[s-cars] Stumbling saga, update......

[Jerry Scott]

This sure sounds like a coil breaking down at high boost.  Did you do the 
spark gap test on each coil, then replace the weakest coil?  This would be 
my next approach. The plug boots could be the problem and that is an easy 
fix.  Those should be replaced at 100k miles anyway.
Jerry
----- Original Message ----- 
From: "Jim Fleischer" <jim at almgt.com>
To: <s-car-list at audifans.com>
Sent: Thursday, December 03, 2009 1:24 PM
Subject: [s-cars] Stumbling saga, update......


> Hey guys,
>
> OK, so I put in fresh NGK BKR7EIX plugs this morning, and things greatly 
> improved, however still not right.  Whereas the car is definitely much 
> more driveable now, it still cuts out at high boost.  No more stumble at 
> lower revs under load, and the stumbles are fewer and shorter, but still 
> there at high boost particularly between 3K-4K RPM in third and fourth 
> gear (haven't had the road to get it in fifth under boost yet.)
>
> Unplugged the injectors again and the car is just not driveable with any 
> of the injectors unplugged.  The miss is quite apparent, and different 
> from what I normally experience.
>
> Also tried unplugging the MAF sensor, and the car is jerky and undriveable 
> until the revs come up, even then "limping" for sure.
>
> I did not replace the spark plug boots, as I wanted to see if the plugs 
> made the difference.  Is this the next step?
>
> I now defer to the list and it's infinite wisdom........
>
> Thanks!
>
> Jim Fleischer
> '95 s6 avant (better but not perfect)
> '83 ur (getting some action until the snow flies!)
> _______________________________________________
> S-CAR-List mailing list
> http://audifans.com/mailman/listinfo/s-car-list
> http://www.audifans.com/kb/List_information