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คำตอบที่ 53
เรื่องของ PCV เรื่องเดียวก็ก่อปัญหาได้แล้ว
When the engine is running, intake manifold vacuum is supplied to the PCV valve. This vacuum moves air through the clean air hose into the rocker arm cover. From this location, air flows through cylinder head openings into the crankcase where it mixes with blow-by gases that escape from the combustion chamber past the piston rings. The mixture of blow-by gases and air flows up through cylinder head openings to the rocker arm cover and PCV valve.
Intake manifold vacuum moves the blow-by gas mixture through the PCV valve into the intake manifold. The blow-by gases are then moved through the intake valves into the combustion chambers where they are burned. Since blow-by gases contain hydrocarbons and other pollutants, these gases must not be allowed to escape to the atmosphere.
*** The PCV system prevents the escape of blow-by gases to the atmosphere. On many engines, the PCV system delivers blow-by gases to one location in the intake manifold. This type of system may not deliver these gases equally to all the cylinders. ****
**** This action may result in an air-fuel ratio variation between the cylinders, which results in rougher idle operation. ****
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