[s-cars] Too much boost

[Joe Pizzimenti]

Tom,
Did you try turning it down via a manual boost controller plumbed
inline with the WGFV?

http://pictureposter.audiworld.com/47312/manualboostctrl.jpg

Joe

On 8/9/05, Tom Mullane <tmullane at gmail.com> wrote:
> Keith,
> 
> Terrific.  That sounds like an easy fix ;-/
> 
> Marc suggested something along those lines.  Because the ECU, WGFV,
> and WG all check out, I was assuming that the ECU was setting boost at
> that level due to some faulty input.  Marc said that until we can
> watch the duty cycle at the WGFV we have no idea what the ECU is
> trying to do...or, more correctly, what the WGFV is receiving for a
> signal.
> 
> If the there is an output problem, it is either the ECU or the wiring
> to the WGFV.  I guess the best way to eliminate the wiring would be to
> run another set of wires directly to the WGFV from the ECU.
> 
> The other side of the coin is input.  What sort of faulty input, other
> than boost, could cause the ECU to demand so much boost?
> 
> At this point, I have returned the WG spring back to factory position.
>  Boost is still silly.
> 
> Tom
> 
> 
> > Tom,
> >
> > This sounds a lot like what I was seeing in the '93 S4.   I could
> > never EXACTLY trace down the source of the problem, but I'm pretty
> > sure I narrowed it down to the wiring to the WGFV.
> >
> > I tried all the stuff you did, swapping WGFV, etc etc.  The only way i
> > noticed the problem either being there or not being there was that
> > everytime it changed, it was right after unplugging/plugging the
> > wiring connector to the WGFV.
> >
> > I'm wondering if the right two wires short, the WGFV might get stuck
> > at full-closed.  Or something like that.
> >
> > At some point the problem went away, and I never saw it again (though
> > I was always careful to avoid fiddling with the wiring in that area!!)
> >
> > Cheers,
> > Keith
> >
> > --
> > ------
> > PGP Key: http://keith.maddock.com/pgpkey.html
> >
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