[s-cars] List advice needed

[Bruce Mendel]

It's likely the power output stage (POS, aptly named) on the firewall behind
the black plastic cover, assuming the cover is still there.

There are two of them. Each one controls 3 cylinders, so one of them has an
open channel. You can swap fuel injector leads at idle until when you change
one, it does NOT affect the idle. Then you will know you found the cylinder
causing the problem (assuming it's stuttering when you start the procedure).

Then either use your mad soldering skillz to bypass the bad channel to the
unused one, or buy a new POS and swap it out...takes five minutes at most.

Bruce
----- Original Message ----- 
From: <Realcoast at aol.com>
To: <s-car-list at audifans.com>
Sent: Friday, September 28, 2007 2:38 PM
Subject: [s-cars] List advice needed


> 93 S4
> Problem :
> Studdering type miss, when cold or warm
> up to usually 3000 + rpm but not always goes away.
> The symptom can disappear entirely for 30 + km at any time.
> Began immediately after changing fuel pump and filling tank to check the
> seal.
> I have run water remover thru and changed filter and plugs to no  avail.
> Best guess- electrical ?
> Any input much appreciated.
> Dave H.
>
>
>
>
>
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