[s-cars] Stumbling at low rpm

[Kirby Smith]

I believe a head or block mounted temperature sensor is used by the
control system to know when the engine is cold and needs a richer
mixture.  Perhaps your's has failed.

You drive below 3000 rpm?  :-)

kirby

Vincent Frégeac wrote:
>
> Hi all,
>
> My S6 developed a strange behaviour. It stumbles between 1500 and 2000
> rpm but only in 2nd gear. In fact, it may have the same behaviour in
> higher gear but the 2nd gear is the only one I go below 2K rpm. 1st gear
> is correct whatever the rpm and 2nd gear and higher are correct passed
> 2K rpm. Stumbling is more pronounced under hard acceleration and also
> disappears if I release the gas pedal and accelerate again. And last,
> everything goes well when the engine is fully warmed up, after half an
> hour or so. Idling is rock stable with some slight misses and I also
> have a slight vibration at any rpm, only noticeable when you know the
> car which used to be really smooth a few weeks before. BTW, no codes.
>
> Recent work done: Generic O2 sensor, New F5DPOR, all under hood
> electrical connections checked and cleaned. All this only lowered the
> rpm where stumbling disappears from 2.8K rpm to 2K rpm.
>
> Any idea?
>
> Vincent
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.427 / Virus Database: 240 - Release Date: 06/12/2002
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list