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Home >> Volvo >> 1992 >> 740 GL, AW70 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Idle Speed & Mixture >> Idle Mixture

Idle Mixture

  1. Warm engine to normal operating temperature. Check idle speed and ignition timing. Disconnect oxygen sensor. Check CO level. See IDLE SPEED & CO LEVEL  table.
  2. If CO level is incorrect, turn off engine. Drill two 5/16" holes in adjustment plug. Pull out plug using snap ring pliers. Start engine, and adjust CO level.
  3. Turning screw counterclockwise decreases CO level. See Fig 1 . Turning screw clockwise increases level. When adjustment is completed, reconnect oxygen sensor lead and remove test equipment. Seal idle mixture screw using a new plug.
Fig 1: Adjusting Idle Mixture
G121532Courtesy of VOLVO CARS OF NORTH AMERICA.
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