I have an '01 4.7 liter. I was replacing the spark plugs and when working on the rear-most passenger side plug a hose snapped. It's a very small diameter hose. I've taken some pictures: the area the hose occupies, the location of each end of the hose, the actual plugs on each end of the hose. The car starts without it, but I really don't want to drive to anywhere without knowing what it is.

 

Look like a vacuum hose to your cruse control.
It should not hurt to drive it. (see if the cruse works)

 

Looks like the vacuum line for the the cruise maybe. Pull the ned out of the connectors and shove the plastic hose back in them. If it isn't long enough you may have to look at replacing it or you could just cap it at the T and live without the crusie.

 

Thanks for the quick responses! The hose actually broke in several places trying to pull it all out to bring to a store. Looks like I can buy bulk hose so I'll bring in the ends and see what I can work out.

 

I too think it's for the Cruse Control.

You should be able to get one from the dealer.

 

It is the cruise control vac line. No "ifs" about it. 100% for sure from your photo below:



IndyD