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Home >> Oldsmobile >> 1983 >> Toronado 4.1 4 >> Repair and Diagnosis >> Engine Performance >> System >> EGR System - Diesel >> Component Testing >> Vacuum Modulator Valve (VMV)
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Vacuum Modulator Valve (VMV)

  1. Block drive wheels and apply parking brake. Place transmission in "P". Start engine and run at slow idle. Connect vacuum gauge to hose that connects to port marked "M".
  2. There should be at least 14 in. Hg of vacuum. If not, check vacuum pump, VRV, solenoid and connecting hoses.
  3. Reconnect vacuum hose to port "M". Connect vacuum gauge to port "D" on VMV. Vacuum reading should be 13 in. Hg. If not, replace VMV.
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