If your car love is not easy to start recently、Unstable idle speed、Not smooth acceleration、Increased fuel consumption and other problems，Then you have to take a closer look at this time。The source of all this may come from one place: engine carbon deposits! Let's talk to you today。

First of all, let's know what is carbon and carbon production，What is carbon accumulation: Carbon accumulation refers to the lubricant and lubricating oil in the burning room in the burning room when it cannot be completely burned，The gel produced (the main ingredient is hydroxyl acid、asphalt quality、refueling quality, etc.)，So as to adhere to the advance/exhaust valve、Edge of the cylinder、Pistons top、Spark plug、Burning Room) After repeated high temperature of the engine，Hard -gum carbon that is constantly accumulated，That is carbon。

Reasons for the formation of carbon accumulation:

Although today's engine technology has improved quite，But the efficiency of the combustion room is only 25%--- 30%，Therefore, accumulation of carbon deposits is mainly a phenomenon caused by the machine itself，and the quality of gasoline is caused by poor quality of gasoline，Gasoline generated by general self -refining plants，The quality may be different，Therefore, the degree of influence is slightly different，But if you use solvent oil or illegal oil，will lead to more serious carbon deposits。After a period of driving in the car，The fuel system will form a certain sediment。

The formation of the sediment is directly related to the fuel of the car: first because the gasoline itself contains glue、impurities，or the dust brought in during the storage and transportation process，impurities, etc.，Volual in the car fuel tank、Oil pipes and other parts to form a deposit similar to mud; followed by unstable components such as olefins in gasoline at a certain temperature，Oxidation and aggregation reaction，A sticky and resin -like viscosity。These viscous objects are injuscit、Inlet valve、Room、(cylinder head and rarely top) will become hard accumulation of carbon。Another，Due to urban traffic congestion，Car is often at low speed and idle state，It will increase the formation and accumulation of these sediments。

I. Carbon type

Carbon accumulation can be divided into two types of carbon accumulation of carbon accumulation and air intake pipe accumulation of carbon。

1, the valve, burning room accumulation of carbonDecisions of the control characteristics of the engine，Each time the cylinder works, it is injected first and then ignited，When the moment we extinguished the engine, the ignition was cut off immediately，But the gasoline sprayed from this work cycle cannot be recycled，It can only be attached to the valve and the burning chamber wall，Gasoline is easy to volatilize，But the wax and glue in gasoline stayed down，Long accumulation of wax and glue in gasoline in the past，After repeated heating, it hard -hard up carbon。If the engine burns oil，or the quality of the injected gasoline is inferior.，Then the valve accumulation is more serious and faster formed。

The structure of carbon deposits is similar to a sponge，When the valve forms carbon deposits, a part of the fuel sprayed into the cylinder will be adsorbed，Make the mixed gas concentration that really enters the cylinder，Lead the engine's poor work，Difficulties in startup、Unstable idle speed、Acceleration bad、Quickly refueling、Tail Qi exceeds the standard、Increased fuel consumption and other abnormal phenomena。If it is seriously caused by severe valve closure，Make a certain cylinder from working without cylinder，Even adhesive valve makes it not return。At this time, the valve and the piston will generate exercise interference，The final damage engine。

2. Instant pipe accumulation of carbon

Because the work of the entire engine's piston is not synchronized，When the engine is extinguished，The valve of some cylinders cannot be completely closed，Some unburned fuels are seabet loginconstantly evolving oxidation，It will produce some softer black carbon in the intake pipe, especially behind the throttle。On the one hand, these carbon deposits will make the pipe wall of the air pipe rough，Antimony will generate vortex in these rough places，Quality that affects the effect of air intake and mixed gas。On the other hand，These carbon deposits will also block idle speed channels to stagnate the idle control device or exceed its adjustment range，This will cause low idle speed、Stranger shaking、Speed ​​speed of various subsidiaries all fails、Oil and Destroy the Car、Tail Qi exceeds the standard、Oil and other phenomena。

If you encounter slow speeds in driving，Quickly refueling，The phenomenon of cold starting difficulties，The valve of your car is likely to have accumulated carbon。I found that the idle speed is low and the car shakes when idling，issue a card when I step on the throttle，No idling after changing the battery，So your car's air intake pipe has been accumulated very serious。With the above phenomenon, you should go to the professional maintenance store to check the car in time。

2, carbon accumulation symptoms

Cold cars are not easy to start with multiple ignition, and hot cars are normal.

The engine's idle speed is unstable, and it is high and low.

When adding oil, it feels poorly accelerated and has the phenomenon of dullness.

Powerful driving,Especially manifested in overtaking,Slow speed of speed up,Can't reach the power of the original car。

The exhaust gas is very dazzling, pungent, and serious.

fuel consumption is increased than before.

3, diagnostic method

The diagnosis of carbon accumulation of air intake pipes in automobile maintenance is very simple，As long as the throttle is removed, you can clearly see the degree of carbon deposits。But the diagnosis of carbon deposit carbon has always been a problem，Generally speaking, there are three diagnostic methods in professional maintenance stores。

1, disintegration method

That is to disassemble the engine，Check whether there is carbon accumulation to produce。This is very intuitive，But time -consuming energy，And no matter what parts are disassembled, it will more or less affect its ability，shortening its service life。

Disassembling engine inspection and cleaning carbon，Remember to choose a trusted repair plant or 4S shop for the maintenance process，Otherwise, it will be counterproductive，Causes deep damage to the engine。

2, endoscopic inspection

Remove the spark plug or fuel injection mouth，Use endoscopy to observe the degree of carbon deposit carbon。This method is very convenient，But the cost of the endoscope is not the same as small，And its use in maintenance is not very wide，Therefore, not all maintenance companies are equipped with the device。

3. Observe the feedback voltage change

Use a diagnostic computer to read the changes in the feedback seabet appvoltage of the oxygen sensor，The existence of carbon accumulation in this time。Generally speaking, the feedback voltage of normal oxygen sensors fluctuates between 0.3 ~ 0.7V，and should be alternately changed in 8 times in 10 seconds。Once the valve produces carbon deposits，The feedback voltage of the oxygen sensor will become larger，For example, from the original 0.3-0.7V to 0.1 ~ 0.9V。and the central value of this voltage will become larger，The frequency of changing at the same time will slow。Methods to feedback voltage changes with a diagnostic computer to read oxygen sensors，But if the control system of the car itself is faulty，Can't accurately be used as a basis for judgment，It will also mislead the fault diagnosis of unwanted persons。Another way is that this method can only be used for the use of closed -loop electric injection cars，Because only a closed -loop control system is equipped with oxygen sensor。

4. Harm of carbon deposits

When the accumulated carbon adhesion is attached to the exhaust valve,Make the intake of the exhaust valve is not tightly closed or even leaks，The pressure in the engine cylinder decreases，Direct result is the difficulty of engine activation，Judging occurs under idling conditions; at the same time, it affects the section of the mixed gas entering the burning room,Carbon accumulation can adsorb a certain mixture,to reduce the engine power。

When accumulated carbon sticky in the cylinder、During the Pistons,will reduce the combustion room volume to increase the cylinder compression ratio,When the compression ratio is too high,It will cause the engine early (solid engine burst)，Reduce the power power。

When the accumulated carbon is adhesive to the spark plug,Affects the quality of sparks; even not jumping fire。

When the accumulated carbon is formed between the piston ring，It will be easy to kill the piston ring card，Causes the fuel to lighten oil and strain the cylinder wall。

When accumulated carbon adhesion to oxygen sensor，Make the oxygen sensor cannot be performed correctly，Can't adjust the time ratio，so that the engine tail gas exceeds the standard。

Danglie carbon is formed inside the intake manifold，makes the interior rough，Formation and concentration of influencing combustible mixed qi。

Five, Carbon Prevention

The diagnosis of carbon accumulation in car maintenance has always been a problem，It is more difficult to add carbon to the production of carbon accumulation if it is forced to distinguish the production of carbon accumulation，Instead of repairing a problem, it is better to prevent it from being unearthed，Use daily maintenance to maintain the normal use of the vehicle。The following introduces several methods to reduce and prevent carbon production。

1. Inject high -quality gasoline.

Unsure such as wax and glue in gasoline is the main ingredient for forming carbon，So the trend of carbon deposits with high cleanliness gasoline is weaker。Unfortunate is，At present, the quality of gasoline in my country is lower than that of developed countries，It can only be brief because it is bad。Everyone should pay attention to the high standard number is not equal to high quality，In other words, the oil on No. 97 is not necessarily less than the impurities on No. 93，Label only represents the octane value of the oil，Can't represent quality and cleanliness。

Some car owners in order to ensure the cleanliness of gasoline，The method of adding gasoline cleaner to gasoline。This can effectively prevent the formation of carbon seabet login-accumulating layers on the metal surface，And can gradually activate the original carbon -stagnant particles slowly remove，to protect the engine from injury。But the addition of gasoline cleaner must be cautious，If you add fake products, you will get the opposite effect。

2. Do not drive for a long time

Long idle time，The time when the engine reaches normal temperature will become longer，The speed of evaporation after the gasoline is sprayed on the back of the valve is slow，Carbon accumulation is also born from this。Frequent idling at the same time，The air flow to enter the engine is small，This becomes weak on the scouring effect of carbon deposits，It will promote the deposits of carbon deposits。

3. Run high -speed, try to improve the shift speed of the hand -blocking vehicle.

The purpose of multi -running high speed is to use the airflow of airflow on the airway to prevent carbon accumulation。Another，The speed of increasing the shifting shifting is also the same as the running high speed，Turn the original shift at 2000 to 2500 conversion，Not only can it effectively prevent carbon production，It can also increase the power of the car，It also avoided the explosive vibration brought by too low gear speed，Protect the engine。

Due to the road conditions of the city、The impact of people's life rhythm and the conditions of my country's fuel market conditions，The above method of avoiding carbon deposits may not be easy to achieve。So it is recommended that some car people do freely of disassembly and cleaning in the air intake system every 20,000 to 40,000 kilometers under the conditions of conventional maintenance，This can effectively reduce the effects of carbon deposits on the engine function，Keep the "heart" of the car in the state。