What symptoms indicate that the spark plugs should be replaced

The purpose of spark plug is to ignite, when the cylinder is running to the top dead center, through the spark plug ignition, gasoline can be burned to produce energy. Therefore, the better the spark plug ignition ability, if the spark plug ignition ability is poor, will miss the best ignition time, leading to incomplete combustion of gasoline, and the gasoline after combustion is not fully used to do work. The intuitive feeling is that the car has poor power, high fuel consumption, and there will be a lot of invisible carbon accumulation. Replacing spark plugs is also a regular maintenance item. It needs to be replaced regularly. How many kilometers should be replaced? What symptoms of the car must be replaced?

There is a general mileage, the ordinary spark plug about 40,000 kilometers replacement, platinum plug 80,000-100,000 kilometers replacement, the normal situation of the car to follow this mileage is ok. There are a lot of maintenance manual recommended replacement mileage is shorter than this mileage, the ordinary spark plug 30,000 km to replace, you can appropriately extend the mileage, because the vast majority of cars 30,000 km spark plug ignition performance is still very good. The reason why the manufacturer asked for early replacement is that the 30,000km car is still relatively new, so they want to keep the car in a very good condition, in order to enhance the reputation of the car.

The above mileage is normal car under the circumstances, if driving very violent, or used to pull goods often full load, need to be replaced in advance. In addition, it is common that the spark plug is broken. Many old drivers do not change the spark plug for a long time, to the mileage also do not change, think not bad can use it, until a spark plug is broken only to replace, some even which is broken to replace which. This is not the right way to maintain a car, even if the spark plug is not broken, but the ignition ability decline, will affect the power and fuel consumption, but every day to decrease a little, the change is very slow I did not notice it.

If a spark plug is broken, the sign is that the engine is shaking badly and the acceleration is obviously weak. Because of the lack of a cylinder, the natural work is not stable, power decline. If there is a computer detector, it is easy to detect which cylinder is not working. If there is no computer detector, you can pull out the cylinder line one by one to test. After pulling out a cylinder line, if the shaking is more serious, it is not the cylinder spark plug broken. If the shaking does not change the severity, it means that the cylinder spark plug is broken, take it apart and check it.

Spark plugs have not reached the number of miles to replace the broken, generally only replace a broken can, if close to the number of miles to replace, it is recommended to replace all. For example, the spark plug should be replaced at 100,000 km. It is recommended to replace all the spark plugs when one is broken at 80,000 km. If one is broken at 60,000 km, only one can be replaced. There is no specific mileage standard for replacing all of them. In the case of a broken one, one or two other spark plugs should be removed for inspection. In the case of good burning condition and small clearance, it is not necessary to replace all of them.

The spark plug should change the common phenomenon is the engine shake, idle speed is not stable, not good ignition, fuel consumption increase, power decline. If these phenomena occur, the spark plug to replace the cycle, first consider replacing the spark plug. Remove the spark plug and determine the combustion state of the cylinder by looking at the spark plug electrodes. If the electrode is clean and tan, the combustion is good. If there is carbon deposition on the electrode, it is black, indicating that the cylinder is not burning well. In addition to the spark plug to be replaced, but also to check for other faults. There is also a standard to determine whether to replace, look at the electrode gap, the gap is larger, you need to replace, but first you need to know the new spark plug electrode gap is how big, with comparison to know whether it is larger.