How to repair the cause of excessive mixing?

The reasons for excessive mixed gas are: 1, dirty air filter and clogged filter screen. 2. The throttle is not fully opened. 3. Improper cleaning of the main metering hole causes the loss of metering hole and increases the flow. 4. Sensor failure.

1. The air filter is too dirty and the screen is blocked.

If the oil level in the float chamber is normal, remove the air filter and check whether the throttle valve is fully opened in the vertical position. If the throttle is stuck or not in the fully open position, it should be repaired and then tested.

2. The throttle is not fully opened.

The opening position of the choke valve is normal, and there is no hairpin phenomenon. The air filter is not installed and the test is normal. You can check whether the air filter element is blocked because it is too dirty and should be cleaned or replaced with a new one.

3. Improper cleaning of the main metering hole causes the loss of metering hole and increases the flow.

Remove the fuel injector for further inspection. First, check whether the vacuum and mechanical fuel-saving ball valves are closed tightly. If the closure is not tight, the main metering hole should be considered and adjusted or replaced.

4. Sensor failure.

Sensors mainly check water temperature sensor, air flowmeter and oxygen sensor. For the water temperature sensor, check the resistance value of the water temperature sensor, and the resistance value should decrease with the increase of temperature.

The air flow meter is mainly used to check the air intake at idle speed and acceleration. The air intake at idle speed is not more than 2.8g/s, and the oxygen sensor is mainly used to check the output voltage. If it changes less than 8 times in 10 second or the voltage exceeds the range of 0. 1-0.9V, the oxygen sensor is damaged.