Anti-AFTERBURN Valve
The anti-afterburn valve supplies additional air from the air cleaner to intake manifold to prevent afterburning of fuel vapors during sudden deceleration. The coasting valve serves the same purpose while vehicle is coasting or slowly decelerating at speeds above 1150 RPM. Both units also operate immediately after ignition switch is turned off. Improper operation of these components will cause backfiring, rough idling or poor engine braking during deceleration.