Cap it off till you find out.....might not even need it....but sure don't need it open!!
`92 F150 Flareside - IRIS MET/Gray
5.0, AOD, 355 gears, dual glasspacks no cats, K&N drop in filter, MSD Blaster Coil, Cap and Rotor, Ford Racing 9mm wires - Blue
It's not pink......it's IRIS.
I cant see a picture of it at all. If it is coming off the intake then it is going either to the brake booster, vacuum resivior, vacuum resevior/cruise, HVAC, Fuel pressure regulator, or the c6 if so equipped. Then the passenger vacuum reserve supplies the thermactor switches and the egr switch. Depending on the switch they would control the thermactor bypass or the cat/head flow of the A.I.R. system, this has to be determined by the signal wire color to figure out which vacuum switch is being operated. I could not see your picture of the hose. Also the truck has listed in the engine bay the proper vacuum hose routing by color of the hose if it has not been destroyed by the years.
Stock 1978 F250 Custom regular cab 4x4 with 351M and 4 spd.
1991 Bronco silver anniversary, 5.8L EFI, E4OD swapped for C-6, custom trimmed rear fenders finished in rust.
2007 F150 Lariet super cab with SnugTop bed cap and 5.4L V-8
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