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Home >> Mazda >> 1978 >> Cosmo Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Deceleration Control System - Rotary Engines >> Testing >> Altitude COMPENSATOR Valve >> 1974 Models
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1974 Models

Disconnect air inlet hose from altitude compensator valve. With engine at idle, place finger over altitude compensator inlet. Engine RPM should decrease by a small amount. If not, replace altitude compensator valve.