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Home >> Porsche >> 1982 >> 924 Standard Trans, Trans Mfr CD 016.G >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Digital Ignition Timing >> Adjustment >> Idle Adjustment

Idle Adjustment

NOTE: The Digital Ignition Timing Control system controls idle speed by varying the ignition timing. Idle speed adjustments are made using an ignition timing light. Sensor temperature must be below 120°F (50°C) before making idle adjustment.
  1. With engine off, remove temperature sensor from intake manifold, and place it in the fresh air tray behind engine firewall. Leave wire connected to sensor. Install a plug into temperature sensor hole (in intake manifold).
  2. Start and run engine until normal operating temperature is reached. Connect a CO tester according to manufacturer's instructions. Attach a timing light to engine.
  3. Turn the idle control screw (air by-pass screw), until ignition timing mark (dot on flywheel) is fully visible at timing pointer edge. Check idle speed. Speed should be below 900 RPM.
    NOTE: Timing mark (dot) will move around because of the computer regulating timing.
  4. If necessary, adjust CO level at same time idle adjustment is being made. With idle speed (and CO level) adjusted, turn engine off and remove all test equipment. Replace temperature sensor.
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