F 150 4WD Pickup V8-302 5.0L (1986)
Air Injection Control Valve: Description and Operation
Combination Air Bypass/Air Control Valve
The Combination Air Bypass/Air Control Valve (9F491) combines the functions of the air bypass valve (9B289) and the air control valve (9F491) into a
single unit. There are two normally closed valves; the non-bleed type Figure 1 and the bleed type Figure 2 all of which look alike. One distinguishing
feature will be that the bleed type will have a the percent of bleed molded into the plastic case.
