What causes the low idle speed?

There are many reasons for the low idle speed of the engine, such as problems with the idle speed regulating valve, carbon deposition on the throttle, carbon deposition on the valve, air intake blockage, air filter blockage and insufficient injection pressure. The idle speed of the engine is regulated by the throttle. When the engine is idling, the throttle will keep a small opening and the throttle will be idling.

If there is carbon deposit in the throttle or air intake, it will affect the low air intake, the low idle speed of the engine and even the easy flameout.

Some cars use idle valves to adjust the amount of air entering the engine at idle speed. If there is something wrong with the idle valve, it will also affect the low or unstable idle speed of the car. The solution is to replace the idle valve.

When the carbon deposition on the engine valve is serious, it will affect the lack of air entering the engine and the phenomenon of low idle speed will appear. And the air or mixed gas entering the engine will cause the necessary vortex, so that the air and gasoline can be fully mixed. If the valve carbon deposit is serious, it will cause the mixture or air to form a vortex, which will affect the insufficient combustion, so the idle speed will also decrease.

Some in-cylinder direct injection engines, air inlets and valves are very easy to cause carbon deposition. It is recommended that such engines be thoroughly cleaned every 20,000 kilometers. A very good method to remove carbon deposits is walnut sand removal.

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