What is the reason for the high idle speed of Haval H6 19 and how to solve it?

19 Haval H6 automatic transmission has now run more than 7,000 kilometers. When it was started with one key, the idle speed immediately changed from 1200 to the normal level of 800 rpm. It is found that it takes about 30 seconds to return to 800 rpm when starting, and this problem was not discovered until 7000 kilometers ago. Excuse me, experts, is it hot these days? 19 Haval H6 (view transaction price | model details) The automatic transmission has now run more than 7,000 kilometers. When it was started with one key, the idle speed immediately changed from 1200 to the normal level of 800 rpm. These two days, I found that it takes about 30 seconds to return to 800 rpm when starting. This problem was not found before 7000km. There are many reasons for the high idle speed of the car, but we should know that the ignition, intake and nozzle of the engine determine the combustion of fuel and are also the power source of the engine. If the idle speed is high, then we should focus on the ignition, air intake and nozzle of the engine. The common reasons for the high idle speed of automobiles include the stuck throttle and lax closing, the failure of idle speed control valve, the failure of water temperature sensor, air leakage in the air intake system, and the failure of air conditioning switch and power steering gear pressure switch. It may be that the fluidity of engine oil is poor, so it may lead to untimely lubrication at the moment of starting, leading to dry grinding. If the abnormal noise of the hot car disappears, it proves that the problem is not serious. In addition, it is recommended that you properly clean the engine and throttle carbon deposit. @20 19