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The Safc just adjusts the Map sensor according to the throttle position sensor and rpm's. The ECU will compensate and change A/F ratio back to stoich. I run without O2 sensor in limp mode and then you can add or subtract fuel without the ecu interfering. It's best to check exhaust temp with EGT sensor. I adjust for light load cruising and there is not much risk at lean light load conditions.
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