The short version is that the CIS-E is basically the mechanical CIS (Constant Injection System), with electronics added to control emissions via a frequency-valve (can't remember what it is called here) on the side of the fuel distributor. With a fault in the system, such as un-plugging the O2 sensor, it will revert to the mechanical system where the air-flow sensor plate moves a metering pin and directly changes the injection flow rate (all six cylinders, all of the time, at the same rate).

You are indicating through your experimentation that the basic CIS including mechanical parts such as the fuel pressure regulator, and the fuel pump, the injectors and injection distributor, seem to be operating correctly, and likely (not certainly) within spec. When the electronic brain is put back into the loop (plugging in all components), it fails, which indicates that somewhere in a sensor, the computer, the wiring and grounds, there is something out-of-spec. There are restistance vs temperature values for the temperature sensors, and I believe values for the O2 sensor available and the sensors can be measured with a good DMM/VOM. They can also be bypassed using a resistance-substitution box and a few BOSCH connectors cut from junkyard cars to see if the proper resistance will create the proper running condition.

It is my further opinion, that the ignition system is in adequate condition based on your experimentation and previous postings.

Check the sensors, a couple of sensors out of spec can really make a car run poorly. I'm betting someone here knows the correct resistance for that intak-air sensor for example, you'll need the temperature at which you measured it BTW.

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Gone to the dark side

- Jeff