Driving school: fault diagnosis such as black smoke at high speed of the car

How to deal with high engine speed?

Reader Miss Wu asked: My car has been in use for six years, but recently I found that the engine speed is relatively high when the car is driving, what should I do?

Reply: For this kind of phenomenon, first of all, there may be a problem with the clutch, which is caused by wear and tear after a long time of use. If you feel that the power and fuel consumption have not changed much now, you can continue to use it. Any changes will require replacement of the clutch kit. Secondly, it may also be the problem of the instrument itself, that is, the instrument indication is not allowed.

What causes black smoke when accelerating?

Reader Mr. Tang asked: When I was using the car recently, I found that black smoke came out when the car was accelerating. What is the reason?

Reply: If such a situation occurs, it may be the cause of the intake pressure sensor. It is recommended to use a maintenance diagnostic instrument to check the control system. There is also the reason for the fuel pressure. Use the fuel pressure gauge to test the oil pressure. If it is too high, the above phenomenon will be caused.

The fuel pump of the car has been replaced, and the black smoke will also appear when the model is wrong. Then there is the oil leakage, that is, the oil leakage of the injector, which causes the mixture to be too thick, which will also bring about the above phenomenon.

If the ignition time is too late, it will also cause a decline in power and poor fuel economy, and it will also cause the vehicle to burn badly and produce black smoke.

After wiping the throttle valve

What should I do if there is an abnormal noise in the ignition?

Reader Miss Huang asked: When I used the car recently, I saw that the throttle valve was dirty, so I wiped the throttle valve myself. What is the cause?