[s-cars] Re: [Audi5zylinderturbotechnik] Possible ignition problem

[Russ Panneton]

Rod,

I read the other responses off the s-car list and they all sound reasonable.
My 95.5 S6 developed a symptom very similar to what you describe about a year
ago.  It only occurred at light to trailing throttle or deceleration.  I
forget the code but the ECU complained about an intermittent "control limit
not reached."  I suspected the O2 sensor even though it was only a year old
because I replaced it with the cheap "generic" Bosch part instead of the
expensive Audi part with the correct connectors.  Sometimes the check engine
would come on but it went back off the instant I gave the car some more
throttle.  The Bentley suggests all the regular suspects for the code but also
includes the PSO as possible culprit.

Anyway, just a week ago my car suddenly developed an intermittent consistent
miss.  That sounds like an oxymoron but sometimes the car ran fine -- full
boost, idle, anything.  Other times it missed at idle, full boost, anything.
I replaced the PSO for the affected cylinder and not only did the miss go
away, so did the mysterious light throttle stumble.  Coincidence?  Time will
tell.  I can tell you that the car runs better than before and the idle is
better (less hunting) with the new PSO.  The difference in feel leads me to
suspect the PSO is more than just a simple driver stage for the ignition coils
or that they can "fade away" in addition to just out right failing.

HTH,

Russ

On Sun, 1 Dec 2002 20:38:13 EST, s4audinut at aol.com wrote:

>Greetings from the Andoulette capital of Amerika.
>My car is running really well but I am having a slight problem at steady
>state or decellerating.
>What are the symptoms of POS failure? This problem seems intermittent and
>only appears when the car is running no boost, on boost perf. is fine. Car
>seems to cut out or lose fire only at times, give it gas and it pulls like
>crazy. I never kept up with the POS discussions anyone recognize what I
>describe? This problem doesnt seem to affect perf. at all and is only an
>aggravation which I want to get gone.
>Rod
>
>
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--
Russ Panneton                          russ at s-cars.org
Nederland, CO              "Too bad ignorance isn't painful"