[Auto repair knowledge]Related knowledge of automobile spark plugs

carSpark plugWorking under very harsh conditions of high temperature and high pressure, it is one of the vulnerable parts of gasoline engines. Its performance directly affects the working conditions of the engine. Studies have shown that a multi-cylinder engine, if a car spark plug does not work, it may increase fuel consumption by 10%-15%, power drop by 18%-35%, and the co and hc content in the exhaust gas will increase exponentially. Performance drops. Therefore, the spark plug should be inspected and maintained regularly. Inspection of the technical condition of automobile spark plugs The technical status of automobile spark plugs can be inspected by the following methods in addition to the special instrument for sealing and firing test. (1) Car inspection method a. Touch method: start the engine, let it run at idle speed, touch the insulating ceramic part of the spark plug with your hand, if the temperature rises very quickly, it indicates that the spark plug is normal, otherwise it is abnormal. b. Short-circuit method: start the engine, let it run at idle speed, and then use a screwdriver to short-circuit the spark plug cylinder by cylinder, listening to the engineRotating speedHarmony changes, speed and noise changes significantly, indicating that the spark plug is normal, otherwise it is abnormal. c. Flashover method: Unscrew the spark plug, place it on the cylinder block, and useHigh-voltage lineFire test. If there is no spark or the spark is weak, it indicates that the spark plug is leaking or not working. (2) Color observation method Remove the spark plug of the car and observe. If it is russet or rusty, it indicates that the spark plug is normal; if it is oily, it indicates that the spark plug gap is out of adjustment or the fuel supply is too much, and the high-voltage line is short-circuited or disconnected; if it is smoky black, it indicates that the spark plug is hot or cold. The wrong choice or the mixed gas is thick, the oil is running up; if there are deposits between the top and the electrode, when it is an oily deposit, it means that the engine oil in the cylinder has nothing to do with the spark plug. When it is a black deposit, it means that the spark plug is carbonized and bypassed. When it is a gray deposit, it is the additive in the gasoline that covers the electrode and causes misfire; if it is severely ablated, such as scarring on the top, black pattern cracking, and electrode melting, it indicates that the spark plug of the fire car is damaged. Related: ·Use of vehicles in summer
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