What symptom is the accelerator broken?

1, the engine idle speed is unstable, the high idle speed drops discontinuously, and it is difficult to start the engine, especially the cold start;

2, the engine idle speed instability or no idle speed;

3. The engine is difficult to start;

4. Insufficient engine power, poor acceleration performance and unstable operation;

5. The exhaust pipe of the car emits black smoke, which increases fuel consumption.

Extended data:

Maintenance method

How to clean and prevent should pay attention to:

1, which should be dismantled and cleaned;

2. Correct some mistakes in cleaning the throttle valve;

3. Form

The reason of throttle scaling mainly comes from oil vapor, followed by particles and moisture in the air, that is to say, using qualified air filter and removing crankcase ventilation pipe, throttle scaling will be much slower.

The crankshaft is built in the crankcase, and the lower part is connected with the oil bottom. The working temperature of this part is about 100 ~ 180.

Release gas

Engine oil will be heated and volatilized during use. The longer the use time, the higher the temperature and the stronger the volatilization. In addition, the compressed gas of the cylinder will squeeze into the crankcase through the gap of the piston ring, so there must be a channel for the gas to escape, otherwise the oil bottom will form positive pressure.

Negative pressure suction

The reason why the crankcase ventilation pipe is connected to the throttle valve is the requirement of environmental protection on the one hand, and the gas is pumped out of the crankcase by using the negative pressure of intake air on the other hand. When the oily steam reaches the intake pipe and cools, the oil in it will condense on the intake and throttle valve, and then the carbon deposit in the steam will also be deposited on these parts. Because the air flow is the largest in the gap where the throttle valve is opened, the space is small and the gas temperature is low, this part is the easiest to condense.

Cleaning frequency

Therefore, how long the throttle will be dirty depends on the quality of the air filter, the brand and quality of the engine oil, the condition of the driving section, the temperature, the working temperature of the engine, driving habits and so on. Even for individuals, it is impossible to determine the time to clean the throttle with a fixed number of kilometers. The interval between cleaning the throttle for the first time in a new car is the longest. Later, due to the continuous condensation of oil and gas in the crankcase ventilation pipe and intake port, the cleaning frequency will increase, and different weather conditions will also affect the dirty speed of the throttle.

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