Vacuum Lines - Where to

[AjWit]

Ok guys and gals, i want to buy this 92 awd laser, it has a severe idle issue, it will stall if you dont give it gas, but runs like a mean son of a gun when driving. These are the two vacuum problems that i found while looking it over, hopefully you can see in the pic what i'm talking about. The one on the top of the pic, left side of engine is just the metal connector going to nowhere, the other also comes off the valve cover and the hose leads to nowhere as well. Any help on where those go, cant i put a breather on one.

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[jwm1632]

The nipple over top of the thermostat in stock form goes to the intake before the turbo. This is bad to do because it puts a lot of oil deposits in you intake and intercooler piping. The best thing to do is put a catch can on it or just attach a long vacuum hose going straight down past the engine. The nipple on the back of the valve cover needs to be attached to the intake manifold. It has a check ball valve and is also used for a breather.

 

[95GSXCO]

The one on the backside of the VC will go onto the intake manifold. The one on the side should go into the intake tube in between the MAS and turbo.

 

[95GSXCO]

The nipple over top of the thermostat in stock form goes to the intake before the turbo. This is bad to do because it puts a lot of oil deposits in you intake and intercooler piping. The best thing to do is put a catch can on it or just attach a long vacuum hose going straight down past the engine. The nipple on the back of the valve cover needs to be attached to the intake manifold. It has a check ball valve and is also used for a breather.

You dont want the hose to go down to the ground. You will want to put it back into the intake tube. To stop the oil from getting into your turbo put a little fuel filter inline.http://www.dsmtuners.com/forums/newbie-forum/280613-did-i-do-fuel-filter-catch-can-mod-correct.html

 

[Johng322]

The hose on the top of your picture is the valve cover breather hose that lets fresh air into the valve cover. The one on the right of your picture is the PCV valve which is designed to let any vapors or gases in the valve cover escape. It is a one-way valve that doesn't draw air in but lets air escape. The PCV valve is typically routed into the intake manifold so it will see negative pressures and can draw the air out, this doesn't happen when boosting obviously. The metal connector coming from the side of the valve cover just lets fresh air in and is usually attached to the intake pipe. These can also be routed into a catch can setup so that the oil vapors can't get into the intake.

 

[AWD-TSI]

you can put a catch can on it. The big one goin towards the intake mani. is your PVC valve it relives crank case presure. That Vaccum line that is just hangin out next to it the pvc is the one that connects to it. the other one usually connects to you intake after the MAS.

 

[AjWit]

Would either of these or both cause my idle to be soo bad, i really do mean that the car stalls if you dont give it a little gas, and will continue to try and stall even after you've been driving it. Thank you.

 

[95GSXCO]

Yes it will if the pipe on the intake where the hose on the back of the VC is open it is taking in unmetered air and also letting alot of air out. So put them where they go and it will idle better and WOT will be alot better too.

 

[cheap90gsx]

Off topic, but how much are you going to pay for it?

 

[brownfinger]

Would either of these or both cause my idle to be soo bad, i really do mean that the car stalls if you dont give it a little gas, and will continue to try and stall even after you've been driving it. Thank you.

Hell yes it will! It's nothing but a big ole' vacuum leak. A big one. I've never owned a turbo, but it's also a huge boost leak, too. The one on the side, which should hook-up to the intake duct, may need to have a nipple added to the intake pipe for a place to hook it up. Just reconnect the hose to the IM, then cap the other one, then try to start it. I bet it will idle. You won't have a PCV system like that, and it will be super-rich untill the fuel trims reset, but it should run a lot better then.
BTW, the nipple on the manifold is way down there, between some injectors. If it is already capped, the car has other problems.

 

[AjWit]

cheap90gsx: $1000

95GSXco and brownfinger: thank you for the input, i'll get that hooked up and hope all is better.

The car has a boost, a/f, and water temp gauges in it, all work. A/f says stoich at wot through the rpm's, boost goes to 12, then a small touch to 15 at high rpm's, water temp is ok.

Does anyone know where that PCV hose in the pic actually goes to on the intake mani? I'm not anywhere near the car to check. It has impressions of a hose clamp on the end of it but i don't see anything near it to connect it to. thanks again.

 

[fergulus]

The line coming off the back (from the PCV valve) has a very small hose, as shown on your own picture. It will be plugged into the top of the intake manifold runners, which is underneath your fuel rail. Just move the wiring harness around, and you should see a vacuum nipple with no hose attached

 

[brownfinger]

That rubber hose sticking up off of the VC in your picture is the PCV hose. Rotate it about 100degrees clockwise. While you do this, thread it in between the fuel rail, the injectors, and the wiring. After you do all of that, the end of the hose should be sitting near a nipple sticking out of the intake manifold. Stick the hose onto that nipple. Then you are half way to fixing the vacuum leak. There is then the other nipple. Either cap it, or hook it up to the intake pipe. I'm not a turbo owner. I THINK it goes after the MAF, before the turbo. If there isn't a nipple there for it, just cap the nipple on the VC to see if it fixes the idle. If you buy the car, add a nipple in the correct location.