Hi,
Car had been sitting for a couple years. I replaced the brittle rubber breather tube (valve cover to air filter) and fixed all the broken smaller vacuum lines and replaced the battery. I then flushed the tank, replaced the in tank screen, both pumps, and flushed the remaining bad gas from the filter and lines. Labeled and removed the injectors and cleaned them on my bench and flowed them; Three at about 50ml three at about 60ml. Removed fuel distributor, installed injectors, put plastic bottles over injectors and checked flow with distributor plunger pushed completely in (WOT). Adjusted flow rates of four injectors until all injectors flowed the same. Cleaned the throttle body and removed the bad gas that had puddled under the butterfly, check the EGR valve and blew air through the EGR tube. Put it all back together after more cleaning and it started right up. Great idle until warm and then idle hunted until the motor died. Would only start (warm) with acc pedal on the floor.

Assuming a vacuum leak, I replaced both hoses to the Idle Speed Air Valve (Y6) (please correct me if it has another name. It sits right above the #2 intake runner.) since they were hard. Started right up again (cold), but idle hunted again when warm. Checked X11 (driver’s fender) at 2 and 3. Key On, Engine OFF
8.63 volts / 12.56 volts at battery
With Engine running I always get about 12.4 volts until I rev the motor, then I get about 7 volts (fluctuating)
Checked 16 pin connector right in front of battery at pin three. Took pin three to ground for about three seconds and got one flash. Checked OVP relay fuse, good.
Installed wide band O2 sensor in the tailpipe and saw 9 / 1 at idle. Played with Idle Control setting (3 mm Allen) until response was good and wide band told me I was in the 13 / 1 area (at no load). Interestingly I found that going slightly richer on the idle setting solved my hunting idle problem. Let car idle again and I was back to 9 / 1. Turned car off and tried to restart. Once again, only starts with throttle fully open. Once running again, I disconnected the O2 sensor. Idle stumbled, so I reconnected it and idle returned to normal.

Checked X11 at 2 and 3 again. Same fixed high voltage until I rev the motor. About all I have left to check is the current to the Electrohydraulic Actuator, but have not because I would have to make a piggyback harness.
Questions:
Is the CIS-E system supposed to run at 9 / 1 at idle?
Isn’t the Key On Engine Off X11 2-3 reading supposed to be closer to 3.8 volts?
Ideas?