How to Clean the Catalytic Converter on a BMW 3 Series?
2 Answers
BMW 3 Series catalytic converters are cleaned using the drip method. This method involves connecting a plastic hose to the engine's vacuum solenoid valve. The air pressure in the hollow tube draws the cleaning agent from the infusion bottle into the engine. As the cleaning agent exits through the exhaust pipe, it cleans the catalytic converter. The catalytic converter is the most important external purification device installed in a vehicle's exhaust system. It converts harmful gases such as CO, HC, and NOx emitted from the vehicle's exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. A catalytic converter generally consists of four parts: the shell, vibration damping layer, substrate, and catalyst coating. Shell: Made of stainless steel to prevent oxide scale from falling off, which could clog the substrate. Vibration 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 together with adhesive. Substrate: Made of honeycomb-shaped ceramic material, though many are also made of metal (including stainless steel). Catalyst: Composed of precious metals such as platinum, rhodium, and palladium, sprayed onto the substrate to form the purifying agent.
To clean the catalytic converter of a BMW 3 Series, I usually start with fuel additives like Cataclean or similar brands. Just pour it into the fuel tank, fill up with gas, and then drive about 50 to 100 kilometers on the highway to let the additive flush out carbon deposits and pollutants. I remember when I first got this car, I encountered abnormal exhaust smoke, and after adding the cleaner, the improvement was noticeable. Doing this regularly can prevent clogging and save a lot of money on repairs. However, if the engine light comes on or the exhaust is abnormal, additives might not work, and then you’ll need to consider professional removal and cleaning. The catalytic converter is a crucial component for processing exhaust gases. Using high-quality gasoline and maintaining it well can extend the engine’s lifespan and protect the environment.
