Do it at your own risk!
PCV valve(Positive Crankcase Ventilation valve)，不是PVC(Polyvinyl chloride -
PCV valve，我有一个最简单粗略形象的解释：如果你知道早期的高压锅，那PCV valve就是高压锅上的减压保险阀，高压锅代表发动机。
PCV如果堵塞，导致发动机内压力升高，engine oil 寻求薄弱部位突破，是引起valve cover gasket leak的原因之一。
As an engine operates, high-pressure gases are contained within the combustion chamber and prevented from passing into the crankcase (containing the crankshaft and other parts) between the side of the piston and the cylinder bore by piston rings which seal against the cylinder. However, some amount of gas always leaks past the piston rings into the crankcase. This amount is very small in a new or properly rebuilt engine, provided that the piston rings and cylinder walls are correctly "broken in", and increases as the engine wears. Scratches on the cylinder walls or piston rings, such as those caused by foreign objects entering the engine, can cause large amounts of leakage. This leaked gas is known as blow-by because the pressure within the cylinders blows it by the piston rings. If this blow-by gas could not escape then pressure would build up within the crankcase.
Before the invention of crankcase ventilation in 1928, the engine oil seals were designed to withstand this pressure, oil leaking to the road surface was accepted, and the dipstick was screwed in. The hydrocarbon rich gas would then diffuse through the oil in the seals into the atmosphere. Subsequently, it became an emissions requirement as well as a functional necessity that the crankcase have a ventilation system. This must maintain the crankcase at slightly less than atmospheric pressure and recycle the blow-by gas back into the engine intake. However, due to the constant circulation of the oil within the engine, along with the high speed movement of the crankshaft, an oil mist is also passed through the PCV system and into the intake. The oil is then either burned during combustion, or settles along the intake tract, causing a gradual build-up of residue inside the inlet path. For this reason many engine tuners choose to replace the PCV system with an oil catch can and breather filter which vents the blow-by gases directly to atmosphere and retains the oil in a small tank (or returns it to the sump), although this technically fails to meet most engine emission legislation.
图正中间那个白色的冬冬 --- PCV valve
Throttle 和intake. PCV就在后边。
这一侧看过去。已经拔出来的PCV从intake 之间暴露出来。沿着两根管子，很容易找到与intake 的连接。同样拔出来。
液体二氧化碳dust cleaner，也是居家DIY很常用的工具。pop dent也用得着，只不过我的dent不太好搞。