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Ignition Timing

  1. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral, until radiator fan comes on. Allow engine to idle. Connect tachometer to tachometer test connector (Clear, 2-pin connector with cover) located between air cleaner and right strut tower. Ensure engine idle is correct. See IDLE SPEED  .
  2. Connect SCS Service Connector (07PAZ-0010100 ) to 2-pin service check connector. Service check connector (Green/Black wire and Red/White wire) is located on right side of center console behind access cover, next to 16-pin DLC.
  3. Connect timing light to No. 1 spark plug wire. Check base ignition timing with no loads. See IGNITION TIMING  . Timing marks are located on flywheel/drive plate. Remove rubber plug from window in flywheel/drive plate housing, located under distributor. See Fig 1 . Timing is controlled by ECM/PCM. If timing is not as specified, replace ECM/PCM. Remove SCS service connector.
    IGNITION TIMING - (Degrees BTDC @ RPM)

    Application Specification
    Prelude 13-17 @ 650-750
    Fig 1: Locating Ignition Timing Marks
    G96J09585Courtesy of AMERICAN HONDA MOTOR CO., INC.
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