Is it normal for the car to idle at 800 rpm now?

It is normal for a car to idle for 600 revolutions. The following are the reasons for the low idle speed: 1, the throttle is too dirty and needs cleaning. 2. If the idle speed control valve fails, it needs to be replaced. 3. Too much carbon deposit in the cylinder is a common phenomenon, which needs to be cleaned up. 4. The fuel injector is poorly atomized or blocked. First, clean the fuel injectors. If not, only the fuel injector can be replaced. 5. There are impurities in the oil circuit, so you can't go to an informal gas station to refuel inferior gasoline with many impurities and water. 6. The solution to the viscosity change of engine oil should be replaced by suitable engine oil, which can be explained clearly by referring to the vehicle instruction manual.