This is the T that runs from passenger side rear plenum port to the HVAC line then off to the cruise control servo. Is there a name for this? Mine broke so I just pulled the hose that ran to cruise control, and connected the HVAC line directly to the plenum. Do I need to cap the connection at the cruise control servo to prevent a vacuum leak?? Or is it cut off from everything now that I disconnected it from the plenum vac lines?

 

I may be wrong here but I believe the proper name for that is a check valve.

 

Yep looks like a check valve with t outlet to me. You shouldnt have to cap off that vacuum line(to the cruise) but it wouldnt hurt anything if you did. You might want to try using a regualar t if you cant find the one with the check valve. Youll know right away whether it worked or not. If the hvac goes to defrost whenever you smash the gas you need the checkvalve too.

 

it's called a heater control valve, AC delco part # 14056648 . Mine also broke and i stuck a regular t-fitting on there with no problems that i noticed but the part is real cheap, like 4 bucks so i opted to just get another and throw it on instead of using the reg t-fitting

 

It's a check valve. It is NOT the heater control valve. Although, the heater control valve looks somewhat like that, except about 8 times bigger than that check valve.

There's usually one in the line that goes to the AIR diverter valve. I'm not completely sure why the one you have, by the firewall, is there. You can see one in this diagram, down at the lower left corner.

 

Ok were getting somewhere. That is actually not my car just a good clear picture of the valve I broke. So this is a check valve. Sounds pretty generic, how would I ask for that at a parts store if I just say check valve there going to ask for what?

While I have some of the brightest on this boards attention I have two other questions regarding possible vacuum lines.

1. The EGR solenoid, theres a hose coming off the EGR and going to the solenoid, looks like theres a fitting coming straight out the back side from where you plug this hose. I know one tube also runs off the solenoid to under the throttle body, this one I am refering to looks like a nipple coming out the back directly inline with the EGR hose. I don't feel a vacuum off it so just wondering.

2. The air canister left front passenger side, you got the two hoses that run to throttle body, There is also one other hose leading somewhere but thats not the question, there is one nipple on top that says "AIR" is this just for bringing in fresh air and should be open or is there supposed to be a hose running somewhere.

PS: That diagram doesn't work for me I have TPI, I also have the vac routing diagram but it does not show any hoses for these two nipples I am asking about, so I don't think there part of the Vac system but they sure look like they were made for a hose to connect to so I am curious.

 

Is this on a 2.8L, if it is there is a third vacuum line that comes off the solenoid to the EGR vacuum dianostic switch which is mounted on the EGR vacuum control assembly.

EDIT: okay, I thought you were still on the other car. Alright as you will notice the picture has changed now to the one in your car. The little nipple in the back is a vent line and does not have line going to it. There is normally a metal clip and piece of foam rubber on it.

 

I have 5.7TPI, same as in sig. My EGR solenoid looks slight different more square, but it is that hose that comes directly from the EGR to solenoid that then has a nipple coming straight out the back of it. Maybe at lunch I will run home and snap a photo of both nipples I am refering to. the EGR as well as emissions canister.

 

Here is a basic diagram of my vacuum routing, it does not show any hoses coming out of the EGR solenoid just the two that go to EGR and throttle body yet I do have what appears to be a nipple there I will show later in a pic. The air cannister I also have the two hose coming out to throttle body, and the other I was refering to I guess goes to tank? Then there is a nipple at top of cannister that says "AIR" is this just open.

I know this does not show all vacuum ports like the brake booster to pelnum and such, and is more for emmisions routing but I don't think theres much more outside of cruise control, and booster to the vacuum routing.

 

The nipple marked "AIR" on the canister is open and does not have a hose to it because it is a vent for the canister. Mine has a little cover over it to prevent any unwanted inhabitants taking up residence in it. Please note my updated post on the EGR valve.

 

Thats it Trickster, now you see on the EGR solenoid the top hose connection (which is the one that runs to EGR) has a tube that runs straight back, it would appear goes to nothing, just want to be sure because it looks like a hose could go on there and I could swear it had a hole in it (but I could be wrong) was tough to see back side of it.

 

weird also that EGR diagnostic temp switch in that shot has a T in it with what looks like a hose fitting, mine was just a wire that plugged into a female connector up near drivers side firewall.

 

That "T" in that shot is just a plastic connector to hold it to the fuel rail so it won't flop around all over the place. Just follow that broken line from it down to the clamp that holds the fuel line to the rail and you will see it. The fitting on your's might be missing or you have just never noticed it.

 

Oh yeah the little clear/white plastic clip, I remember that now, Mine was broke when I pulled it apart so I just tossed it. Ok thanks bunches Trickster:yourock: . That answered my two questions about open nipples with no hoses coming out of them. So tonight I will try and nail down my timing, I am running a little rough after reassembly of the intake, I am pretty sure all my vac lines are correct and I did not miss anything now, so I must have knocked my timing out slightly. Heres a quick peek of how its coming together, will post more when complete and cleaned up.