What are the manifestations of Cruze valve cover fracture?

The damage of the Cruze valve cover is as follows: 1. Cruze valve cover damage leads to unstable idle speed. When the engine is idling, the throttle position sensor shows that the opening is 1%, which is inconsistent with the speed, and air enters the engine from other ways. 2. You can hear the sound of air leakage from the valve cover. Upon further inspection, it will be found that there are two vent holes on the valve cover, corresponding to the position of the crankcase ventilation pipe, which is a "hissing, hissing" air leakage sound. Precautions for replacing the valve cover are as follows: 1. When replacing, thoroughly clean the contact surface. Stick as long as you can, because it will stick for a long time, and it can be done without sticking, depending on the owner's wishes; 2. The engine must be completely cooled before it can be replaced; 3. When installing the valve cover, tighten it diagonally several times. After fixing the screw, fix the screw at its opposite corner. This can prevent uneven stress on the valve cover gasket.