1, the mixture is too thin:

The reason may be that there is a fault in the oil circuit or intake system: the fault in the oil circuit is mainly caused by too little fuel injection from the injector, and the main reasons for too little fuel injection from the injector are: the oil pressure is too low; The fuel injector is blocked. The fault of the air intake system is mainly caused by the excessive air intake, which is mainly caused by the fault of the sensor controlling the air intake; Air leakage in the intake manifold.

2. There is something wrong with the ignition system:

Mainly due to insufficient ignition energy (high voltage line resistance is too large; Ignition coil is damaged; Insufficient power supply voltage) or spark plug failure.

3. The ignition advance angle is too large;

The main reasons are: CKP (Crankshaft Sensor) gap is not suitable; CKP is loose; The temperature sensor is damaged; Engine load; The electronic control unit is damaged.

4. The ignition advance angle deviates from the correct position too much.

Fault phenomenon: If the engine has both backfire sound and shooting sound, it is very serious, and most of the high-voltage lines of different cylinders are inserted incorrectly. If the phenomenon is not serious, but intermittent and seemingly regular, it is mostly a crack in the distributor cover, which leads to a fire between cylinders.

Answered on June 28, 2020

Agreed 1

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What are the reasons for tempering?

The main reasons for tempering are: 1, and the mixture is too thin: the reason may be that there is a fault in the oil circuit or the air intake system: the fault in the oil circuit is mainly that the fuel injection quantity of the injector is too small, and the main reasons for the fuel injection quantity of the injector are: the oil pressure is too low; The fuel injector is blocked. The fault of the air intake system is mainly caused by the excessive air intake, which is mainly caused by the fault of the sensor controlling the air intake; Air leakage in the intake manifold. 2. Ignition system problems: mainly insufficient ignition energy (high voltage line resistance is too large; Ignition coil is damaged; Insufficient supply voltage) or the spark plug fails. 3. The ignition advance angle is too large; The main reasons are: CKP (Crankshaft Sensor) gap is not suitable; CKP is loose; The temperature sensor is damaged; Engine load; The electronic control unit is damaged. 4. The ignition advance angle deviates from the correct position too much: if the engine has both backfire and shooting sounds, and it is very serious, it is mostly because the high-voltage line in the cylinder is inserted incorrectly. If the phenomenon is not serious, but intermittent, it seems to be regular, most of them are cracks in the distributor cover, which leads to a fire between cylinders.

His royal highness Kc

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How did tempering happen?

A metal heat treatment process in which the quenched workpiece is reheated to an appropriate temperature lower than the lower critical temperature Ac 1 (the initial temperature at which pearlite transforms into austenite during heating), and then cooled in air, water, oil and other media after heat preservation for a period of time. Or heating the quenched alloy workpiece to a proper temperature, keeping the temperature for a certain time, and then slowly or rapidly cooling. Tempering process is essentially a complex transformation process of heating molten steel in a certain temperature range, which makes the thermodynamically unstable structure in steel change into a stable state. Function is generally used to reduce or eliminate internal stress in hardened steel parts, or reduce their hardness and strength, thus improving their ductility or toughness. The quenched workpiece should be tempered in time, and the required mechanical properties can be obtained through the cooperation of quenching and tempering. Low temperature tempered workpiece 150~250℃ life extension data tempering. The purpose is to maintain the high hardness and wear resistance of the quenched workpiece, reduce the quenching residual stress, and obtain tempered martensite after brittle tempering, which refers to the structure obtained when quenched martensite is tempered at low temperature. Mechanical properties: 58 ~ 64 HRC, high hardness and wear resistance. The scope of application is mainly applicable to all kinds of high carbon steel tools, cutters, measuring tools, molds, rolling bearings, carburized and surface hardened parts, etc. References:

Baidu encyclopedia-tempering

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