Anti-Afterburn Valve

With suction hose removed from valve and engine at idle speed, hold hand over opening of suction hose. If strong vacuum is felt, valve should be replaced. Run engine at 3500-3800 RPM. When throttle valve is closed suddenly, air should be sucked in for.4-1.0 seconds through air suction hose. Run engine at idle speed and remove anti-afterburn valve solenoid wire. Air should continue to be sucked in through hose while wire is disconnected.