What is the cause of the leak at the throttle inlet?

Cause of air leakage behind the throttle valve of Pacific Auto Network: 1, and the ventilation valve of the fuel tank is normally open; 2. The intake manifold is cracked; 3. The throttle gasket is damaged; 4.DME seal has a problem; 5. There is a problem with crankcase ventilation; 6. The engine body leaks air.

There is a leak in the air intake system, which causes the engine control unit to light the EPC warning light after detecting the problem. This situation can also be extended to the situation when the engine is started. Do not pull out the fuel gauge or open the fuel filler cap. The engine controller will misjudge the air leakage at the engine air inlet, and at the same time, it will also cause a fault, which will lead to the EPC light being on and the engine shaking. If there is a leak in the crankcase ventilation system, this fault may also be caused.

The secondary air inlet "refuels" the throttle. On the one hand, the secondary air intake is for environmental reasons, and the evaporated engine oil will be discharged into the throttle through the air duct to participate in combustion again. On the other hand, the evaporated engine oil is pumped out of the crankcase through the negative pressure of the air inlet to reduce the crankcase pressure. There is a ventilation pipe from the engine crankcase to the throttle. When the engine is hot, the oil evaporates, and the oil and gas enter the throttle through the ventilation pipe. Part of the oil and gas will condense on the throttle valve, resulting in carbon deposition.