The throttle pipe is not firm.

The throttle is installed with cold water pipes, and the idle speed of the hot car is well controlled.

When the temperature of cooling water is low, the idle speed of automobile engine will be high, so understand the so-called high idle speed of automobile.

When the water temperature is high, the idle speed of the hot car engine is within the normal range.

But these two cars with idle throttle connecting pipes are old cars.

Cars are now electronic throttles, and there is no need to install water pipes to control the idle speed of cold cars and hot cars.