odd running/CTS/mystery plug

[Huw Powell]

> On my 82 Coupe CIS it has always cranked for 6-8 seconds when cold before
> starting.  Then it idles a little rough.  Once warmed up it cranks for 1
> second then runs well.
>
> I'm in FL and it has gotten colder then normal(down in mid 30's).  Anyway, if
> I go out on a 35F morning and start it, it fires the instant I hit the
> ignition switch.  Then it has the most beautiful idle, and runs purrfect.
> But, if it was a 45 or above morning, thats when it crank 6-8 seconds before
> firing.  Thoughts?

Audis often seem to like to start really well when it is quite cold, and
not quite so happily when it is half warm out.

General tune up issues might affect that sluggish cold weather start -
remembering that your normal "cold" weather is pretty mild up here.
Your 35 degree temp is just beginning to enter into "slightly cool out."

> I unplugged the CTS and will see if it has any effect, there was some mention
> in archives.

what is a "CTS"?

> What is the female plug for right by the oxy sensor wiring.  Part # 171 971
> 999A
> I get 8.2 volts across terminals when running...what does this mean?

What I think you are referring to is the test port for the frequency
valve duty cycle.  small white connector (may be yellowed by now) with
two round female connectors in it?

Don't measure voltage there, you measure duty cycle, or how much the
valve is "on" as a percentage.  Stuff about that is here, along with
some photos, if that helps:

http://www.humanspeakers.com/audi/timing.htm

(middle menu on left of main page, under "tuning CIS Jetronic")

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/