Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Vacuum Delay Valve: Testing and Inspection
Ported Vacuum Valves
Fig. 22 Ported vacuum switches & vacuum control valves
1.
With engine cold, ensure that passage A to B is closed, and passage A to C is open, Fig. 22.
2.
Start engine and run until it reaches normal operating temperature, then ensure that passage A to B is open and passage A to C is closed. On
4-port valve, check A1 to B1 and A2 to B2 separately.
3.
If valve does not operate as described, replace valve.
