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Home › Nissan-Datsun › 1981 › 810 Base, 4D Sedan › Repair and Diagnosis › Engine Performance › Engine Control Systems › Controlled Deceleration Device › Testing & Adjustments › BCDD Operating Pressure › Checking BCDD Operating Pressure

Checking BCDD Operating Pressure

  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 the engine under no load and note vacuum reading. Increase engine speed to 3000-3500 RPM, then quickly close the throttle. Manifold vacuum should increase to 23.6 in (600 mm) Hg or more, then gradually decrease to level noted at idle.
  3. If BCDD operating pressure at idle is not as specified in "BCDD Operating Pressures" table, proceed as follows:
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