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Hello Don,
My guess is that people think they are disconnecting a smog device and that must be good for performance. CIS lambda was only used for a few years and few people bother to figure out what all of the switches, sensors and control boxes are doing. Unfortunately, most manuals, including the Bentley and Haynes, do not explain it correctly. The BOSCH text and Probst book are still the best sources of accurate info. The system allows you to make open loop WOT mixture adjustments to optimize performance and still have good cruise economy. But only with the sensor connected.
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Paul
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