What is the impact of Toyota Velanda idling for two hours?

If the engine idles for a long time, the throttle opening will be very small, and the injector will spray high-concentration engine oil to ensure the engine running. Therefore, idling itself is more likely to cause carbon deposition than driving or running at high speed. If it is idling for a long time, the carbon deposition of the engine will definitely be more serious. Carbon deposition in the engine will directly affect the power and comfort of the car.

Idling for a long time, the concentration of engine mixture is too high, the oxygen content of exhaust gas is low, and the incomplete mixture burns at the position of three-way catalyst, which is easy to burn out the three-way catalyst.