It's the PCV ( positive crank ventilation ) valve nothing to do with boost pressure control
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Yep - that PCV valve opens when crankcase pressure exceeds a certain (unknown) value so as to vent fumes back to intake system.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
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are u pressurizing from MAF hose? PCVvalve will leak air as it is eventually linked into that hose via a connection in the cam cover.Volcano ABY coupe
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I'm going to watch this thread closely, as I seem to be having the same problems. runs very well if I'm not at WOT. Once I floor it though and boost starts to build, I get a jarring case of the hiccups from about 3000 to 4000 RPMs. Only happens when engine is close to or at 90C. Before that, smooth as silk.Ben
Calgary, Alberta
Canada
1991 CQ e//S2 w/ RS2 spec 3B 20vt
Panther Black Metallic
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