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What is a pcv valve? Car mechanics?

What is a pcv valve? Car mechanics?

Answer:

PCV valves don't really affect the way a car runs. Unless you leave the hose to it open, creating a massive vacuum leak. They're to keep acidic gases from building up in your crankcase. Without it, you would need to change your oil a lot more often. Before about 1965 or so, cars had what's called a road draft tube, which through a venturi effect, drew out these vapors. Some sort of crankcase ventilation has been used pretty much as long as there have been cars. Many newer vehicles don't actually use a valve, but a calibrated orifice instead.
PCV Positive CrankCase Ventilation, its designed to vent out the gases that leak past the piston into the crankcase. The valve is more for pollution reduction as the vented gases are recirculated back in for combustion, So you don't need it but its nice to keep the air clean,
Yes the car would run but run very bad.. The pcv valve stands for positive crankcase ventilation If bad or missing you will have a very, very bad vacuum leak.. simple to replace change it cost is chep enough for a chance....
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positive crankcase ventilation. allows blow-by(unburn air fuel) gas to circulate back to engine to burn remove and shake it, it should rattle, if not , try to clean it first then rattle it. if no rattle sound, replace it.

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