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EVAP Two Way Valve

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Acura NSX-T, 1999 Acura NSX, 1998 Acura NSX-T, 1998 Acura NSX, and 1997 Acura NSX-T. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the fuel filler cap.
  2. Remove vapor line from the two way valve located under the engine compartment fuse/relay box. Connect vapor line to T-fitting from vacuum gauge and vacuum pump as shown. See Fig 1 .
  3. Apply vacuum slowly and continuously while watching the gauge.
  4. Vacuum should stabilize momentarily at 0.2-0.6 in. Hg (5-15 mm Hg).
  5. If vacuum stabilizes and the valve opens below 0.2 in. Hg (5 mm Hg) or above 0.6 in. Hg (15 mm Hg), install new valve and retest.
  6. Move vacuum pump hose from vacuum to pressure fitting, and move vacuum gauge hose from vacuum to pressure side as shown. See Fig 2 .
  7. Slowly pressurize the vapor line while watching the gauge.
  8. Pressure should stabilize above 0.3 in. Hg (8 mm Hg).
  9. If pressure momentarily stabilizes and the valve opens above 0.3 in. Hg (8 mm Hg), the valve is OK.
  10. If pressure stabilizes below 0.3 in. Hg (8 mm Hg), install a new valve and retest.
Fig 1: Connecting EVAP Vacuum Test Equipment
G00125728Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Connecting EVAP Pressure Test Equipment
G00125726Courtesy of AMERICAN HONDA MOTOR CO., INC.
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