200QA suddenly no start, no spark - Solved!!!

[hayes myers]

Not worth much... 800 bux and you did well.... the guy i bought mine off of
did extremely well. mungiecake.

On Mon, Mar 22, 2010 at 1:26 PM, David Michael <adavidmichael at gmail.com>wrote:

> At lunch time I checked that the b+ (track 15) was 12V and it was. So then
> I temporarily hooked up my old coil (one connector, high tension lead and a
> ground clip) and the car fired right up.
>
> "course when I went to install the old coil more permanently,
> I totally forgot that the nuts on the back side of the firewall (in
> the plenum) are NOT captive, and they fell off and rolled under the
> blower. Fortunately we have a metric screw cabinet at work..
>
> While I can't be sure its the actual cause I suspect that, as a few folks
> had postulated (along with Scott M's website), the transistor triggering
> unit went bad. Ironically, it's a new unit I
> installed prophylactically about 4k miles ago. Infant mortality.....
>
> BUT, I  this is the last straw. It's time for her to go. I no longer have
> time to keep up.  Car runs like a freight train, but needs some peripheral
> work (window lifts, A/C, etc) and I no longer have time and don't want to
> spend the money. Anyone have any idea what a 200QA with 235k that is
> running
> extremely well but needs work is worth?
>
> Thanks again to everyone for your help with this, and many other
> problems.....
>
> Dave
>
>
>
> On Sun, Mar 21, 2010 at 8:14 AM, David Michael <adavidmichael at gmail.com
> >wrote:
>
> > Thanks for all your suggestions. Based on what you all have said, I need
> to
> > back the diagnosis up a step and 1st make sure the coils is powered.
> SJM's
> > website suggests that it if the ignition switch can fail and stop
> powering
> > the ignition circuit of the ECU.
> >
> > In any case, I will check 12V and use my LED tester to verify that the
> ECU
> > is sending coil triggering pulses to the coil. Though it will have to
> wait
> > till Monday - car is still sitting in the parking lot at work
> >
> > Folks on this list are great. Only way I could have gotten to 230k....
> >
> > Dave
> >
> >
> > On Sun, Mar 21, 2010 at 3:17 AM, Huw Powell <audi at humanspeakers.com
> >wrote:
> >
> >>
> >>
> >>  If what you mean is the coils don't fail that much, but the POS
> >>> (transistor) does, then
> >>> that is correct.  The problem is probably not the coil itself, but the
> >>> Darlington
> >>> Transistor that is mounted on the coil, but generally the assembly is
> >>> referred to a the
> >>> coil by most
> >>>
> >>
> >> The transistor failing is not the coil failing.  Coils are incredibly
> >> simple.  Measure both sides.  Good?  then good.  I'm running an old audi
> >> coil on my '57 Trojan loadster.  Made homemade ballast resistor.  Works
> >> great.
> >>
> >>
> >> --
> >> Huw Powell
> >>
> >> http://www.humanspeakers.com/audi
> >>
> >> http://www.humanthoughts.org/
> >>
> >
> >
> _______________________________________________
> quattro mailing list
> http://www.audifans.com/mailman/listinfo/quattro
> http://www.audifans.com/kb/List_information
>