What's the buzz when idling?

Idle engine is noisy, and the car feels trembling because the engine is not working smoothly.

The solution is that the accelerator sensor device of automobile engine needs cleaning, which can solve the problem of high noise of automobile engine. Jitter is caused by engine deflagration, and piston carbon deposition can also cause this phenomenon. Check the fault code, and if there is no fault code, check the exhaust system.

During engine starting, the starting motor should not have harsh sound; The engine idle "chug sound" is even and there is no abnormal sound; The idle speed is stable at about 850 rpm (please refer to the automobile manual for specific stable idle speed values).

Extended data:

Engine idle noise is generated as follows:

In the air intake system of the vehicle, observe whether the air filter is too dirty and whether the vacuum tube is aging and leaking. By cleaning the throttle valve, avoid affecting the air intake. Check the exhaust system of the vehicle, check whether the three-way catalyst is blocked, and clean or replace it in time.

Check whether the engine oil with different grades is used. If you add too much oil, the engine will be dull. There is no problem with these two kinds of noises, and they don't need maintenance. If the abnormal noise is caused by carbon deposition, the owner will go to the 4S shop for cleaning and maintenance.

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