Hafei Lubao smelled of black smoke when he refueled. What's wrong with wasting oil

The mixture is too strong.

Fault phenomenon: the exhaust pipe of the engine emits black smoke when the car is driving, and the exhaust pipe has abnormal noise.

Reason for failure:

1, the ignition timing is misplaced, which will also make the mixture burn incompletely; Or if several cylinders of the engine don't work, there will be a small amount of black smoke.

2, the mixture is too rich, that is, the air coefficient of the excessive mixture in the cylinder is too small, and the combustion is incomplete. Part of the fuel is decomposed into free carbon at high temperature and discharged from the exhaust pipe, resulting in black smoke.

Troubleshooting:

1, if a small amount of black smoke is emitted from the engine exhaust pipe, accompanied by a rhythmic "chug" sound, it can be concluded that a few cylinders are not working or the ignition timing is inaccurate. The misfire method can be used to find out the inoperative cylinder or to check and correct the ignition timing.

2. If there is a lot of black smoke from the exhaust pipe of the engine, accompanied by shooting sound, it can be concluded that the mixture is too rich. Check whether the choke valve is fully opened in time, and carry out high-speed maintenance when necessary; After flameout, look at the main nozzle from the mouth of the oiler. If oil is sprayed or dripped, the oil level in the float chamber is too high, so it should be adjusted to the specified range, and the main metering hole should be tightened or replaced. The air filter is blocked and should be cleaned or replaced.