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Home >> Honda >> 1979 >> Prelude Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Throttle Control System >> Description >> Throttle Control Valve >> High Altitude Models

High Altitude Models

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This control valve is similar to the valve used on California applications, except that tension on the diaphragm is controlled by an aneroid bellows, which is sensitive to altitude (atmospheric pressure). See Figure.