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Home >> Peugeot >> 1981 >> 505 STI, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Deceleration System >> Adjustment >> Deceleration Vacuum Unit

Deceleration Vacuum Unit

  1. Connect tachometer, warm engine to normal operating temperature, and adjust idle to 900-950 RPM. Stop engine.
  2. Disconnect green ringed hose from vacuum tee. Disconnect red ringed hose from deceleration valve and connect to vacuum tee where green ringed hose was removed. Remove vacuum unit cap nut and gasket. Start engine. Turn adjusting screw with 3 mm Allen wrench to obtain idle speed of 1450-1550 RPM.
    Fig 1: 505 Deceleration Vacuum Unit Adjustment
    G09313994Courtesy of PEUGEOT MOTORS OF AMERICA, INC.
  3. Stop engine and reconnect hoses. Install vacuum unit cap nut and gasket. Retest deceleration system.
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