What's the performance of Cruze valve cover broken?

1, Cruze valve cover is damaged, resulting in unstable idle speed. When the engine is idling, read the data of the throttle position sensor, and the opening is 1%. Obviously, this data is not consistent with the speed, and the air should enter the engine from other ways.

2. Listen carefully, you can hear the sound of air leakage on 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 vent pipe, which is hissing and leaking air.