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Air Suction Valve

  1. Check vacuum lines for proper connection, cracks, blockage and routing. Bring engine to normal operating temperature (cooling fan comes on). Turn off engine and restart. Using a stethoscope, listen to air suction valve. Within 20 seconds after restart (10 seconds on Coupe), air suction noise (bubbling noise), should be heard.
  2. If no suction noise present, disconnect hose from top of air suction valve and attach a vacuum gauge. Turn engine off. Restart and check for vacuum within 20 seconds after restart (10 seconds on Coupe).
  3. If vacuum is present, replace air suction valve and retest. If no vacuum is present, See AIR SUCTION CONTROL SOLENOID VALVE  , TEST ONE.
  4. Turn engine off. With vacuum hose still disconnected, start engine. Check for air suction noise from air suction valve at idle, 30 seconds after restart (15 seconds on Coupe).
  5. If no air suction noise present, test is complete. If air suction noise is present, See AIR SUCTION CONTROL SOLENOID VALVE  , TEST TWO.
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