[s-cars] Need Diagnostic Help

[Joseph Pizzimenti]

Bob,
Could be anything from a boost leak to a bad chipset. 
I had the same problem with my car when I first got it
and it had a TAP SII in it.  Remove WG spring and
compare with your own to see if it's stock or not. 
Pressure test for boost leaks.  Or, if ya wanna be
real cool, test the pressure transducer to see if it's
outputting the proper voltage.

Did he just buy this car or has he had it a while?

Joe

--- Bob Rossato <bob.rossato at att.net> wrote:
> Hello fellow S-heads,
> 
> A friend of mine is having some intermittent cutoff
> problems on his S4.
> It happens during wide open throttle.  He states
> that it is not like a
> misfire, it's more like a hard cutoff such as
> hitting the rev limiter,
> though he's nowhere near the rev limit.  Has
> happened a handful of times
> over the last few weeks.  When it's not acting up it
> pulls strongly, so
> I wouldn't suspect the usual ECU boost line coming
> off as it wouldn't
> reseal it self.  And besides, he's adamant that it's
> not just a loss of
> boost, it's a complete loss of power.  Again, only
> during WOT.  Ease off
> on the throttle and the engine comes back.  I also
> wouldn't suspect the
> POS or coils as I would expect that to be more of a
> misfire, not a
> complete loss of power.  
> 
> We checked the codes today and got the following 3
> codes:
> 
> 00519 - Intake Manifold Pressure Sensor (G71)
>             06-10 - Signal to High - Intermittent
> 00561 - Mixture Adaptation
>             14-00 - Adaptation Limit (Add) Exceeded
> 00544 - Maximum Boost Pressure Exceeded
>             27-10 - Implausible Signal -
> Intermittent
> 
> The 00561 mixture adaptation I've seen before on my
> car and others but
> I've never noticed anything wrong performance wise
> so I don't think
> that's the first thing I'd chase down.  The 00519 &
> 00544 are more
> relevant I think.  Is this an indication of a
> problem with the WGFV?  We
> will be checking the line to the ECU and water trap,
> as well as boost
> hoses anyway just to make sure.  Any other thoughts?
> 
> 
> The car is a '94 S4 with ~53k miles.  Completely
> stock.  And let's see,
> what else... oh yeah, it's Pearl White if that
> helps.
> 
> Bob
> 
> 
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