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Home >> Nissan-Datsun >> 1982 >> 200SX 2D Hatchback, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Intake Manifold Vacuum Control System >> Testing >> Boost Control Unit >> Pickup Models
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Pickup Models

  1. To check pressure, engine should be at normal operating temperature, idle speed set to specifications and transmission in Neutral. Connect a tachometer to engine and a vacuum gauge to intake manifold.
  2. Run engine under no load and note vacuum reading. Increase engine speed to 1500-2000 RPM, then quickly close the throttle. Manifold vacuum should increase to 23.6 in. Hg or more and then gradually decrease to level noted at idle.
    BOOST CONTROL UNIT OPERATING PRESSURES (At Sea Level)

    Application Pressure (In. Hg)
    Pickup 22.8-24.4
  3. If boost control unit operating pressure at idle is not as specified, see ADJUSTMENTS in this article. 
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