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Vacuum Help!

YoungMoneyVII

YoungMoneyVII

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New to K5s. I have a 1990 K5 with a 5.7. Have a Loose vacuum line in the engine bay and am hoping you guys can point me in the right direction.

I have this line that comes out of under the light in the firewall. It does not suck air in. Please help me where find where this goes. On another note my heat doesnt work.





Heres a bit that pokes out of the back of my manifold inbetween the EGR and Ignition Coil and it sucks in air and when I put my finger over it the idle changes. This does not look good. Please help lol.



Does the EGR solenoid have a vent? My emission routing sticker was scuffed and this portion is illegible.

Lastly I have this line near the charcoal canister behind the driver headlight. Looks plugged or like a button below the green wire. Any ideas?

 
top 2 pics...

get rid of the weird loop thing and hook the skinny one up to a vaccum source somewhere. it controls the heater door.

second to last...

that is a MAJOR manifold vacuum port. cap it or hook something up to it. the darker line running up to the back of your TBI may be the hose that goes there:dunno: see if its hooked to something. I think my tranny was hooked to mine on my old truck:thinking:

last pic...

is your front axle vent, its just the way its supposed to be:waytogo:
 
In the top pics, that vacuum line should run from the fitting on the manifold, to a single Tee with the small line going to the heater/AC control, and a line going to the vacuum reservoir mounted next to the brake booster. The reservoir is a round ball looking thing.
 
British Slave said:
In the top pics, that vacuum line should run from the fitting on the manifold, to a single Tee with the small line going to the heater/AC control, and a line going to the vacuum reservoir mounted next to the brake booster. The reservoir is a round ball looking thing.
Click to expand...

Kinda like the ball used for cruise control? And which T should I get rid of? the white one or the black one? Thanks for your help guys I had a feeling this is where they went. I connected the end that looks broken off to the fitting and my heat still didnt work. Wouldnt be surprised if it went to my tranny this car has been ****edd with not the original motor, motor out of a 89. As for the line your speaking of shady it goes into the back of the tbi, feels as if its connected unless it just melted there from heat. Ill bust out the mirror to double check.
 
the "ball" thing he is talking about is located between the fender and brake booster, make sure that is getting vacuum from somewhere. Normally, the hose coming from the firewall in PIC #1, is connected to that ball in some fashion, not directly to the manifold.

Basically, what you are looking for, is a reservoir of vacuum that you can draw off of to run your HVAC vents, as they are vacuum operated. Plug the hose coming off the ball into that manifold nipple, normally there is a T in that line already. PIC #1 hose should go to that T. The little white plastic thing inline is either a filter or check valve, or both.

The vent coming from the front axle just needs to breathe, but not be open to the elements, that "cap" looking thing lets it breathe. You should have one on the rear axle, tranny, and T-case as well.
 
K85 Octane said:
the "ball" thing he is talking about is located between the fender and brake booster, make sure that is getting vacuum from somewhere. Normally, the hose coming from the firewall in PIC #1, is connected to that ball in some fashion, not directly to the manifold.

Basically, what you are looking for, is a reservoir of vacuum that you can draw off of to run your HVAC vents, as they are vacuum operated. Plug the hose coming off the ball into that manifold nipple, normally there is a T in that line already. PIC #1 hose should go to that T. The little white plastic thing inline is either a filter or check valve, or both.

The vent coming from the front axle just needs to breathe, but not be open to the elements, that "cap" looking thing lets it breathe. You should have one on the rear axle, tranny, and T-case as well.
Click to expand...

thanks K85 ill dig my hand in there and see if I can figure it out.
 
Well thanks to you guys I found the wire going from the vacuum resevoir into the cruise control thing was split open on the end which was probably giving me that CEL after harsh driving, old dryrotted line. However the line just goes striaght into the cruise control, no T. and the other line in the cruise control goes to the brake pedal. Im going to delete the cruise control. How should I route the new line and will I still need the resevoir?
 
Hook it up just as I posted above, as far as the extra tee. just get a cap and pluge it. That will give you a source for a vacuum gauge. Get the caps at Auto Zone.

You need the reservoir to keep a steady supply of vacuum to the heater/AC when accelerating.

If you don't want heater/AC. just plug the fitting on the manifold with a cap you get from Auto Zone.
 
British Slave said:
Hook it up just as I posted above, as far as the extra tee. just get a cap and pluge it. That will give you a source for a vacuum gauge. Get the caps at Auto Zone.

You need the reservoir to keep a steady supply of vacuum to the heater/AC when accelerating.

If you don't want heater/AC. just plug the fitting on the manifold with a cap you get from Auto Zone.
Click to expand...

unrelated to CK5's if I deleted the vacuum resevoir out of my 88 5.7 trans am does that mean ill loose good heat flow when accelerating?
 
only thing the reservoir does is help with vacuum demand FOR THE BLENDING DOORS. Nothing more. :)
 
K85 Octane said:
the "ball" thing he is talking about is located between the fender and brake booster, make sure that is getting vacuum from somewhere. Normally, the hose coming from the firewall in PIC #1, is connected to that ball in some fashion, not directly to the manifold.

Basically, what you are looking for, is a reservoir of vacuum that you can draw off of to run your HVAC vents, as they are vacuum operated. Plug the hose coming off the ball into that manifold nipple, normally there is a T in that line already. PIC #1 hose should go to that T. The little white plastic thing inline is either a filter or check valve, or both.

The vent coming from the front axle just needs to breathe, but not be open to the elements, that "cap" looking thing lets it breathe. You should have one on the rear axle, tranny, and T-case as well.
Click to expand...

Octane theirs two lines coming out of the transfer case, guess ones a vent but how about the other one? The vent goes all the way up to the tranny?

 
every resevior ball I've had on a squarebody ive found to leak:dunno: I've disconnected them and never had a issue that I know of. my burb still operates like a champ.
 
shady said:
every resevior ball I've had on a squarebody ive found to leak:dunno: I've disconnected them and never had a issue that I know of. my burb still operates like a champ.
Click to expand...

The one on my trans am was so baked that when I went to take the vacuum line off it just cracked the fitting right off the ball.
 
the blending doors I believe are what tells your heat/ac what holes in the dash to come out of. usually has a tab that breaks off and you have to fix that too:rolleyes: bunch of threads here on how to do that at home:waytogo:
 
okay so pretty much if I remove that ball ill have no control of the blending doors it will just come out of all the doors at the same supply?
 
I havent had any noticeable difference since mine was unhooked
 
shady said:
I havent had any noticeable difference since mine was unhooked
Click to expand...

probably not, it's not a life and death thing
as long as there is vacuum to operate the doors, all it good.
it's just there as a reservoir and it wont affect your transmission any either

YM7: I've never heard of two hoses coming from the T-case. It should just the the breather (which is normally just a stubby vent unless a PO extended the line upwards) The hose and nipple in the picture look like a vent line. The end of it should have another one of those "cap" looking things. :waytogo:
 
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