Fw: [s-cars] Need Diagnostic Help

[Mark Strangways]

> I had a very similar problem, the spark was jumping across a slit in the
> wire during high boost conditions.
> And ONLY high boost conditions.
> 
> My first stop now is to always check the plugs and wires.
> 
> Mark S
> ----- Original Message ----- 
> From: "chris chambers" <fastscirocco_2000 at yahoo.com>
> To: "Bob Rossato" <bob.rossato at att.net>; "S-Car-List"
> <s-car-list at audifans.com>
> Sent: Friday, December 12, 2003 5:10 PM
> Subject: Re: [s-cars] Need Diagnostic Help
> 
> 
> > Bob,
> >
> > I had this exact same problem...I called it the bucking S4.
> > What was happening with mine is that the ecu thought I was hitting
> > overboost and cut off the fuel pump.
> >
> > After doing alot of searching (and replacing plugs, oxy sensor, etc.) I
> > discovered this write up on SJM's site:
> >
> > http://www.sjmautotechnik.com/20vboost.html
> >
> > Basicly if you have the same problem I had either there is a bad maf or
> > if you are like me dirty contacts on the MAF. I cleaned my contacts
> > with electrical contact cleaner and haven't had a problem in over 5
> > months now.
> >
> > HTH
> >
> > Chris
> >
> >
> >
> >
> > --- 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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> >
> >
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