[s-cars] Cold Stumble - Fuel cutoff?

[Mark Strangways]

Ignition switch ?

Dunno...

Mark
----- Original Message ----- 
From: "James Shackelford" <93UrS4 at rovershack.com>
To: <s-car-list at audifans.com>
Sent: Thursday, December 02, 2004 2:43 PM
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
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
>