[s-cars] Missing once more

[Robert Myers]

No error codes except for an occasional OXS out of adaption limit which 
happens only when coasting down hill with a VERY light touch on the throttle.

At 04:19 PM 6/28/2005, Tom Green wrote:

>DTCs??   Are you dropping any codes with this problem, Bob ?
>With intermittent codes, you may have to read them before too
>many shutdowns and restarts or they may disappear, but if it is
>low fuel pressure, I would expect a whole bunch of codes for
>emissions not in the controllable range, and perhaps the same
>with any boost leak.   The coils and PSO's, as we know, may fail
>without any such notice.
>
>I'm only about 300 miles "as the crow flies"  but it doesn't sound
>like the wonderwagen is flying right now and it's maybe 500 miles
>by usable roads.
>
>Tom '95 S6 in Knoxville
>
>
>>Bob Myers wrote:
>>This is driving me nuts.  Yeah, I know - sho”\ÃwØþø rt trip.  :-(
>>
>>Miss Piggy (RS2ed '95 urS6) has developed another miss.  I have experienced
>>several failed PSOs and coils.  This miss appears to be neither.  It feels
>>almost like some sort of a flutter.  The change in (Stromung) exhaust note
>>is significant.  "Brap-rap-rap-rap-rap-rap-rap...".  The "miss" shows up
>>only when boost levels exceed 18 psig.  The engine runs perfectly until
>>boost hits 18 psig.
>>
>>This morning I ran a couple of errands and on the first jaunt the miss
>>somehow seemed to heal itself without any apparent cause.  (I hate it when
>>that happens.)  After shutting the engine down and taking care of some
>>brief business I fired Miss Piggy up again and the miss is back.  So much
>>for the miracle cure.  :-(
>>
>>"Repairs" done:
>>1.    replaced plugs and boots (it was about time for that anyway).
>>
>>
>>Diagnostics performed:
>>1.    attempted to localize miss to one cylinder - failed.  There seems 
>>to be
>>no difference between coils and behavior when injectors are disabled one at
>>a time.
>>2.    spark intensities appear to be consistent from one cylinder to another.
>>3.    swapped in a known good ECU - no change.
>>4.    swapped in newly burnt chips - no change (either expected or observed).
>>5.    Swapped BPV with another BPV.  No change.
>>
>>Suggestions anyone?
>>
>>Bob
>
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