black box in engine

[jtfd93]

I changed spark plugs, put dielectric grease in both ends of the coils, changed the serp belt, changed the fuel filter. I began hearing a psss psss psss noise from the engine about 10 minutes after I began to drive home after doing all that work. I popped the hood and noticed an open port ontop of the motor. I put my finger over it and it was a vacume hole. I found an open hose. I must have knocked the hose off changing the plugs. It goes to a black rectangular box on the drivers side in the engine compartment next to the fuse box. What is that box and does anyone know what that vaccume hose went to? I still has heat and cruise. I am not sure about the ac cause of it being so cold. I went to Napa this morning and got a replacement hose and when I was replacing it I checked it and there was no suction.. Any suggestions? thanks

[Hi Volt]

The black box you refer to should be your EVAP system. It uses engine vacuum to test the fuel vapour return system for leaks. If you had vacuum before but not after it may simply be because of a solenoid being closed versus open before. This should also cause a check engine light after a a while. The easiest way to find where a single missing hose goes is to take the free end and move it in a arc of it's length. Within that area an open port should be visable. Short of that you will need an EVAP hose diagram.

[mral1515]

It is an evap hose. It only has a vacuum applied when the VSV is turned on. The purge hose and it is used to clear all the hydrocarbons from the charcoal canister and burn them through the engine. Very common to find this hose knocked off. If left off long enough it would cause a check engine light to come on. Might try installing a small clamp on it.