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Vacuum Switch: Description and Operation

OPERATION


This switch is closed during engine idle and part throttle engine operation (Adaptive Mode of Operation).


NOTE: In the Adaptive Mode, the mixture control (MC) solenoid is controlled to produce predetermined air/fuel mixture ratios. During acceleration from idle to part throttle and deceleration from part throttle, the oxygen sensor cannot react fast enough to the changes in the air/fuel mixture. Consequently, high HC and CO exhaust gases would be emitted momentarily unless the system changed to the predetermined (programmed) air/fuel mixture ratios.


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