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Home >> Porsche >> 1982 >> 928 Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Specifications >> Tune-Up - V8 >> Idle Speed & Mixture

Idle Speed & Mixture

  1. Fold up foot support on passenger side under dashboard. Disconnect plug from oxygen sensor (left side of footwell). Connect CO meter to test point on catalytic converter and connect tachometer.
  2. Adjust idle speed using screw in front of throttle housing. If mixture must be adjusted, insert tool through opening in air flow sensor. Rotate clockwise for richer mixture and counterclockwise for leaner mixture.
    IDLE SPEED & CO LEVEL

    Application Idle RPM CO%
    All Models 700-800 (1) 0.4-0.8
    (1) With oxygen sensor disconnected.
  3. When idle mixture and speed are correct, remove test equipment. Connect oxygen sensor plug and coat thread of catalytic converter test cap with anti-seize compound.
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