[s-cars] Valve cover leak causing boost drop?

[Peter Golledge]

Firstly there is a one way valve which should avoid pressuring the 
crankcase, secondly the little bit of volume escape from there wont be 
noticeable.  Still a good thing to fix!

If you are leaning out check fuel pressure suspects (pump, filter, 
pressure regulator) you can check delivery by opening up the lines in 
the engine compartment and measuring the flow into a container.  The 
rate is documented in the bentley manuals, don't recall offhand what it 
is supposed to be.  For the rest you need a fuel pressure gauge, a cheap 
one from JC Witless has worked for me on many projects.

On 8/16/2012 9:22 PM, Jim Fleischer wrote:
> Definitely the half moon.....I dribbled a little water in the area and was able to pinpoint it.....put my finger on it specifically......thanks though.  I guess the question is whether this leak is enough to cause my boost issues?  It is something I need to deal with anyway, but still would like to know....
>
> Jim
>    ----- Original Message -----
>    From: Wylie Bean
>    To: Jim Fleischer ; s-car-list at audifans.com
>    Sent: Thursday, August 16, 2012 8:14 PM
>    Subject: Re: [s-cars] Valve cover leak causing boost drop?
>
>
>    Are you sure it's not leaking from the rubber 90 deree hose that goes into the back of the VC? Mine deteriorated and was leaking and hissing like that.
>
>    Wylie Bean
>    theringmeister at triad.rr.com
>    90 cq
>    91 90q20v
>    91 200q20v
>    92 urS4
>    08 Q7
>
>
>    -----Original message-----
>
>      From: Jim Fleischer <jim at almgt.com>
>      To: s-car-list at audifans.com
>      Sent: Thu, Aug 16, 2012 21:32:45 EDT
>      Subject: [s-cars] Valve cover leak causing boost drop?
>
>
>      Hi all,
>
>      I was just able to get a minute with the proper tools to pressure test for vacuum leaks......I've noticed a little oit leaking down the back of the engine before, but not enough to need to add any between oil changes.....I now can clearly hear air escaping past one of the half moons at the VC gasket under 10 lbs. of pressure......question is, is this enough to be causing my boost levels to drop and "lean out" at higher loads? All hoses are solid under that pressure.
>
>      Car has 140K on it, original gasket afaik. Thanks for any info!
>
>      Best regards,
>
>      Jim Fleischer
>      '95 s6 avant
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