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Anti-AFTERBURN Valve

  1. Remove air cleaner cover. Start engine and allow it to idle. Place finger over air inlet tube and check for vacuum. There should be no vacuum. If vacuum is felt, replace anti-afterburn valve and repeat test.
  2. If there is no vacuum, raise engine speed to 3500 RPM and quickly close throttle. Again check for vacuum at inlet tube. There should be vacuum as throttle closes.
  3. If vacuum is felt, valve is okay. If vacuum is not felt, locate restriction or blockage and retest. If vacuum is still not felt, replace anti-afterburn valve and retest.
Fig 1: Testing Anti-Afterburn Valve
G09309879Courtesy of AMERICAN HONDA MOTOR CO., INC.
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