When the weather becomes cold, the excavator of Shengang will have some fault phenomena, such as difficult cold start, shaking idle speed after cold start, poor acceleration after cold start, etc. the fault phenomenon will not disappear until the water temperature of the vehicle rises. Experts believe that this is mainly caused by excessive carbon deposition inside the engine.
Two reasons for carbon deposition there are many reasons for carbon deposition inside the engine. For most car owners, the main reasons for carbon deposition are fuel quality and urban road conditions.
During storage and transportation, gasoline with uneven fuel quality is prone to oxidize with air to form colloidal substances, or the content of colloid in gasoline itself is very high. These colloids enter the combustion chamber with gasoline through the vehicle's fuel supply system, and then burn together with gasoline, which will make the fuel injector in the fuel supply system, the engine's combustion chamber, piston ring groove, spark plug, the back of inlet valve There is a lot of carbon deposition in the air inlet and other parts.
When driving on congested urban roads, the vehicles are always in a stop and go state. The engine cannot run at high speed, and the fuel or lubricating oil jumping into the combustion chamber cannot burn 100%. Some unburned fuel forms colloid under the action of high temperature and oxygen, adheres to the surface of parts inside the engine, and then forms carbon deposition under the action of high temperature.
Too much carbon deposit is easy to cause fault. It is inevitable that the engine will cause carbon deposit when it works. However, when there is too much carbon deposit in various parts of the engine, different fault phenomena will occur.
For example, when there is too much carbon in the combustion chamber, the compression ratio of the engine will increase, forming many hot surfaces, causing early combustion and deflagration, and shortening the service life of the engine; There is carbon deposit on the working surface of the valve and its seat ring, which will cause air leakage due to lax valve closing, resulting in poor engine starting, weak operation and easy valve ablation; Carbon and glue deposit on the valve guide and valve stem will accelerate the wear of the valve stem and valve guide, and even cause the valve stem to move astringently and jam in the valve guide, resulting in the failure of sticking the valve; The fuel injection nozzle carbon deposition will cause the fuel injection quantity of the fuel injection nozzle of each cylinder to be different, and make the engine shake; When too much carbon is deposited on the spark plug, the spark plug leaks electricity and cannot work, causing the engine to shake.
Therefore, experts suggest that car owners should pay more attention to maintenance and regularly clean the carbon deposits in the engine in order to make the engine work better.
