[s-cars] Apikol coil kit failure question

[Robert Myers]

Ron,

A failing coil usually manifests itself as a high boost miss which 
goes away when you get down off the loud pedal somewhat.  It will get 
progressively worse until the miss is present all the time and it 
then emulates a failed PSO.

To identify the failing coil:

Disconnect the plug for injector #1 and go for a high boost run.  The 
engine will, of course be missing full time on #1 and if the failing 
coil is still active (IOW, it isn't #1) the miss will get even worse 
at boost (2 cylinders missing rather than just one) and, therefore 
you can conclude that the failing coil isn't #1.

Repeat for the rest of the coils one at a time.  The failing coil is 
the one which when tested doesn't have the miss get even worse when at boost.

Bob

At 01:47 PM 1/2/2009, ron kirkham wrote:
>For those of you with this kit, I have a question on coil failures.  I have
>the modified coils that were supplied with the kit (not the high HP kit, the
>normal HP kit) and an extra for the inevitable failure.  This kit was
>purchased in October of '07, and I have the -115R coils.  Plugs were
>replaced at the same time as the coil install with new boots.  Victim is my
>'93 S4 with 235k miles.
>
>My question is, do the coil failures "feel" the same as the original stock
>coil/PSO set up?  I am getting a higher rpm, heavy load studder
>(ocassionally) that feels very similar to previous coil failures I have had,
>but this is my first issue with this new set-up.  What is the best way to
>figure out which coil may be failing since this only happens when I'm heavy
>on the go pedal?  Do I just wait for the coil to fail at idle so I can pull
>injector plugs?
>
>Also, I don't beleive this to be the ignition switch related shut-off that
>many have reported, it's not nearly that severe.  Just a slight
>studder/stumble that doesn't happen if I'm not heavy on the gas.  Besides,
>as preventative maintenance, I replaced the ignition switch with an Audi
>fresh one about 1.5 yrs. ago.  Not to say that could not be failing, but I
>don't think it's that.
>
>Any input appreciated. TIA
>
>Ron Kirkham
>93 S4, with the stumbles to start '09
>95.5 S6A, safely garaged
>_______________________________________________
>S-CAR-List mailing list
>S-CAR-List at audifans.com
>http://www.audifans.com/mailman/listinfo/s-car-list
>
>No virus found in this incoming message.
>Checked by AVG - http://www.avg.com
>Version: 8.0.176 / Virus Database: 270.10.2/1871 - Release Date: 
>1/1/2009 5:01 PM