So, the positive crankcase ventilation (PCV) system, is nothing new and has been around forever.
Primarily, it was developed, to reduce emissions. But, today, it actually does a lot more.
The (PCV) system is simple. Consequently, the most important part, of this whole system is, the (PCV) valve.
Like all automotive systems, it must be, monitored and maintained, to function as designed.
A restricted or clogged (PCV) system, a common problem; is usually due to, an engine problem or the lack of proper maintenance.
So, while doing it’s job of, controlling crankcase emission, it also has other jobs:
- Slows down carbon build-up in the intake manifold.
- Removes condensation from the oil.
- Acts as a flame arrester to prevent backfires.
- Stops pressure buildup, that leads to seal blowouts and oil leaks.
- Above all, the reduction of, engine oil sludge.
So, as you can see, the (PCV) system is, more important than you would think. Consequently, it does all this by using, manifold vacuum to draw vapors, from the crankcase, into the intake manifold.
And, it’s the (PCV) valve that regulates, when and how much vacuum, to pull through the crankcase. Finally, at some point, they’re pumped back into the cylinders, for another shot at combustion.
So, the blow-by gases, should only be recycled when; the car is traveling at, slow speeds or idling.
But, when the engine speeds up, the air pressure in the intake manifold, increases.
As a result, the suction slows down; reducing the amount of blow-by gas, recycled to the cylinders.
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