How to clean up carbon deposits in various parts of the car

Nowadays, the more people buy a car, the more attention is paid to the maintenance, and the car maintenance is good or bad, and the car can be expressed on the road. Without timely maintenance and repair, the car may be overhauled over time. Therefore, we must do maintenance in time, the following small series to tell everyone about the carbon deposits in various parts of the car.

The carbon deposit can be divided into two types: the valve, the carbon deposit in the combustion chamber and the carbon deposit in the intake pipe.
The carbon deposits in the valve and combustion chamber are determined by the control characteristics of the EFI engine. When the cylinder is working, it is injected first and then ignited. When we extinguish the engine, the ignition is cut off immediately, but the work cycle is sprayed. Gasoline can't be recycled. It can only be attached to the intake valve and the combustion chamber wall. The gasoline is easy to volatilize, but the wax and gelatin in the gasoline are left. In the long run, the wax and the gelatin in the gasoline accumulate. The thicker it is, the harder it is after being heated and the carbon is formed. If the engine burns oil, or if the injected gasoline is of poor quality, the carbon deposits are more serious and the speed is faster. Since the carbon deposit structure is similar to a sponge, when the valve forms carbon deposit, a part of the fuel injected into the cylinder will be adsorbed, so that the concentration of the mixture actually entering the cylinder becomes lean, resulting in poor engine operation, difficulty in starting, and idle speed. Abnormal phenomena such as stability, poor acceleration, rapid fueling and tempering, excessive exhaust gas, and increased fuel consumption. If it is serious, the valve will not be closed tightly, so that a cylinder will not work completely because there is no cylinder pressure, and even the valve will not be returned. At this point, the valve and the piston will have motion interference, which will eventually damage the engine.

Intake pipe carbon deposit

Since the operation of each piston of the whole engine is not synchronized, when the engine is extinguished, the intake valves of some cylinders cannot be completely closed, and some unburned fuel is continuously evaporated and oxidized, which will produce some in the intake pipe, especially behind the throttle. Soft black carbon deposits. On the one hand, these carbon deposits will roughen the pipe wall of the intake pipe, and the intake air will generate vortices in these rough places, affecting the intake effect and the quality of the mixture.

On the other hand, these carbon deposits will block the idle speed channel, causing the idle speed control device to be stuck or beyond its adjustment range, which will result in low idle speed, idling, failure of various accessory devices, oil removal, and exhaust. Excessive standards, oil and other phenomena.

If you are experiencing slow acceleration during driving, tempering and tempering, and difficulty in cold start, the valve of your car is likely to have accumulated carbon. It is found that the idle speed is low and the car is shaking when idling. When the accelerator is pressed, the card is issued and the battery is not idling. Then the air intake pipe of your car has accumulated carbon. With the above phenomenon, you should go to the professional repair shop to check the car in time.

The diagnosis of carbon deposits in the intake pipe in vehicle maintenance is very simple. As long as the throttle is removed, the degree of carbon deposition can be clearly seen. However, the diagnosis of valve carbon deposition has always been a problem. Generally, there are three diagnostic methods in professional repair shops.

1. Disintegration method

That is, take the engine apart and check if there is carbon deposit. This is intuitive, but time consuming and laborious, and no matter what components are disassembled once, it will affect its performance more or less, reducing its service life.

2, endoscopy

Remove the spark plug or the injector and use an endoscope to observe the degree of carbon deposits on the valve. This method is very convenient, but the cost of the endoscope is very small, and its use in maintenance is not very extensive, so not all maintenance companies are equipped with the equipment.

3. Observe the feedback voltage change

A diagnostic computer is used to read the change in the feedback voltage of the oxygen sensor to indirectly detect the presence of carbon deposits. In general, the normal oxygen sensor feedback voltage fluctuates between 0.3-0.7V, and there should be 8 alternating maxima and minima in 10 seconds. Once the valve produces carbon deposits, the feedback voltage fluctuation of the oxygen sensor will become larger, such as from the original 0.3-0.7V to 0.1-0.9V. Moreover, the center value of this voltage will become larger, and the frequency of change will slow down. The method of reading the change of the feedback voltage of the oxygen sensor by the diagnostic computer saves time and effort, but if the control system of the vehicle itself is faulty, it cannot be accurately judged as a basis for judgment, and misleading the diagnosis ideas of inexperienced personnel. Furthermore, this method can only be used for closed-loop EFI vehicles because only closed-loop controlled systems are equipped with oxygen sensors.

In the maintenance of automobiles, the diagnosis of carbon deposits has always been a problem. It is even more difficult for the owner to distinguish whether there is carbon deposit. It is better to prevent problems before they are repaired, and to maintain them by routine maintenance. The normal use of the vehicle is a last resort and can only be operated on.

Here are a few ways to reduce, prevent, and eliminate carbon deposits.

: Adding high-quality gasoline and wax, such as wax and colloid, is the main component of carbon deposits, so the trend of carbon deposition in gasoline with high cleanliness is weaker. Unfortunately, the quality of China's gasoline is still relatively low compared with developed countries, and it can only be simplified. It should be noted that the high number does not equal the high quality, which means that the oil of No. 97 is not necessarily less than the impurity of No. 93. The label only represents the octane number of the oil and does not represent the quality and cleanliness.

In order to ensure the cleanliness of gasoline, some car owners will use gasoline detergent in their gasoline. This effectively prevents the formation of carbon deposits on the metal surface, and gradually activates the original carbon particles to be slowly removed, thereby protecting the engine from damage. However, the addition of gasoline cleaners must be cautious. If you add a fake product, you will get the opposite effect.

Second: don't drive for a long time

The idle time is long, and the time for the engine to reach the normal temperature becomes longer. When the gasoline is sprayed on the back of the valve, the evaporation speed is slow, and carbon deposits are born. At the same time, it is often idling, and the air flow into the engine is also small, so that the scouring effect on the carbon deposit becomes weak, which promotes the deposition of carbon deposits.

Third: multi-run high speed, try to improve the shift speed of the hand block

The purpose of running high speed is to use the airflow to wash the inlet to prevent carbon deposits. In addition, the speed of shifting is also similar to that of multi-run high speed. Turning the shift to 2500 at the speed of 2000 will not only prevent the formation of carbon, but also improve the power of the car and avoid the change. The explosion is caused by the low speed and protects the engine.

Fourth: use fuel cleaning cleaning additives

Cleaning the protective agent to clean the engine is quite simple. The specific usage and precautions can be found in the product instructions.

When the engine is in operation, the cleaning agent is sucked into the oil supply line by the fuel pump along with the fuel. With the flow of fuel, it can not only clean the gel in the fuel tank, the glue on the gasoline pump filter, and the glue and carbon deposit on the fuel injector. It can also automatically clean the valve and the engine cylinder when the engine is working normally. The carbon deposits make the engine "rejuvenate" and re-energize. Since the glue cleaned from the fuel tank, the fuel pump filter and the fuel pipe will deposit in the fuel filter, the fuel filter (gasoline grid) must be replaced in time after cleaning.

It is necessary to remind the owners again that since the chemical cleaning components in the cleaning agent have a certain corrosive effect on the rubber supply pipeline, when using this method, it is necessary to pay attention to the use cycle and interval time, otherwise the fuel rubber supply pipeline will be accelerated. Aging and corrosion.

Fifth: disassemble cleaning

Simple and effortless, just use it in the right way. However, for engines with severe carbon deposits, this method seems to be incapable of achieving the goal of complete cleaning and cleaning. After the "free cleaning", if the engine performance is still bad, and the technician tells you that the problem is caused by too much carbon in the valve and cylinder, then it has to be solved by disassembling the engine.

The cleaning of the valve carbon deposit is relatively simple. After removing the intake manifold, it can be removed by hand or by using a cleaning agent. As for the cleaning of the carbon in the engine cylinder, it is necessary to "move the big move", remove the cylinder head, timing belt, etc. before cleaning.

Since the power and sealing performance of the engine will be inferior to the original factory after the engine is disassembled and reassembled, in general, the carbon deposit in the clean starting cylinder should not be carried out frequently. When it is absolutely necessary, you must also go to a regular repair shop, otherwise the engine performance will be greatly reduced.
How about, the owners are not familiar with cleaning up carbon deposits, often do some maintenance. Good for car safety. It is better to deal with any abnormality in the car in time.

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