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Home >> GMC >> 1982 >> Magnavan Standard Trans >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> ROCHESTER Models M4MC & M4ME 4-Barrel >> Adjustment >> Front Air Valve Rod

Front Air Valve Rod

  1. Using an outside vacuum source, seat primary (front) choke vacuum break diaphragm. Plug purge bleed hole (if equipped) with masking tape. Hole is found in end of diaphragm.
  2. Make sure air valve is completely closed. Insert a.025" drill or pin gauge between rod and end of slot in lever. See Fig 1.
    Fig 1: Front Air Valve Rod Adjustment
    G09360546Courtesy of GENERAL MOTORS COMPANY

    Place drill or pin gauge between rod and end of slot in lever. 

  3. Bend rod at point shown in Fig 1 to adjust clearance in slot. Remove tape and reconnect vacuum hose to diaphragm.