Intake hose cracked because: The rubber Intake hose received a long period of high engine temperature and become fragile, generally this hose is linked throttle and air flow meter, speed up the engine will sway back and forth, so the hose to withstand the intensity of this swaying, long-term hardening of the hose coupled with the meeting of the shaking, the intake hose will be prone to cracking! Intake hose rupture: 1. The engine power is insufficient, the vehicle shaking, the engine fault light is lit. 2. The mixture ratio appears out of proportion, resulting in increased fuel consumption. The mixture is too thin or too thick, fuel combustion is not sufficient to produce a large amount of carbon deposits.