[Maintain a car every day] Fuel additives are not all advantages, be careful to burn out your three-way catalyst!
LeifCotton 
6 Hello everyone, this is a column focusing on car repair and maintenance. There are car mysteries you don’t know, and it will teach you how to avoid the big pits on the road of car ownership. I believe that not only you but also many people have a certain sense of obscurity about the car aftermarket, which will help you uncover the unknown stories of car repair and maintenance.
At present, the lifted Nissan Xiaoke is replacing the entire three-way catalytic converter assembly, and it is very embarrassing that the three-way catalytic converter has just broken at the watershed of 100,000 kilometers.
In this issue, the editor will take you to an in-depth understanding: the real reason behind the fragmentation of the three-way catalytic converter!
A fault phenomenon
The owner of a free car is a middle-aged man who is honest and responsible, and his car can be described as doting.
The car owner recently found that the engine had a warning light on and the exhaust was much louder than before.
In fact, a big reason for this failure is that there is something wrong with the exhaust pipe. I don’t know that after the exhaust pipe was removed, the editor was stunned by the scene in front of me. There is a lot of gray powder in the exhaust pipe, and the powder comes from the ternary catalytic converter.
The car owner recently found that the engine had a warning light on and the exhaust was much louder than before.
In fact, a big reason for this failure is that there is something wrong with the exhaust pipe. I don’t know that after the exhaust pipe was removed, the editor was stunned by the scene in front of me. There is a lot of gray powder in the exhaust pipe, and the powder comes from the ternary catalytic converter.
There are two three-way catalytic converters on the exhaust pipe of Xiaoke, one in the first section and one in the sub-section. It was very embarrassing that the two three-way catalytic converters were broken.
After all, the three-way catalytic converter is inside the exhaust pipe, and it is really ugly and clear with the naked eye, so the editor cuts the three-way catalytic converter with an angle grinder.
There are two reasons for the fragmentation of ternary catalytic converters.
1 support gasket damage
2 high temperature sintering
However, judging from the damage of the three-way catalytic converter, there is no damage to the support gasket. On the contrary, the sintering phenomenon was found on the ceramic carrier of the ternary catalytic converter.
1 support gasket damage
2 high temperature sintering
However, judging from the damage of the three-way catalytic converter, there is no damage to the support gasket. On the contrary, the sintering phenomenon was found on the ceramic carrier of the ternary catalytic converter.
Because the ceramic carrier is highly toxic, the editor has to wear a pair of rubber gloves. The editor just scratched it gently and took off a small piece of ceramic carrier, which is normally impossible. The reason why the ceramic carrier is as brittle as a cone now is that it has experienced high temperature.
There are several major reasons for the high temperature of the second exhaust!
1 fuel additive
Nowadays people especially like to use fuel additives, which in most cases can lead to an increase in exhaust temperature. The normal working temperature of the ternary catalytic converter is 250 ℃ ~ 1000 ℃. When the exhaust temperature exceeds 1000 ℃, the ceramic carrier will age rapidly. And after adding fuel additives to the vehicle, the exhaust temperature is almost common.
2 inferior fuel oil
Inferior fuel will have an impact not only on the engine, but also on the ternary catalytic converter. Inferior fuel combustion effect is not good, there is likely to be unfinished fuel in the exhaust pipe delayed combustion, which is also one of the reasons for the high exhaust temperature.
3 carbon deposition blockage
The carbon deposition of the engine will block the ternary catalyst as the exhaust enters the three-way catalytic converter. At this time, the back pressure of the exhaust will rise, and the excess heat will accumulate if the excess heat is not lost. It is really too easy to exceed a thousand degrees, and there is a great possibility that the ternary catalytic converter will be burned directly.
See now you are also shocked, Xiaobian after seeing the broken three yuan, is really startled. In fact, the above three situations are very easy to occur in the process of using the car. Fuel additives are not all advantages, the harm of inferior fuel is also great, and the harm of carbon accumulation is the most invisible.
Owning a car is definitely a technical job, so you should be psychologically prepared.
Owning a car is definitely a technical job, so you should be psychologically prepared.
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