Anti-Backfire Valve

The anti-backfire valve is used to prevent backfire in the exhaust system during deceleration. At the start of deceleration, the air/fuel mixture in the intake manifold becomes too rich to ignite and burn in the combustion chamber. The anti-backfire valve provides additional air to the intake manifold to make the air/fuel mixture leaner and prevent backfire.

1. With engine at normal operating temperature, disconnect anti-backfire valve hose at air cleaner and place finger over end of hose.
2. Increase engine speed to 3000 RPM and allow it to return to idle. If suction is felt at end of hose, anti-backfire valve is functioning properly. If not, replace valve.