Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Air Injection Check Valve: Testing and Inspection
Anti-Backfire Gulp Valve
1.
Disconnect supply hose from air pump side of valve.
2.
Observe valve pintle by looking into valve through disconnected port.
3.
Accelerate engine to 3000 RPM, then release throttle. Pintle should be open and then close.
