What is the metallic sound of Lexus ct200h cold start engine?

The reasons for the metallic sound of Lexus ct200h cold start engine in Pacific Auto Network are as follows: the belt of automobile accessory wheel is too loose, which leads to the increase of load when refueling the door and the abnormal sound of the belt; There is carbon deposit on the automobile throttle, the fuel inlet door is not smooth, and the idle speed control valve and throttle valve are too dirty; The intake air of automobile engine contains a mixture of carbon deposit and engine oil.

When the engine is rotating, if there is the sound of dry friction of metal parts outside, it is mostly the phenomenon that the bearings of generator, water pump and steering booster pump are damaged.

The cold car starts when the engine water temperature is low, and most of them have not started the car for a long time. For example, after parking at night, it will start the next morning. At this time, it is generally called cold start.

After the cold car is started, the on-board system will automatically enter a link called "cold car concentration". Simply put, it is to temporarily increase the concentration of fuel in the oil-gas mixture, so that the engine can enter the working state faster. At this time, the owner will find that the engine speed will be higher than the normal idle speed.

In winter, gasoline atomization conditions are poor, especially carburetor cars, which are difficult to start, and even after starting, they may not be able to turn into normal working conditions immediately. Of course, in winter maintenance, all oil and gas paths should be cleared, and the working conditions of throttle valve, choke valve, acceleration pump and vacuum pump should be checked and adjusted to the best condition. At the same time, the concentration of idle oil supply should be properly adjusted to ensure the normal rotation of idle speed in severe cold.

The abnormal starting sound of the cooling car has the following reasons: The belt of automobile accessory wheel is too loose, which leads to the increase of load and abnormal sound of the belt when the door is refueled. Carbon deposition on the throttle valve of the automobile leads to the blockage of the fuel filler door, and the idle speed control valve and throttle valve are too dirty. There is a mixture of carbon deposit and engine oil in the intake of automobile engine, which causes the valve to hum when it suddenly fills up. Solution:

1. Check the generator belt, compressor belt, booster pump belt, etc. If it is loose, please replace it or tighten it.

2. Check the accelerator of the car. If it is dirty, clean it and match it.

3. Clean the oil mixture and carbon deposit in the air inlet, and use special air inlet cleaner.

3. Check whether the accelerator pedal spring is loose or tired, and if so, replace it.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)