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Home >> Honda >> 1978 >> Civic Base, 2D Hatchback, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Ignition Timing Control - Civic >> Testing >> Ignition Timing Retard >> 1974 Models
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1974 Models

  1. Check for loose, disconnected, or damaged vacuum hoses and replace as necessary. Remove distributor cap and check that diaphragm rod is properly connected and breaker point base plate moves freely. Reinstall distributor cap.
  2. Connect tachometer and timing light to engine. Start and run engine at idle. Disconnect vacuum hose from distributor vacuum retard diaphragm and connect vacuum gauge to hose.
  3. Vacuum gauge reading should be greater than 12 in Hg. If reading is low, clean carburetor vacuum port. If vacuum remains low, check engine mechanical condition.
  4. Set ignition timing to 5 degrees BTDC. Reconnect vacuum hose to retard unit and check ignition timing. Timing should be TDC (zero degrees). If not, replace distributor vacuum advance/retard unit.
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