Types of carbon deposits
Carbon buildup can be divided into two types: valve and combustion chamber carbon buildup and intake tube carbon buildup.
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1, valve, combustion chamber carbon
Cylinder every time you work is the first injection and then ignition, when we turn off the engine the moment the ignition is cut off immediately, but the work cycle of the gasoline can not be recycled, can only be adhered to the intake valve and combustion chamber wall, the gasoline is easy to volatilize, but the gasoline in the wax and gelatinous material but stayed down, in the long run in the gasoline in the wax and gelatinous material is thicker and thicker, repeated heat hardened carbon deposits are formed.
If the engine burns oil or is filled with low quality gasoline with more impurities, then the valve carbon deposits will be more serious and form more quickly.
As the structure of carbon deposits similar to a sponge, when the formation of carbon deposits in the valve every time the fuel injected into the cylinder will have a part of the adsorption, so that the real mixture into the cylinder of the concentration of dilute, resulting in poor engine performance, start-up difficulties, unstable idle speed, acceleration, poor acceleration, sharp refueling backfire, exhaust gas exceeds the standard, fuel consumption increased and other abnormal phenomena.
If more serious will cause the valve closure is not tight, so that a cylinder due to the lack of cylinder pressure and not work completely, and even sticky valve so that it does not return to the position. At this time, the valve and piston will produce movement interference, and ultimately damage the engine.
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2, intake pipe carbon
As the entire engine piston work is not synchronized, when the engine is off, some cylinders of the intake valve can not be completely closed, some unburned fuel evaporation and oxidation will be in the intake pipe, especially behind the throttle to produce some of the softer black carbon.
On the one hand, these carbon deposits will make the walls of the intake pipe become rough, and the intake air will swirl in these rough places, affecting the intake effect and the quality of the mixture.
On the other hand, these carbon deposits will also block the idling channel so that the idle control device is stuck or out of its adjustment range, which will cause low idle speed, idle shivering, all kinds of ancillary equipment speed are out of order, fuel collection and car, exhaust gas exceeds the standard, fuel consumption and other phenomena.
If you are driving in the slow speed, urgent refueling backfire, cold start difficult phenomenon, your car's valve is likely to have carbon deposits.
Found that the idle speed is low and idle car shivering, no idle after changing the battery, then your car's intake pipe has accumulated carbon is very serious. With the above phenomenon, you should go to a professional repair store in time to check the car.
Symptoms of carbon buildup
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1, difficult to start
Cold car many times ignition is not easy to start, hot car normal.
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2、Idle speed is unstable
Engine idles erratically, high and low.
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3、Weak acceleration
When you add oil, you feel that the acceleration is not smooth, and there is the phenomenon of boredom.
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4. Lack of power
Driving powerless, especially in overtaking, slow speed response, can not achieve the original power.
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5、Excessive exhaust fumes
The exhaust gas is blinding, pungent, and seriously exceeds the standard.
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6. Increase in fuel consumption
Fuel consumption increases than before.
The harm of carbon deposits
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1, when carbon adheres to the intake and exhaust valve...
When carbon adheres to the intake and exhaust valves, the intake and exhaust valves are not closed tightly to the point of leakage, the pressure inside the engine cylinder decreases, the direct result is that the engine activation is difficult, idling conditions appear shaking; at the same time, affecting the cross-section of the mixture into the combustion chamber, carbon can be adsorbed to a certain degree of the mixture, which reduces the power of the engine.
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2, when the carbon adheres to the cylinder, piston top...
When carbon adheres to the cylinder, the top of the piston, it will reduce the combustion chamber volume (space) to increase the cylinder compression ratio, when the compression ratio is too high, it will cause the engine to premature combustion (solid engine detonation), reduce the power power.
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3, when carbon adheres to the spark plug...
When carbon adheres to the spark plug, affecting the quality of the spark; even not jumping fire.
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4、When carbon deposits form between piston rings...
When carbon deposits form between the piston rings, it will be easy to jam the piston rings, resulting in burning oil and straining the cylinder wall.
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5. When carbon adheres to the oxygen sensor...
When carbon adheres to the oxygen sensor, the oxygen sensor can not correctly sense the exhaust gas condition, and can not correctly adjust the air-fuel ratio, so that the engine exhaust exceeds the standard.
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6、When carbon deposits form inside the intake manifold...
When carbon deposits form inside the intake manifold, it makes the interior rougher and affects the formation and concentration of the combustible mixture.
Carbon deposits prevention
Carbon diagnosis in automobile maintenance has always been a difficult problem, if you let the owner to distinguish whether the carbon is even more difficult to produce, rather than out of the problem and then repair as a precautionary measure to prevent problems before they occur, with the means of routine maintenance to maintain the normal use of the vehicle can be.
Here are a few ways to reduce