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Home >> Honda >> 1978 >> Civic Base, 2D Hatchback, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Thermostatic Air Cleaners >> Testing >> Improper Door Action >> 1977-79 Models

1977-79 Models

  1. If air door did not respond as indicated in cold/hot engine tests (did not rise or fall), test the air bleed valve. To do so, disconnect and plug hose leading to air bleed valve. Crank engine for about 5 seconds.
  2. Air control valve door should rise and remain up for at least 3 seconds. If it does, replace air bleed valve and repeat test. If door does not rise or remain open, go to next step.
  3. Test air control diaphragm and check valve. To do so, disconnect vacuum hose from the air control diaphragm. Raise air control valve door manually and, while blocking the inlet pipe, release the valve door. See Fig 1.
  4. If valve door remains up, replace the check valve and repeat test. If valve door drops to closed position, replace the air control diaphragm and repeat test.
Fig 1: Testing Air Control Diaphragm & Check Valve
G09309903Courtesy of AMERICAN HONDA MOTOR CO., INC.
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