'86 CGT no start (update)

[Craig D. Niederst]

Thanks to all who replied. After dinner I pulled out the Bosch 3 electrode
spark plugs (maybe had 8k or so on them), and swapped them with the nearly
new single electrode Bosch Platinums that the car came with when I bought
it. The plugs I pulled were a bit sooty and smelled of gas, but did not look
to be in too bad of shape. I also pulled off the cap, and cleaned up the
contacts on both the rotor and cap. I also had a new set of Bosch plug wires
lying around that I was going to install anyway, so I installed them also.
Hooked up the CGT to our old Plymouth Voyager for an added "electron boost,"
and after a few cranks, fired right up. But now there is a new problem. At
idle, the car runs nicely. But when I hit the gas and hold the pedal steady,
the idle jumps around between 1-3k rpms (kinda like a cycling). If I pull
the electrical connector to the ISV and then hit the gas, no cycling occurs
and it runs fine. I did clean up this particular ISV this afternoon while I
was troubleshooting the no-start condition, so I swapped it for another used
one I had on the shelf. Car still does the same thing when the ISV is
plugged in, and is OK when disconnected. Before today, the ISV had no effect
whatsoever if its plug was connected or not. For now, I just left the plug
disconnected, but any ideas what is going on now? TIA.

Craig
'92 100S (90k)
'86 CGT (193k)

----- Original Message -----
From: "Craig D. Niederst" <niederst at telerama.com>
To: "Quattro List" <quattro at audifans.com>
Sent: Wednesday, November 15, 2000 5:58 PM
Subject: '86 CGT no start


> Odd behavior with the '86 CGT today, possibly brought on by the cold
> weather. Fire car up this morning (temps in 20s), starts fine, so brother
> pulls the car into the driveway. About 45 minutes later, brother needs to
> leave for work, and again the car fires up right away. Shifts into
reverse,
> hits gas to get him moving, and the car dies. While the car cranks fine,
it
> has not started since. I have checked the archives and my lame Haynes
manual
> that came with the car, and most troubleshooting deals with the obvious
> check to see if you are getting fuel (fuel pump) and getting spark. I have
> confirmed that I am getting spark, although the color of the spark appears
> to yellow/orange in color and not blue. I also appear to be getting fuel,
> since when I pulled the plugs they smell of gas, and also fuel spewed out
of
> the cold start valve when I removed it (I reinstalled the valve and
cranked
> again, pulled it off again and fuel pressure had built back up). The CGT
has
> always idled a bit rough, but has always started right up. Any ideas on
> where to go next? TIA.
>
> Craig
> '92 100S (90k)
> '86 CGT (193k)
>
>