I'm trying to put my 98 back together after some hvac work. While installing the intake, I have an issue that I think I found while disassembling. Honestly, I can't remember what I did here.

I'm guessing this is some sort of evap solenoid, but, I do not recall it being connected to anything when I took it off. I vaguely remember thinking I'd track down the lines when the intake was off. Of course, now I've got it partly back on and still no lines...

I replaced the line to the hvac, and that is connected to the gizmo on the back of the intake. The brake booster also connects to that same thing.

This on the other hand, I remember disconnecting "A" from the hose shown as B, but I don't recall ever taking anything out of C or D. The two X's are the electrical connection. And, also, I don't recall it being connected to any bracket. Even if there was one, it better be offset about 2" cause where that circled area is on the intake where a bracket could slide in, the part is not going to attach there, it'll be 2" back.

Could anyone please shed light on where connection C and D go? D is an elbow that could be turned any direction from forward to up to back. C really doesn't look like it connects to anything, but I don't know.

Any help much appreciated.




Oh, and additionally, I'm going to steal some images from this thread because they apply to me.
http://forums.corvetteforum.com/c5-t...with-pics.html

Here he shows a pic of the gizmo on the back of the intake. At the bottom of mine where he shows the open fitting, I have an elbow. I connected the hvac cabin vacuum line to that. Is that correct?



Here, he shows a vacuum brake or one way check valve, whatever it is. On my car, there wasn't one of these. Do I need to purchase this? I should also mention, other people have said they got lean messages with a check engine light. I've not had that. If all these lines were open, I'd have thought I'd be getting DTC's up the ying yang. I didn't. I've only owned this car a month, and this is the first time I've really torn into anything engine related.

 

Possibly answering my own question...

I'm thinking that connection D on my photo should go to the connection out the side on the vacuum check valve he shows in the last photo, and then the remaining line on that check valve, should be connected to my cabin line which I now have direct to the manifold.

If that is correct, is that check valve the only part I'm missing? Sadly, I'll have to pull the intake again because I cannot allow this thing to sit opened up till I can get that part.

 

Nobody?

I see I didn't answer anything really, except where that part he shows goes. That goes in the fender well down by the vacuum canister. I didn't even know there was one till I re-read that thread. I picked up that vacuum brake this morning before work, so I've got that to install down there and tie in that tank. But, I still don't know where the C/D connections on that Evap solenoid go. I have my intake back off, and there's no spare lines laying around. Anyone have any pics of that side of the motor which might show that? Or just describe where they go? The service manual doesn't say a thing about where these lines end up. In fact, it doesn't say anything more than 'remove lines', 'replace lines'.

 

The service manual is written in such a way, that assumes the mechanic will not misplace, loose track, or forget where things are connected. Damn GM.....

 

Yea, well, I wasn't the guy who lost/misplaced them. I'm just the guy who wants it back the way it's supposed to be.

 

Very well, perhaps this will help. Nothing connected to the rear port.

 

Thanks!

Yours looks like mine sorta, even has the look like someone tried to tape over that elbow with duct tape! Mine is uglier yet, has more glue on it than yours.

How about the other end of that thing. There's a fitting that has a big flange on the outside of it, almost like it's not intended to have something on it either. I Can't figure what the thing would do with 2 ends open to the atmosphere?? And, why would they stick an elbow on to nowhere? This is crazy. I've looked long and hard and there's no more hoses to hook up. My intake is going back on.

 

The service manual vacuum line diagram for the intake manifold is WORTHLESS. Lucky has the best example so far. Your best bet is to find another 98 and take notes

You can call Gene Culley and see if he has any info on vacuum line routing info.

I had a 98 a long time ago but,,, dont have any pictures for you that you can use.

As for the line on the back of the manifold, Yes the single small nylon line connects to the small fitting. The brake booster to the other.

I will get you some passenger fender vacuum line pics:

BC

 

Thanks Bill,

I used Lucky's pic as a guide and hooked mine back up that way. That's how it was I'm near certain. It's just odd to have 2 openings, one with a elbow, and they go nowhere.

I drove the car home and got no codes, and no odd feel in the way it runs. I guess I should go check to see if there's any codes that didn't throw a dic message. That line at the back of the intake was wide open from the time I've had the car. Now, it's a tiny line, so maybe that didn't cause enough of a vacuum leak to make the car run noticeably bad. It is now connected to the hvac vacuum tank, and all is well and sealed up there. All my doors work , now all I have to do is get a tensioner tomorrow, hook up the belt, charge the system and this will be one gigantic headache out of my way.

I can't wait for the day when washing the car and detailing it is all that needs done.

I think I got that from the mother of all a/c door threads. Thanks all the same. After figuring out I needed to open the fender well, I figured out what I was doing wrong and what that guys notes meant on those pics above. Much of that didn't make sense to me the first couple times I went through it because I kept thinking that valve was up at the top of the intake. Dont' ask why...

As an aside, that little valve only had 2 lines coming from it, one had broken off. After getting it out, I dropped it on the floor and the other two broke off. It didn't shatter, but it gave up a good chance to. I was really surprised that the tank still held pressure. I figured if that valve had rotted that bad, the tank would be eaten to bits, but nope.