The second reason for the damage of the car ignition coil

When the engine is working, many factors will cause carbon deposits to be formed more or less. Coking is a product formed by gasoline or engine oil under the action of high temperature and oxygen. When the engine is working, it is impossible for gasoline or oil that has entered the combustion chamber to burn 100%. Under the catalytic action of high temperature and oxygen, the unburned part of the oil forms a hydroxy acid and resin-like colloid, which adheres to the surface of the parts, and then passes through. The high temperature further shrinks into a complex mixture of asphaltenes and oil cokes, the so-called carbon deposits. Carbon deposits on the cylinder head will reduce the cooling effect of the engine. Because the thermal conductivity of carbon deposits is extremely poor, its thermal conductivity is only one-fifth of that of cast iron, which will cause the engine to overheat and greatly reduce the power and economy of the engine. Carbon deposits on the top of the piston will form many hot surfaces, causing pre-ignition and deflagration, knocking, knocking and abnormal wear, shortening the service life of the engine.

The carbon deposits on the working surface of the valve and its seat ring will cause the valve to be closed loosely and leak air, and the engine will be difficult to start, the work will be weak, and the valve will be easily ablated. The carbon deposits on the valve guide and the valve stem will accelerate the wear of the valve stem and the valve guide, and even cause the valve stem to move in the valve guide and become stuck. Carbon deposits in the piston ring groove will make the edge gap and back gap of the active cold ring smaller, or even have no gap; the end gap is affected by carbon deposits and there is no expansion clearance; at this time, it is easy to cause the piston ring to lose its elasticity and the cylinder seal to fail. Strict, or even break the piston ring and pull the cylinder. The poor quality of our gasoline and poor high gear and low speed driving are more likely to cause carbon deposits. There is also a valve oil seal, the damage of the piston ring (many are also related to the quality) and the blockage of the crankshaft ventilation valve, etc., the oil is mixed into the combustion chamber, and it is easy to deposit carbon together. Driving habits can reduce the buildup of carbon deposits.

Another is that the combustible mixture of the engine is lean and rich, causing idle jitter after cold start. Sometimes it will also lead to the phenomenon of lack of cylinder.