What is the cause of Audi a6l exhaust smoke? What is the smoke from Audi a6l exhaust?

1, first check whether the choke valve is fully open; After flameout, check whether the main nozzle is tightened or whether the main metering hole needs to be replaced from the carburetor; Check whether the air filter is blocked and clean or replace it in time. Automobile exhaust pipe plays an important role in reducing vibration and noise and prolonging the life of exhaust muffler system. The main material of exhaust pipe is stainless steel. For an ordinary car, because the exhaust gas of the car leaves the engine under great pressure, the noise it produces may make people feel crazy. At this time, the exhaust pipe of the car plays the main role of silencing, and a muffler is installed inside, which greatly reduces the noise of the car.

2. Audi a6: 1 Treatment measures for black smoke from exhaust pipe. At different engine coolant temperatures, the resistance value of the coolant temperature sensor was measured and compared with the standard value. Or use the decoding of the electronic control unit to detect and replace the faulty coolant temperature sensor.

3. The air flowmeter or intake pressure sensor should be tested, and its parameters should meet the standards.

4. Measure the idle fuel pressure of the engine. The value should be 250 kPa, and the fuel pressure is about 300 kPa when the throttle valve is fully open.

5. Connect a voltmeter or test lamp to the wire harness plug of the cold start injector, and check whether the working duration of the cold start injector meets the standard value when the engine is started.

6. If the engine fault sensor emits black smoke after unplugging the wiring harness plug of the oxygen sensor, it should be replaced.

7. Remove the fuel injectors and check whether each fuel injector leaks oil or is stuck. If there is any abnormality, clean or replace the fuel injector.