The second reason for the damage of the car ignition coil
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.