What are the symptoms of a spark plug that is too tight?

Tightening the spark plugs can cause damage to the spark plugs and difficulty replacing them, while loosening them can cause the engine to run erratically and shoot. You don't need to tighten the spark plugs. The torque of the spark plug is required, and different types of engines have different torque requirements, which may also cause trouble in removing the spark plug, or damage the screw hole of the engine. As a vulnerable and consumable part of the car, the spark plug must have a service life and needs to be replaced many times during the entire life cycle of the car. Regular replacement of spark plugs is of great significance to the stability of engine performance, and the working conditions of spark plugs will more or less affect the power and fuel consumption of the car. The service life of spark plugs of different materials is also different. Ordinary copper spark plugs have a service life of 30,000 kilometers, platinum spark plugs can reach 80,000 kilometers, and iridium spark plugs can even reach more than 100,000 kilometers if used properly.
If the spark plug is tightened too tightly, it will cause trouble when taking it out, and the root of the spark plug may be twisted off. The probability of quality problems in the spark plug itself is very small. According to statistics, 95% of spark plug failures are caused by human factors. How to replace the spark plug: Open the engine cover, disassemble the engine panel, and check the cylinder line. Generally speaking, if the engine has several cylinders, there are several cylinder lines. Pull out the cylinder line directly by hand, but be sure to note that one cylinder line corresponds to one spark plug, and remember the order in which the cylinder lines are pulled. Unscrew the spark plug with an extension socket. Just installed a new spark plug, but the gap of the spark plug is very important. If the gap is too small, it is easy to burn out. If the gap is too large, the ignition will be weak or even cut off. The general gap is 0.7-0.9 mm. You can tell whether the spark plug is tightened by the sound of leakage.
Although the spark plug is a small part of auto parts, its role can never be ignored. Spark plugs need to dissipate heat. If not tightened, they will not fit snugly against the cylinder head, resulting in poor heat dissipation. The spark plug, a seemingly inconspicuous small part, can be said to play a very important role, and it is a vulnerable part that needs to be replaced regularly. Due to the problem of cost control, automakers may not choose the spark plug with the best performance, but it can guarantee the normal operation of the vehicle. When the vehicle enters the maintenance link, it will face the choice of updating the spark plug. At present, the common spark plug brands on the market include Bosch of Germany, Denso of Japan, NGK of Japan, AC Deco of the United States, and self-dissolving of the United States. Pay attention to the comparison table of spark plugs of different brands to avoid buying the wrong model.
After the spark plugs have been used for a while, it may be difficult to remove one or several spark plugs, so it will be easier to remove them after the engine is sufficiently cooled. If the spark plug is too tight, you can also use kerosene or loosening agent to drip on the gasket and thread of the spark plug, and turn the spark plug smoothly and firmly until the spark plug is loose. Before disassembling the spark plug, blow off the dust around the spark plug to prevent the dust from falling into the combustion chamber after the spark plug is unscrewed. The sleeve cannot be tilted, otherwise the spark plug insulator will be easily damaged.