Cruze intake air flow is too large.

Too much intake air causes the mixture to be too lean.

1, which is generally caused by air leakage in the engine intake system.

2. The reason for the excessive intake flow of 2.Cruci is the throttle opening. The smaller the throttle opening, the greater the suction effect formed by the piston, the greater the suction force of the intake manifold and the greater the vacuum degree, that is, the smaller the intake pipe pressure.