What is the reason for the low idle speed of vehicles?

1, automobile battery voltage is low; Specific detection method: test the battery voltage with a voltage range of three meters. If it is lower than 10V, it is recommended to replace it. If it is around 1 1V, it is barely used; Be prepared to be replaced. 12V or more is ok.

2. Check whether it is caused by carbon deposition; If driving around 20000KM, check and clean the throttle.

3. Check, test and replace the spark plug.

4. The control unit receives an error signal and sends an error command, which leads to inaccurate idle intake control of the engine and abnormal engine combustion.

5. Failure of idle air actuator leads to inaccurate idle air control.

Influence of idle speed on gasoline engine;

1, economy

According to statistics, because the engine often needs to work at idle speed, about 30% of the fuel consumption of urban motor vehicles is at idle speed. Therefore, it is very important to reduce idle fuel consumption, which is also the requirement of idle speed control.

The main measure to reduce idle fuel consumption is to reduce idle speed. Foreign research shows that 100 r// every idle speed reduction in Min Min is equivalent to running one mile per gallon of gasoline. This requires that the engine speed should not deviate too much from the ideal idle speed when it is disturbed by the outside world.

2. Emissions

When the gasoline engine is idling, there will be a lot of residual exhaust gas in the cylinder. In order to ensure the combustion stability, it is necessary to add rich mixture, so the combustion is incomplete and a large number of harmful emissions of CO and HC are produced.

Experiments show that the lower the idle speed, the more obvious the dilution effect of exhaust gas, which will further increase the emission concentration of CO and HC, so increasing the idle speed is beneficial to reduce the emission of CO and HC. Relevant data and tests show that when the idle speed of automobile engine is increased from 700 rpm to 800 rpm, CO decreases 10% and HC emission decreases 15%.