Open Loop??

["Jeff Goldberg" <jeffgold@erols.com>]

Hey Guys,

I have been trying to "tune" my 86 4KCSQ by ear and have made good progress.
It runs really smoothly when warm, but a little rough when cold. Starts a
bit hard too. My only criticism of warm idle is that it will sit at anywhere
between 800 and 1100 RPM when stopped for instance at a light. This choice
seems random. No surges, just inconsistent idle speed.
Got a dwell meter to check duty cycle at the test connector. There is
absolutely no dwell change when mixture or duty cycle settings are changed.
Am I running in open loop?
I know the PO put in a new Ox sensor and possibly disconnected in a way that
the computer goes into open loop. I have deduced that from posts on the
list. If so, how to reset computer??
My mechanic has some spare computers. If the computer is the problem, does
anyone know the part # for my computer?

BTW, I tested the Ox sensor according to Bentley. Heater has proper
resistance and it is getting 12v (actually 13) at the connector.

Thanks for any ideas,

Jeff
86 4KCSQ Daily Driver
86 4KS      Spare