[s-cars] Boost leak is back

[JR]

Ok I built the boost tester with the cleanout cap and stuff.  When I 
pressurize the system, should it hold the pressure?  The only place I 
can hear air leaking out is what appears to be a small vent on the back 
of the engine below the two breather hoses that connect back there near 
the top on the right (passengers side) side of the engine.  The vent is 
covered by a gray rubber gasket/valve.  Air audibly seeps out of this 
rubber piece.  Is this normal?

JR


JR wrote:

> Ok so I had the car boost leak free for a few weeks and now it's 
> leaking again.  The car does make boost but not like it has been.  It 
> seems like the turbo whoosh and whistle noise is louder than it should 
> be too.  I checked at the moisture trap and the ecu.  I've had that 
> failure before and it doesn't feel like that.  That was even less 
> boost that I'm making now and the car really bucked at higher RPMs.  
> This is smooth boost making a lot of whistling and whooshing but 
> cutting out at higher RPMs, but not bucking and jerking.  It feels 
> like a cracked hose that has a hole that opens under high boost and 
> closes when the pressure lets off.  I checked all 3 Samcos and they're 
> on tight.  The car has about 100K so all other hoses are probably not 
> in that great of shape.  Where are the common points of boost failure 
> besides the 3 Samcos?  By 3 Samcos I mean intercooler to crossover 
> pipe (Michelin man), the turbo to crossover pipe and bypass valve, and 
> the top of intercooler to intake manifold.  I have the tester built to 
> pressurize the system and listen for leaks, but have to go out of town 
> right now so I can't do it.  Any hints as to where the common leaks 
> are would be great.
>
> Thanks,
>
> JR
>
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