Audi Q5 emits white smoke and is difficult to start, and Audi Q5L emits black smoke from cold start

The gasified exhaust gas discharged after the combustion of white smoke gasoline, the exhaust gas contains a small amount of water, and the weather is cold in winter, and the hot gas is discharged and volatilized into similar vapor when it is cold, which is white.

Automobile engines generally only emit three kinds of exhaust gases, white is normal, blue burns oil, and black engine power is not enough to consume gasoline.

The cold car starts to emit black smoke for about ten seconds, what is going on with the gods, and the black smoke is emitted for about ten seconds when the cold car starts, what is going on with the gods?Black smoke performance: the engine shakes, the exhaust pipe has an abnormal sound, and at the same time, the black smoke body is discharged, and it feels weak when accelerating.

Reason: There are many reasons for the failure of black smoke, and if it is black smoke from the carburetor carburetor truck, the reason is more complicated. For example, when starting cold, the spark plug does not work well, and the motor can only be started after half a day, so that the mixture accumulated in the Qiyu cylinder cannot be completely burned, and black smoke will naturally be discharged; Or the ignition time of the vehicle is incorrect, and the early or wrong time will also cause black smoke to be generated.

There is very little black smoke from the electric spray truck, and if there is black smoke coming out of Gao Zhen next to the smile, it is most likely that there is a fault in the cylinder body. "Broken cylinder" is a common one. Method:

Carburetor cars are now basically old, to often check the carburetor and other parts of the aging degree, carburetor car is different from EFI cars, to frequent maintenance and adjustment, develop a good habit of using the car to touch the ruler. The EFI truck should check the cylinder line every 30,000 kilometers, check the spark plug every 10,000 kilometers, and replace the problem in time. Turbocharged and in-cylinder direct-injection engines have this condition, which is only caused by the mixture being too thick and not burning enough.

1. White smoke from the exhaust pipe is the water vapor discharged from the exhaust pipe.

2. If the cooling water of the water tank is reduced: it means that the engine cooling channel or cylinder gasket is damaged, which causes the cooling water to enter the cylinder for combustion.

3. There is no shortage of cooling water: caused by water entering the exhaust pipe for some reason (rain or car washing).

4. White smoke from the exhaust pipe is absolutely abnormal. It is best to detect the cause, otherwise the exhaust pipe will cause corrosion to the exhaust pipe for a long time, and the exhaust pipe will be rusted and damaged in advance.

Hello, take a look at the wastevalve.

If the quality of the oil used is poor or the viscosity grade does not meet the requirements of the vehicle, the role of lubricating the engine will be relatively poor, which will make the wear of the cylinder wall and piston ring worse, reduce the sealing performance, and thus burn the oil. Although the air-fuel ratio in the hall is also strong when idling, the total amount of fuel is not large, and it is only necessary to keep the engine running normally. When the throttle is urgent, the engine computer will control the fuel injection pulse width of the fuel injector to increase and increase the air-fuel ratio, so as to achieve the purpose of the driver's rapid acceleration, which will generally emit black smoke.

Overhaul processFirst of all, after understanding, the owner uses diesel fuel filled by regular channels, all the problems of excessive fuel can be eliminated, and the engine high-pressure oil pump speed control rod is not stuck in the maximum fuel supply position, check the throttle motor, fuel injection pump speed control rod and throttle cable are normal; When the turbocharger was inspected, it was found that the turbocharger floating bearing was severely worn and the clearance was large, and when the intercooler was opened, it was found that there was a large amount of oil in the intercooler.

The intercooler oil was removed, and the turbocharger was replaced. Cause of Penner failure: To put it simply, the root cause of the failure is the wear of the floating bearing of the turbocharger of the engine, which causes a large amount of oil to enter the intake pipeline, thereby entering the combustion chamber, causing the engine to be at high speed and have blue smoke from burning oil.