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Home › Infiniti › 1993 › Q45 Base › Repair and Diagnosis › Engine Performance › Engine Controls - Adjustments › Adjustment › 4-Cylinder Idle Speed

4-Cylinder Idle Speed

  1. Warm engine to normal operating temperature (needle in middle of coolant gauge). Check and adjust ignition timing (if necessary). See IGNITION TIMING.
  2. Turn engine off. Disconnect throttle position sensor connector and restart engine. Check idle speed. See IDLE SPEED & CO LEVEL  table. If idle speed is not within specification, snap throttle to 2000-3000 RPM, 2 or 3 times, under no-load and then allow engine to return to idle. Locate idle speed adjusting screw on Idle Air Adjusting (IAA) unit and turn idle speed screw. Rotate idle adjusting screw clockwise to decrease idle speed and counterclockwise to increase idle speed.
  3. Turn engine off. Reconnect throttle position sensor connector and restart engine. Run engine at 2000 RPM for about 2 minutes under no load, and then allow engine to return to idle. Idle speed should be as specified.
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