The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system, which can transform the harmful gases such as CO, HC and NOx discharged from the automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. The blockage of the three-way catalytic converter will cause the following effects:

1. Exhaust emissions exceed the standard, three-way catalytic converters are blocked, and harmful gases such as CO, HC and NOx are directly discharged. Fuel consumption increases, the blockage of the three-way catalytic converter will affect the normal operation of the oxygen sensor, which will affect the accuracy of the oxygen sensor signal received by the engine, so that the fuel injection, intake and ignition can not be accurately controlled, and the fuel consumption will increase;

2, the exhaust is not smooth, power decline, this is more obvious in the turbocharged model, after the blockage of the three-way catalytic converter, when the high-pressure exhaust is needed, the exhaust is not smooth due to the blockage, which affects the intake volume, which leads to the engine power decline, and then the power decline, refueling is weak;

3, the engine jitter, fault light, often flame out, the three-way catalytic converter is seriously blocked, due to the failure to discharge the exhaust gas in time, will inevitably cause the back overflow, when the pressure exceeds the pressure value of the engine discharge back to the combustion chamber will make the engine shake, gasp until flame out;

4, spontaneous combustion, the normal working temperature of the three-way catalytic converter is generally 400-800 ° C, once blocked, affecting the exhaust, so that the high-temperature gas accumulation, resulting in the three-way catalytic converter, exhaust pipe continues to heat up, when the temperature rises to the ignition point of the adjacent components or the object that is relatively easy to light touches the red exhaust pipe, it is easy to spontaneous combustion.

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