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What is the reason why the annual inspection of automobile exhaust is unqualified? It is no problem to do the annual inspection as I said.
2024-10-12
I once bought a second-hand Regal, which is very convenient to drive to work at ordinary times. I wanted to drive it all the time, but I encountered a problem during the annual inspection-the exhaust emission of the car was not up to standard, so I sent it to the repair shop and exchanged the accessories. That was painful and depressed! So, here comes today's question, about the annual inspection:Automobile exhaust detectionNot qualified? The old driver said it was the right thing to do.
1. (this one is required, others are optional.) Keep the car hot, even if you wait in line and idle, don't turn off the engine because you save a little fuel. Start the car when there are two or three cars in front of you before the test, and hit the throttle at high speed for a few minutes. (Generally, it will take 3-5 minutes. Don't be stingy with the oil at this time), and then test the exhaust emission.
The principle is: cold car detection line is the most unwise. The best working temperature of the three-way catalytic converter is 400 to 800 degrees, and it takes a long time from cold car to 400 degrees. (The detection point is a warm reminder to the note that NO exceeds the standard. When the temperature of the engine is too high, NO is easy to exceed the standard.)
Bang the throttle for a few minutes before testing, which can quickly reach the temperature of the three-way catalytic converterAbove 400 degrees, and can keep the heat for a period of time.
2. change the high-grade oil and pull the high speed (if it exceeds the standard slightly, you can not change the oil or add fuel additives and pull the high speed; the most appropriate method is to change the high-grade gasoline and add additives to pull the high speed)
High speed has a considerable effect on cleaning the oil circuit and cylinder of the engine. The reason is that when the engine is running at high speed, the fuel supply increases and the fuel flow rate also increases, which helps to wash out the dirt and impurities in the oil circuit to achieve the cleaning effect. Moreover, due to the high-speed movement of the piston, the temperature in the cylinder is higher, the flow rate and speed of the airflow in and out of the valve are also high, and the combustion will be more complete, which is conducive to removing the carbon deposits of the valve and making the blocked passage smooth.
If you dare not drive so fast, you can also stop in neutral and step on the accelerator (speed above 3000) for a period of time (more than ten minutes). The advantage of pulling the high speed is that when you run the high speed again in the future, there will be no more screams like before, and the acceleration will be smoother and more powerful.
Replace spark plugs 3. (As long as the electrode point is cleaned with sandpaper and the gap is adjusted, my own spark plug is replaced by the old one)
4. adjust the ignition time. This is very important. Due to the delay of the ignition time, the combustion time in the combustion chamber will be shortened, and the maximum combustion temperature will be reduced, which will reduce the exhaust hydrocarbons and nitrogen oxides, resulting in a decrease in engine power. When is the best time to adjust? Adjust to the limit, as long as you can run on the highway around the city, it can reach 200 km/h, because the adjustment is too late, the car can't run, and you can adjust it back after testing.
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