It's not clear to me that you're measuring the duty cycle correctly, and you may have polarity reversed. Is your engine really a CA model? Look at the emission/tuneup label in the engine compartment. It will say whether it's 49-state or 49-state AND CA. If it's a CA model special test procedures apply.

Make sure you review and understand:

www.landiss.com/mixture.htm

and pay particular attention to the special procedure for CA models if your car really is a CA model.

Duke