honda Workshop Repair Guides

Honda Workshop Service and Repair Manuals

Idle Up Control Valve > < Two-Way Valve <--> [Fuel Tank Pressure Release Valve]|Locations
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Two-Way Valve: Testing and Inspection

1.

Remove filler cap.

2.

Remove vapor line from fuel tank on 1983-86 Prelude and 1984-86 Civic, or from liquid/vapor separator on other vehicles.  Connect to T-fitting
from suitable vacuum gauge and vacuum pump.

3.

Slowly draw a vacuum while observing gauge.  Vacuum should stabilize at .2-.6 inch Hg.

4.

If vacuum does not stabilize within specifications, replace valve and repeat test.

5.

Slowly pressurize vapor line while observing gauge.  Pressure should stabilize at 1-2.2 inch Hg.

6.

If pressure does not stabilize within specifications, replace valve and repeat test.

Idle Up Control Valve > < Two-Way Valve <--> [Fuel Tank Pressure Release Valve]|Locations