$2.99 Oil Catch Can - Toyota Yaris Forums - Ultimate Yaris Enthusiast Site

06-21-2009, 12:20 AM

#11

eTiMaGo

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Drives: lil red 5-door

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Location: Bangkok, Thailand

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Quote:

Originally Posted by yaris-me

I'm confused. The hose from the PCV goes to the intake manifold after the throttle body and there is another hose that goes after the MAF. What is the point in having two? After throttle shut down wouldn't it just circulate air through the hose to the manifold?

vacuum sucks, simple as that. There is a difference in pressure on the ends of each hose, so the PCV system works as a kind of restricted bypass

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