Ask the old driver about the carbon deposit of direct injection engine in Qi Jun.

There are two main demolition methods-"no demolition" and "disintegration". It is very simple to use the fuel system cleaning protective agent to clean the engine. The specific usage and precautions are the same as those of the EFI nozzle introduced in the last issue. When the engine is working, the fuel additive cleaning agent is sucked into the oil supply pipeline by the fuel pump together with the fuel. With the flow of fuel, not only can the glue in the fuel tank, the filter screen of the gasoline pump and the glue and carbon deposit on the fuel nozzle be cleaned, but also the carbon deposit on the valve and engine cylinder can be automatically cleaned when the engine works normally, so that the engine can be rejuvenated and rejuvenated. Because the gum washed from the fuel tank, fuel pump filter screen and fuel pipeline will be deposited in the gasoline filter, the fuel filter (gasoline grille) must be replaced in time after disassembly and cleaning. It is necessary to remind the car owners once again that the chemical cleaning components in the cleaning agent have a certain corrosive effect on the rubber oil supply pipeline. When using this method, we must pay attention to the service cycle and interval, otherwise it will accelerate the aging and corrosion of fuel rubber oil supply pipeline.

"Disassembly-free cleaning" is simple and labor-saving, as long as the right method is used. However, for engines with serious carbon deposition, this method is not sufficient and cannot achieve the goal of thorough cleaning. After "disassembly-free cleaning", if the working performance of the engine is still not good, the technician tells you that the problem is caused by too much carbon deposition in the valve and cylinder, then the engine should be disassembled to solve it. Cleaning the valve carbon deposit is relatively simple. After the intake manifold is removed, it can be removed by hand or soaked in cleaning medicine. As for the cleaning of carbon deposits in engine cylinders, it is necessary to "make a big move", first remove the cylinder head and timing belt before cleaning. Because the power and sealing performance of the engine will be worse than that of the original factory after disassembly and reassembly, it is generally not recommended to clean the carbon deposits in the engine cylinder frequently. As a last resort, it must be carried out in a regular repair shop, otherwise the engine performance will be greatly reduced.