Anti-Backfire Valve
- Disconnect air hose to intake manifold at the anti-backfire valve and plug hose. Open and close throttle rapidly. If air flow is felt for one or two seconds at the valve outlet to the manifold, valve is operating correctly.
- If air flow is not felt, or air flow continues for more than two seconds, valve should be replaced.
- Connect air hose to intake manifold and disconnect air inlet hose from air pump at anti-backfire valve. If engine speed changes excessively, valve should be replaced.