[s-cars] Cold Stumble - Fuel cutoff?

[tony.curran at sympatico.ca]

Have you changed the fuel filter?

Tony
96 S6

> 
> From: "James Shackelford" <93UrS4 at rovershack.com>
> Date: 2004/12/02 Thu PM 02:43:12 EST
> To: <s-car-list at audifans.com>
> Subject: [s-cars] Cold Stumble - Fuel cutoff?
> 
> I still don't know what is causing my issue.  I just drove home from DIA
> today, and it was bad for most of the drive, the new thermostat that I
> installed while doing the T-belt is a little colder than the old one.
> Though, after reading all the post I have some other input.
> 
> My issue does NOT occur at idle even when 10 degrees like it was today.  It
> idles fine with no issues.
> It doesn't do it at high boost or in the summer.
> It feels worse between 1500 and 3000 RPM.
> It did it today at highway speeds in fourth gear above 4000 RPM.
> It is a total %100 loss of power, almost like the fuel is being cut off.
> It doesn't jerk the car as extremely over 4K RPM, probably because the
> engine is moving fast enough not to jerk.
> I REALLY am starting to think some fueling issue.  To loose all power for
> 1/2 of a second doesn't indicate 1 or 2 cylinders not firing.
> It seems very much like a total loss of all spark, or a total loss of all
> fuel.  It has to be one of those two.
> 
> Spark?
> POS are tested good.
> All coils bad, highly unlikely.
> New plugs and boots.
> 
> Fuel?
> Need to test voltage at fuel pump.
> Fuel pressure regulator?
> Will run a thankful of BG44 and see what that does.
> 
> Still looking,
> 
> James Shackelford
> 
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