lemon-mirror:
Home >> Mercedes Benz >> 1981 >> 300D >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION >> Testing >> Vacuum Control Valve

Vacuum Control Valve

  1. Connect vacuum gauge between thermal vacuum valve and EGR valve. Increase engine speed to 1000 RPM (do not pull on STOP lever).
  2. Vacuum should measure 5.7-6.7 in. Hg on non-Turbo models, and 4.9-5.7 in. Hg on Turbo models. If not, check orifice to ensure it is clean. If level is too high, install a larger orifice. If level is too low, install a smaller orifice. If vacuum level cannot be correctly adjusted, replace vacuum control valve.
Fig 1: 300 Series Diesel Exhaust Gas Recirculation (Turbo)
G09313981Courtesy of MERCEDES-BENZ USA
· About lemon-mirror