[s-cars] Uh-oh!

[Achint Sandhu]

Hi Bob,

    The 10PSI of boost cut out is the ECU lowering the max boost because
it has sensed something wrong with the system. This limit will stay
enforced regardless of other conditions until the car has been
restarted. You may want to check codes to see what is going on. On my 96
S6 I sometimes get a "manifold pressure exceeded" code to indicate what
is happening. I am told that on older cars this code does not survive a
restart. I'm not sure what the case is with the 95.

    On the 94 S4 I used to own, I had a similar problem on a completely
stock car. It eventually turned out to be the fuel pump that was on it's
last legs. I would suggest that you check the main components of your
fuel system to make sure that they are working properly. Checking to see
if the mixture is leaning out under high boost would be a good first
check. Any number of A/F ratio gauges attached to the O2 sensor should
be able to provide this information.

    Hope this helps.

Cheers,
Achint

Robert Myers wrote:

>Hi Y'all,
>
>While passing a school bus on the highway this afternoon I experienced what
>felt like an overboost fuel cut-out in my '95 S6.  The boost at that moment
>was not high enough to cause this.  I repeated the "experiment" several
>more times and found that the cut-out repeatably happened at approximately
>10 psig of boost.  This is quite a bit below where such an event should
>happen in this car.  When boost was below this 10 psig point the car
>appeared to run perfectly normally.
>
>After a brief stop during which time the ignition was turned off for a
>couple of minutes on the trip back home I tried several times (as road and
>weather conditions would permit) to see if the cut-out would repeat.  It
>did not - even at boost levels over 18 psig,
>
>Has anyone else experienced this?  If so, any idea of the cause?  A
>momentary computer glitch which should be ignored?  Or a major problem with
>this or that sub-system?  Ideas?
>
>Bob
>*****
>  Robert L. Myers   304-574-2372
>  Rt. 4, Box 57,  Fayetteville, WV 25840 USA   WV tag Q SHIP
>  '95 urS6  Cashmere Grey - der Wunderwagen    ICQ 22170244
>  http://www.cob-net.org/church/pvcob.htm
>*****
>
>
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