[s-cars] code 2224 (Over boost condition)

[Jack Gagnon]

Good Idea,

I will try swapping with my wife's car (stock 92 S4).

It is quite handy having two!

Jack

-----Original Message-----
From: s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com] On Behalf Of Joseph Pizzimenti
Sent: Friday, August 16, 2002 9:31 AM
To: Jack Gagnon; S-Car-List
Subject: Re: [s-cars] code 2224 (Over boost condition)

Did you try replacing the TAP wg spring with a stock
one?
--- Jack Gagnon <bullitt at cybertours.com> wrote:
> Hello,
>
> I have a problem in my 92 S4.  The car has a hybrid
> KKK small 26/Air
> Research T04 turbo that was on the car when I bought
> it about a year and
> half ago. When driven hard, I get a sudden fuel or
> boost cut-out that sends
> the car into a low boost mode until restarted.
>
> I attributed my problems to the TAP chips that
> triggered an ECU code of 1111
> (ECU malfunction or invalid checksum).
>
> About 4 months ago I purchase a Lehmann stage III
> chipset to replace the TAP
> and the code 1111 went away.  I then started to see
> another code 2222 (ECU
> Pressure sensor defective) so I replaced the TAP
> 3.1? bar sensor with a
> Bosch 3 bar and things are getting better.  The
> wastegate frequency valve is
> finally working to control the boost.  Prior to
> replacing the ECU pressure
> sensor boost was only available by manually
> adjusting the spring pressure to
> the desired boost level (not good practice!).
>
> Now it appears that the wastegate frequency valve is
> having trouble
> controlling boost evidenced by code 2224 (Over boost
> condition).  I am not
> sure what to do next.  The frequency valve is
> functioning properly most of
> the time, but does exhibit some strange behavior.
> Under tall gear long full
> throttle applications, the boost gauge needle
> flutters (enough so I can hear
> it).  There is no fluttering while rowing through
> the gears.  The fluttering
> appears to be the frequency valve not being able to
> keep up with the turbo
> resulting in high and low boost cycling.  Another
> symptom is a cut out at
> about 6300 rpms in 3rd.  The cut out disrupts the
> acceleration abruptly and
> sends the car into a low boost limp mode.  I have
> had this happen
> immediately a few times when making a really hard
> shift from 2nd to 3rd.
>
> Should I replace the frequency valve?
> Can it be cleaned and lubed?
> Is the turbo just to big for the stock controller?
> Do I need an aftermarket controller?
>
> Thanks
>
> Jack
>
> Overboosting and Limping in K-port, ME
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