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Im not convinced that your lambda system it working even though you said the dome light is on.
Do this test.
Get the car running and then disconnect the OX relay under the passenger seat. What happens? If you are using the stock USA CIS system from a 1981 911 the Frequency Valve MUST be operating. If the FV isn't working, you can get to run butt not run good by richening the mixture.- CO 5%!
If the FV valve is not working, pull the connector and put 12v (Fused) to one terminal and a ground to the other. Key on, push up AFM arm and the FV should vibrate.
Also, what is your cold control pressure?
Where are you measuring CO? Without a cat, your CO should be 1.0 to 3.0 %- you have SSI right.?
Make sure you disconnect the O2 sensor when setting the CO if the FV is working.
Let us know.
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Dave K
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