[s-cars] Low Boost History

[Brian Armstead]

Bob,

Attached are a couple of the many pix I took at the show.  I'll send
more next week.  I'm pretty sick today and am heading home.

Brian

Robert Myers wrote:
> 
> This is a resend.  The first attempt at posting appears not to have
> been processed.
> ______
> 
> Hi again Y'all,
> 
> A while back my RS2ed urS6 lost boost.  Instead of maxing out at
> something like 27-28 psig it began to max out at 13-14 psig.  The
> engine otherwise ran perfectly.  No misses.  No stutters.  Smooth as
> silk.  Just not as much power as I was used to.
> 
> Since then the following has been done (not necessarily in this order):
> 1.      System pressurized - it holds pressure - no leaks of any significance.
> 2.      Pulled WGFV.  Cleaned it with carb cleaner and sprayed
> innards with kroil.  Reinstalled and boost was back to normal for
> about 5 minutes.  Then it dropped like a rock in the middle of a high
> boost run and has not returned since then.  New WGFV is on order
> (hasn't arrived yet).
> 3.      At this same time I pulled the lower WG hose from the WGFV
> plugged opening to WGFV to prevent an air leak and went for a
> run.  Still low boost.
> 4.      Later a stumble under boost developed.  I pulled the coil
> pack.  Plug boots showed signs of possible problems.  Two were brown
> rather than black.  I installed a spare set - used but good
> condition.  Stumble gone - good.  Boost still gone - bad.  Retorqued
> plugs.  They were not loose.
> 5.      Forge BPV pulled, cleaned, reinstalled.  No change.  Stiffer
> spring ordered (back ordered).
> 6.      OXS replaced (Bosch 13913).  Old one looked like it was
> probably the original one and was snow white and due for
> replacement.  No change.
> 7.      ECU pulled and replaced with a spare - no change.
> 
> OK, what have I overlooked?
> 
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