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Loose PCV Nipple / Bushing
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Posted by 94 9000 CSE T (more from 94 9000 CSE T) on Sun, 3 Jun 2001 13:24:50 Share Post by Email
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Just noticed that the nipple/bushing [7b] is loose. I don't know whether it's always been this way or whether someone accidentally knocked it loose. Is this a problem? What is the consequence? Should I replace or ignore it?

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As I understand it from past posts, this whole PCV system is to allow crankcase gas to be released into the intake manifold so that it can be burned as fuel, and so that crankcase pressure doesn't build up and cause oil to be blown out through the oil seals and dipstick. The check valve [7a] is to prevent intake air from flowing into the crankcase *if and when* the pressure in the intake manifold is higher than in the crankcase, which I assume is during turbo boost.

But what is the purpose of the bigger hose [7c] leading to the air intake duct / turbo input? Is this to allow release of crankcase gas to the air intake duct when it can't go to the intake manifold? Why is it so much bigger? Does crankcase gas go there most of the time and at a higher flow rate, than to the intake manifold?

BTW, based on reading past posts, I now realize that [1] probably goes to the charcoal canister, and [4] goes to the Y connection which goes to the boost gauge and the celebrated hooter valve. But [2] is still a mystery to me. Brake servo? What on earth for? And is [5], which goes to "pressure sensor" (?) on the firewall, considered a vacuum line? I haven't seen [5] mentioned in the Quasi web site or other enumerations of the vacuum hoses.


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