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Home >> Mazda >> 1976 >> Cosmo Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Deceleration Control System - Rotary Engines >> Testing >> Evaporation COMPENSATOR Valve >> 1975 Models
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1975 Models

  1. Disconnect altitude compensator valve-to-evaporation compensator valve hose from evaporation compensator valve. Disconnect pressure sensing hose from evaporation compensator valve at "T" fitting.
  2. Start and run engine at idle. Close inlet to evaporation compensator valve. Engine speed should not change noticeably. Connect hose at "A" and apply air pressure to sensing hose. See Fig 1. There should be no increase in engine speed.
Fig 1: Evaporation Compensator Valve Test
G09310017Courtesy of MAZDA MOTORS CORP.