Car carbon deposit is the most troublesome thing for car owners besides the ticket. Many people haven't seen it in person, but everyone is afraid of carbon deposits in their engines. Let's talk about carbon accumulation today.
What is carbon deposit
Strictly speaking, carbon deposits are a general term for some impurity deposits generated during engine operation, and are not just a substance, but a collective term for multiple substances.
Where does carbon deposits exist?
Carbon deposits can be found in these places: combustion chambers, spark plugs, backs of valves, intake manifolds, injectors, throttles.
Causes of carbon deposition
The carbon deposits in the combustion chamber and spark plug are mainly the products of incomplete combustion of the fuel after the combustion has deteriorated, and some are the impurities in the intake air that remain after combustion, most of which are particulates that are adhered to the combustion chamber after being burned at high temperature. Burning engine oil is also prone to carbon deposits. And in reality, carbon deposits in many automobile combustion chambers are mainly caused by the combustion engine oil.
The carbon deposit on the back of the valve mainly comes from the crankcase ventilation system. Because the crankcase exhaust gas is drawn into the cylinder to participate in the combustion of the engine while the engine oil in the crankcase is constantly circulating. Coupled with high temperature volatility, the exhaust gas from the crankcase contains a large amount of oil vapor.
These exhaust gases first pass through the oil-gas separation device to separate the oil particles therein, and the remaining exhaust gases enter the engine for combustion. However, in reality, the separation effect cannot be 100%, so some oil will still enter the cylinder. The only way to enter the cylinder is the back of the intake valve, where the oil particles adhere and carbonize at high temperatures.
The injectors are located on the intake manifold, so their carbon deposits are basically the same. First, during the intake process, after the mixture enters the cylinder, there may be a small amount of mixture returned from the intake valve to the intake manifold due to inertia and valve. The gasoline in these mixtures will be attached to the intake manifold, and there will also be some gasoline vapor in the continuous injection of fuel inside the intake manifold.
In addition, when some cylinders have not had time to inhale the mixture when the vehicle is stopped and stopped, it will Causes gasoline vapor to diffuse into the intake manifold. At the same time, the oil vapor brought by the crankcase ventilation system will also adhere to the inner wall of the intake manifold. With air filtration, it is not possible to completely remove dust from the air, so some small particles of dust will be mixed with the substances on the wall of the manifold. Sediment. Fortunately, these substances are more like sludge, and their texture is relatively soft and easier to clean.
The carbon deposit of the throttle is divided into two parts, the one near the intake manifold is the inner side, and the one near the intake pipe and the air filter is called the outer side. The carbon deposit here is mainly due to the backflow of crankcase exhaust gas caused by the intake pipe of the crankcase ventilation system during shutdown. The organic oil vapor in the back-flowing exhaust gas adheres to the throttle valve plate, and the dirt in the intake air is adsorbed to form sludge. Another part is that the high-speed friction generated by the airflow passing through the end of the throttle plate causes electrostatic adsorption of dust in the airflow. This type of carbon deposit is actually a mixture of oil and dust, which is quite easy to clean up.
How to check the carbon deposit of your car
The easiest way to view the carbon deposits in the combustion chamber is to remove the spark plug and then directly view it with an endoscope. The carbon deposit in the intake manifold can be viewed from the throttle through the endoscope lens, and the carbon deposit in the fuel injection nozzle can be removed for inspection. For in-cylinder direct injection vehicles, you can check it together when you check the carbon in the combustion chamber. To check the carbon deposit of the throttle, it is best to remove the intake pipe.
Impact of carbon deposits
① Carbon deposits in the injectors and intake valves cause poor fuel atomization, poor fuel supply, and unbalanced air-fuel ratios, resulting in poor engine acceleration. Idle jitter and difficulty starting.
② Carbon deposits in the throttle, idle passage, and intake port reduce air flow, making the engine idle, unstable, stalled, reduced performance, and increased emissions
③ Carbon deposits in the combustion chamber increase the compression ratio of the engine, causing knocking and knocking the cylinder. Carbon deposits may cause piston ring stagnation, reduce cylinder pressure, and affect the engine's inability to start in Shenzhen
④ The EGR exhaust gas circulation channel is blocked and causes the control valve to stagnate, idling, and exhaust emissions exceeding standards
⑤ Oil deposits caused by oil accumulation
How to clean up carbon deposits
When the amount of carbon deposit in the cylinder is small, you can use some fuel additives to clean up the carbon deposit. When refueling, add it directly to the fuel tank. Remember to choose a big brand product. At the same time, in order to prevent the washed-out carbon deposits from blocking the three-way catalyst, it is recommended to add a small amount and multiple times, and appropriately increase the speed during cleaning.
The carbon deposit in the intake manifold can be removed and washed. The carbon deposit here is relatively moist and soft and relatively easy to clean. The carbon deposits in the fuel injection nozzle can also be removed and cleaned directly, and the carbon deposits in the throttle valve can be wiped off with a wet wipe. If you want to clean up completely, remove them inside and out and wash them. But if you want to have a good carbon deposit cleaning effect, we still recommend you to use our
How to avoid carbon deposition
If you want to avoid the formation of carbon deposits, pay attention to these aspects: The engine oil should not exceed the upper limit as much as possible, otherwise it will be more likely to be stirred after hitting the crankshaft, and a large number of particles will be drawn into the engine. Change the air filter to reduce the source of impurities while protecting the air flow meter. Deal with the engine fault light immediately after lighting, because the combustion condition in the cylinder may not be good at this time.
Avoid frequent rapid acceleration, because the power demand is large during acceleration, the ECU will reduce the target air-fuel ratio, and the fuel injection is very rich at this time. Add qualified gasoline. Run high speeds regularly. Do not idle for long periods of time. Ensure that the engine works at normal operating temperatures.
As a three-way catalyst for controlling the emission of toxic and harmful exhaust gas, how should we clean it?
When we are doing maintenance, the owners probably know that the three oil filters need to be replaced regularly. If you are an experienced driver, you may also perform maintenance on the throttles, intake ducts, and fuel injectors on the engine of the car, which can make the vehicle drive lighter and save fuel. However, the three-way catalytic converter, which is closely related to the power consumption of the engine, is often overlooked and forgot to do maintenance.
A blocked three-way catalyst can make the engine work poorly. When the three-way catalyst is blocked, it will cause troubles such as poor exhaust of the engine, dull acceleration, and sharp increase in vehicle fuel consumption.
So how should we avoid the three-way catalyst being blocked? There are solutions below.
1.Add cleaning agent
A more common way is to add a cleaning agent to the fuel tank, which is simple, convenient and low cost. You only need to add the corresponding cleaning agent directly to the fuel tank. However, the cleaning effect of this method is not very good, because the cleaning agent is burned out when it reaches the three-way catalyst after burning through the combustion chamber, so the effect is not good.
2. Hanging bottle cleaning
Hanging bottle cleaning is also called no-disassembly cleaning. This method is more popular now. The advantage is that there is no need to disassemble the three-way catalyst, the disadvantage is that the cost of purchasing cleaning equipment is expensive, and the cleaning effect is not ideal.
The hanging bottle is cleaned by the suction of vacuum and suction. After the cleaning agent is sucked into the combustion chamber and burned, a high-temperature oxidation environment is established inside the three-way catalyst. The unburned products of gasoline and gasoline are converted into carbon dioxide, sulfur dioxide and other gases and then discharged out of the exhaust pipe, and finally the purpose of recovering the activity of rare metals on the three-way catalyst is achieved.
3. Disassembly and cleaning
Disassembly and cleaning is the most thorough cleaning method, but it is time-consuming and laborious. It is necessary to completely remove the three-way catalyst from the vehicle, and then soak it with a cleaning agent for a period of time before cleaning it with water. But this operation is by far the most effective cleaning method.
4.SH2.0 HHO Cleaning Machine
Adopting the most advanced HHO technology, independent research and development design. Hydrogen and oxygen are produced by electrolyzing water, and the carbon deposits are cleaned using the characteristics of hydrogen and oxygen to achieve good results. At the same time, SH2.0 added DPF and three-way catalytic converter cleaning function on the basis of cleaning the engine. Three items for three charges.
Summarizing the above 4 methods, disassembly and cleaning is the best cleaning effect, but it is time-consuming and labor-intensive and the charges are very high. The method of adding cleaning agent and hanging bottle cleaning to the fuel tank, although the operation is simple and cheap, but the cleaning effect is not very good and cannot solve the fundamental problem. Comprehensively considered, SH2.0 is easy to operate and the charges are average. The most important thing is that the cleaning effect is good.
Now most vehicles have an oxygen sensor before and after the three-way catalyst, which is used to detect the oxygen content in the exhaust. Under normal engine operating conditions, the oxygen content of the front oxygen sensor is higher than that of the rear oxygen sensor. If the three-way catalyst is removed, the oxygen content of the rear oxygen sensor will be exactly the same as that of the front oxygen sensor.
When the oxygen sensor detects that the oxygen content in the exhaust gas is too high, it will feed back the collected signal to the computer. However, the computer does not know that the three-way catalytic converter was artificially removed. It will mistakenly think that it is caused by too thin mixture of oxygen. Then the computer will send a signal to the fuel injector to inject more fuel, so that the mixed gas will be too rich and the engine Fuel consumption of abnormally working vehicles increased sharply.
For long-term driving, carbon deposition in the engine is inevitable, but it will cause great trouble if it is not prevented and resolved. It is necessary to learn to distinguish whether the state of the car has serious carbon deposits while driving, and clean up the carbon deposits of the engine in time to avoid major failures. In fact, as long as you pay attention to the above factors, you basically do not need to cost much money until the car is scrapped. Take a shower for your car!