( NEW ) PCV Valves not working ?
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Intermediate
Joined: Nov 2018
Posts: 25
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( NEW ) PCV Valves not working ?
Dear fans, as asked in the previous post, to my knowledge, the PCV valves don't work on older models. Unfortunately, the PCV valve, just like the new ones I ordered, has no function after installation other than acting as a hose. If you suck into the removed valve from the intake side while the valve opening (engine side) is facing upwards, it closes. However, this is the wrong direction, and of course, it's not installed that way. If the valve opening points downwards, as it does when installed, no valve function can be reproduced. The new valve hoses on the right and left are no different from the ones previously installed. Could this be a design flaw by GM, since the valves were changed later? It's a Stingray Z51, which still has the two PCV valve hoses on the right and left. The hoses are simply clipped in and can be removed in seconds for testing. Perhaps the experts here on the US forum can answer this question.
Last edited by meikel24; May 14, 2026 at 04:10 PM.
