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Thanks, the relationship between grounding the o2 input and the duty cycle was just the opposite of what I expected but I'm probably missing something. Like any control system, if the feedback between the sensor and the actuator was out of phase, it would probably oscillate...
>My suggestion would be to get a manual and try to understand how the system works, then do the basic troubleshooting.
Will do, I have an old copy of the Probst book and will do some reading, thanks again.
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