Anybody care to fill me in on what the lines are in the pic and have any idea why they are disconnected , engine is running,... but its hard to say wether its idling right or what not as it has a header leak I need to fix anyway.

 

Second pic is heater diverter valve - when heat controls are in cool setting, this valve is closed which keeps hot coolant from entering the heater core - when you change to warm settings vacuum is sent opening this valve allowing hot coolant to circulate through heater core.

 

In the first photo... The disconnected large hose goes to the diverter valve in the second picture, which appears to be broken. The little hose in the first picture looks to be the hose that goes from the MAP sensor to... I forget, a check valve maybe. That is a vaccuum hose. The MAP sensor is just to the left of your hand/runners in the first photo. It should connect underneath the sensor somewhere. A picture or 3 of that area could better show me what's going on over there and see if you even have the check valve and other hoses still.

By the looks of things, it looks like someone has bypassed some stuff. The heater valve in general is a piece of garbage, but I do like to keep mine in working condition. It looks like the hose heading out towards the front goes... somewhere. So at the least, the coolant bypass under the throttle body has been bypassed. That valve just looks weird on the side with no hose. Like a piece is missing or melted or something. Oh, I see now, it's that sticker I get on all my replacements. Nevermind, prolly functioning perfectly. But the disconnected hose in the first picture originally went to the valve where the long hose at the top of the picture now is. Since it's bypassed, I wouldn't worry about it. To the best of my knowledge, it's designed to help heat the water up when its cold out by running it to a plate under and attached to the throttle body.

In the first photo... I'd guess that piece fell off. I'd also guess that the tap on one end was to try and seal off the hose and prevent vacuum leaks. Without a good look at that area, including where the EGR valve is underneath the rear of the plenum, I couldn't tell you if its just broken or disconnected. But at a minimum, if that hose was taped to prevent a vacuum leak, reconnecting it and properly sealing it could straighten out your idle.

 

Thanks everyone ,

Im gonna take some more pics for you, I think I know where you need to see and maybe I can get them hooked back up and sealed. Planning on buying an assembly manual but just got her dropped off 2 days ago. Like i said there's a header leak and the trannys 3-4 pack is shot so she aint goin' nowhere for awhile, Degreased the engine area when I was taken those pics so I can see leaks if any I plan on workin on the engine while I save to get the tranny rebuilt.Again thanks I'll post some more pics when I get off work.

 

Sorry I didnt get them up sooner, took some more pics of the engine first one is other side, second is where the two lines in question originate through the firewall it looks like, third is where more lines like the two disco'd ones are hooked up

 

Here's another pic from the other side where something appears to be missing Ordered the shop manual yesterday should be here in a few days.

 

What's missing in the last picture is a piece of metal or plastic. It's a cover. The original one was plastic, and I hated it, so I ordered the Corvette version which is metal. So now that plastic cover is sitting in my storeroom. lol. You have an 89 I see, and it looks like you have MAF, so you shouldn't have the MAP sensor that I mentioned before. The MAP sensor, in 90+ models is attached about where the 2 hoses go into the plenum in the 3rd picture. The short hose that plugs into the plenum and the EGR valve under the plenum is about what I thought that other disconnected short hose should be. So right now, I'm not certain where that one goes.

You definately seem to have some repair or bypass work going on with those wires in picture two.

If you want the replace that missing plastic/metal piece, you can order one fron TPIparts.net. I could also sell you my old plastic one, cept it's not shiny new. lol It also looks like you're missing one of the screws for the nameplate at the top front of the plenum.

 

I kinda figured the hoses would be a mystery as i saw the other similar hose hooked up and none were missing. Thanks for the info on the plate I'll order a nice one. My shop manual should be here in a few days hopefully. It'll give me some incite as to what the hoses are for. I know that pluging them with my fingers evens my idle right out though.

 

Ok got my shop manual and have pretty much deduced that the shorter hose that orginates from what I think is the solinoid goes to the EGR valve as it doesnt have its vacum line connected. The hose is the taped off one with an L shaped end or "fitting" if you will. Im pretty sure this is it it just looks awkward like that.Anybody know if this is right? The other Line is still a mystery it comes up through the firewall and is bundled with the A/C wiring harnes it looks like.Narrowed it down to A/C, or cruise control as the Cruise vacume line looks kinda wonky as campared to the manual.

 

There is a vacuum line that goes to the AC controls in the car. Maybe that's it? Also, if the EGR valve doesn't have a vacuum line going to it anymore, the valve is nonfunctional as it needs that vacuum line to open and close the valve. If I read what you said right... Dunno if that valve being disconnected is intentional or not. I suppose you could replace the EGR valve and reconnect the line to it. Replacing the valve would just be a good idea being that it has been disconnected, may have had a problem to warrant it being disconnected in the first place and its just, well, old. It's always a pain trying to figure out why a previous owner bypassed or disconnected something and whether you should fix what they did or not.

 

I think Ive got the vacum lines figured out but I've still not quite understanding the heater valve assembly completely, mainly because of one hose Basically Ive got one left over and I'm not sure where it goes. Picture attached one with and one without questions.

 

That hose is the bypass hose. It can go in the garbage. you'll want a special U shaped hose that goes from the connection on the engine to the coolant plate under the throttle body. You should have most of that info in the message I sent you. The coolant plate I found also. I can draw the hose on the picture you put up if you like, show you exactly. Let me know.

 

Ok got the stuff I needed and got the throttle body off and cleaned good. With a little help from my old man ,who I might add is a machinist and a friggin genious, got the coolant plate off the throttle body (3 of the bolts were not removeable through conventional means). It dosent look bad dont think I'll replace it have to see if it leaks. Just gotta wait for new screws and gaskets to come in .Cleaned my MAF sensor good, Used appropriate C&C's aresols for all.Tryin to get the plenum off so I can change the EGR valve and the last torx screw wont come out. Pops is comin over tomorrow with an easy out and some other stuff to get it out. Think once Ive got the Plenum off I'll go ahead and get other stuff changed, cleaned,or serviced. Injectors ,plugs, pull the valve covers, etc.