Idle speed of the car. Elantra 1.6L manual transmission stopped at the same place and idling normally for 800 rpm?

This is a common problem. When the car is in use, the fuel vapor at the accelerator is caked and dirty. In order to ensure the scheduled idle speed of 800 rpm, the engine computer will control the idle motor of the idle auxiliary airway to start at a certain angle, and constantly correct and remember this predetermined angle. When you put in neutral to collect oil, the idle speed will not drop immediately because of the opening of this predetermined angle. Troubleshooting: After cleaning the throttle and idle motor, remove the negative electrode of the battery for more than one minute and clear the computer learning value.