engine air filter and other components to reduce impurities entering the system, keeping the emission system healthy, easy, and eco-friendly.
