OXS Freq. Troubleshooting Question

["Southerlin, Russ S" <STHRRSAB@edex.litc.lockheed.com>]

I have more questions on my hard start problem.

Background: I have checked many times for vacuum leaks, checked
timing, replaced one injector - checked all others for leaks, I still
have hard starting after a hot soak of about 30-45 minutes.

I got a chance to do some trouble shooting this weekend and found
some wierd stuff. I borrowed an oscilliscope to check the OXS freq.
valve duty cycle and once I got into it I found some conflicting
directions on exactly how to check it. I have got information from 3
diffferent sections of some Mitchell manuals that my library has an
fische(?) 1)CIS Digital Sys 2) 1987 Tune Up and 3) 1987 Bosch Lambda
Gen Info.

The 1987 tune up section describes bridging the fuel pump,
disconnecting the #1 wire from the coil, disconnecting the crankcase
breather and pluging, and venting the charcoal can to atmos. None of
the other sections tell you to do this.
(I vented the "banana" hose to atmos. and plugged the valve cover
fitting it goes into).

What I found was:
1) with all breather hoses and coil #1 wire connected:
With a cold eng (45 deg overnight) and the fuel pump relay bridged,
the F/V was at 95% duty cycle (12.8 mSec on, 0.7 mSec off).

Cold cranking duty cycle was about 33% (12.8 mSec on, 0.7 mSec off)
and on start up it remained at 33%.

About 45 sec after start up duty cycle went to 95% (12.8mSec on,
0.7mSec off)

As engine warmed up duty stayed at 95%, if the engine rpm was
increased the duty would go to 50% and then return to 95%.

After engine was warm the duty would be 50% on start up and after
about 10 sec would go to 95%. 

2) With breather, charcoal can and #1 coil wire disconnected:
I could not get the car to start with this config. If I disconected
them one at a time while the car was running I could disconnect
either the breather or the #1 wire but as soon as both were
disconnected the engine would stall. 

Questions:
What is the correct procedure for checking the duty? Should I try to
adjust the duty cycle to its correct value (I don't have a CO meter).
Could I have a vacuum leak?

THANKS FOR ANY HELP.