View Full Version : Valve cover breather
Laloosh
12-30-2005, 01:15 AM
I have the airaid intake system on my 05 TB. I kinda wanna get rid of the silencer and just want to remove the silecer and slide the airaid up tot he throttle body. Now the silencer as we all know has a vacum hose going to the valve cover. Would i do any harm if i replace that hose with a little breather filter? Or if some1 wants to trade heads up, airaid for a k&n silencer less cai, im game, cause it would save me the trouble. Neway let me know guys thanks
Laloosh
12-31-2005, 12:07 AM
anybody on this board at all?
Trailblazin
12-31-2005, 09:04 AM
there are two vents which u will need to clear up. theres the vacumm hose and crank case breather. With the crank case heater it is ok to add one of those small KN filter breathers, but for the vacuum hose, im not sure if it would be a good idea, u would need some one else to reply to this
ieatglue
12-31-2005, 11:40 AM
http://i30.photobucket.com/albums/c313/rawad_db20/Intake.jpg
The crank breather has a mini-filter on it, but notice how the vacuum is connected to that thing sticking out of the black box. So i guess you can do it that way, but i'm not 100% sure :undecided
tblazed
12-31-2005, 12:17 PM
That certainly is one heavily modded Trailblazer!
One thing about that crankcase air filter setup... that open filter would get you failed immediately during the emissions inspection where I live.
Another thing I see might be an issue is during WOT and high RPM the crankcase pressure can build up greater than the PCV can pull oil fumes and blowby into the intake manifold, and at this same time at WOT intake manifold vacuum is minimum so there may be some oily fumes and gasses blown back out through that filter. The same oil fumes that can build up on the throttle plate in the normally closed PCV system. Just an observation. Have seen happen that in similar applications.
Laloosh
12-31-2005, 04:11 PM
well i did it, but put it back to the way it was. The truck ran and sounded mean. But theres a couple issues that need to be adressed when doing this with an airaid intake. The coupler that goes around the throttle body and intake tube is too fat and touches one of the cooling vents on the coils. The next issues is that big fat hoes that connects to the intake, when u slide the entire intake towards the throttle body, that hos gets rubbed against a hot metal container, no good. O well, it kept me busy for 30 min lol
the roadie
12-31-2005, 05:51 PM
...that big fat hoes that connects to the intake...that hos gets rubbed against a hot...O well, it kept me busy for 30 min lol
Hey! Watch yo mouth! This is a family board. Don't know when the kidz are going to be reading!:rotfl: :rotfl: :rotfl:
Laloosh
01-01-2006, 02:19 AM
lol perverts
Dacomputernerd
01-01-2006, 02:06 PM
lol perverts
:laugh:
ieatglue
02-20-2006, 11:54 PM
Didn't think I want to start a new thread, but there's nothing connected to the black nub sticking out of the plastic part connected to the throttle body. When i was waiting for the bumper to dry, i took a peek and found a tube that wasn't connected to anything. It looks as if it should be connected to the nub. I followed the tube to begind the AC where i lost it. Here's a pic. Should i connect it? (my engine needs a scrubbin')
http://i30.photobucket.com/albums/c313/rawad_db20/CopyofHPIM0719.jpg
Ddubb
02-21-2006, 01:45 AM
I have the airaid intake system on my 05 TB. I kinda wanna get rid of the silencer and just want to remove the silecer and slide the airaid up tot he throttle body. Now the silencer as we all know has a vacum hose going to the valve cover. Would i do any harm if i replace that hose with a little breather filter? Or if some1 wants to trade heads up, airaid for a k&n silencer less cai, im game, cause it would save me the trouble. Neway let me know guys thanks
I would Not recommend modifying the crankcase ventilation system by replacing the vacuum line with an open element breather.
It may look cool on some rice rockets or is more beneficial on some older engines, but most vehicles today actually need to run the way the factory system was designed.
Not to mention, you will not pass smog - the PCV system is an emissions standard.
Im not 100% sure that the I6 engine has a PCV valve as I havent really looked at my own engine in detail, but I have read from others here that it does not have the PCV Valve. It Does however have a PCV system - PCV = Positive Crankcase Ventilation.
What this means is that normally, your PCV valve would be opened by either Negative pressure ( vacuum from the Intake manifold which would open the PCV valve and suck air from the crankcase ) or Positive Crankcase pressure, which would be relieved into the intake system.
On a vehicle with a MAF meter, this could affect your Air/Fuel ratio and cause poor performance. ( 06 Models I know have the MAF, previous years Ive read do not, but Im not sure on the cutoff date ) .. As the PCV system is part of the "metered" air that enters into the Intake, if you allow unmetered Air into the Intake system, it will change your Air/Fuel Ratio, most likely causing a Lean mixture and poor performance.
You would only need to modify this under certain circumstances, such as in High performance applications, High compression engines with Low tension oil control rings, or in engines with Poor ring seals and substantial blowby - You dont want excessive Oil entering into your Intake system.
If you are going to modify your PCV System for performance reasons, it must be done correctly. So if you dont have any idea what Im talking about or how the system works, dont go changing it by sticking a Breather on the Valve cover just because it looks cool. But its your engine, so do what you want with it. :m2:
- Dan
Ddubb
02-21-2006, 01:58 AM
Didn't think I want to start a new thread, but there's nothing connected to the black nub sticking out of the plastic part connected to the throttle body. When i was waiting for the bumper to dry, i took a peek and found a tube that wasn't connected to anything. It looks as if it should be connected to the nub. I followed the tube to begind the AC where i lost it. Here's a pic. Should i connect it? (my engine needs a scrubbin')
If your engine idle is surging or erratic, you have a vacuum leak and should re-connect the vacuum line. Or if your AC is not operating properly ( the opening and closing of the vents behind the dash ) .. your AC uses the vacuum line for this reason. If everything works properly, it probably doesnt goto anything.
Does the Nub on the intake tube have a hole in it, or is it just a nub ? It may be there for other applications, but if yours is non functional, it wont do anything. If the vacuum line came off be sure to reconnect it.
There is a vacuum line diagram on your emissions label under the hood. You can use this to diagnose which vacuum lines go to what. So if yours doesnt have anything, dont worry about the line.
- Dan
also if u replace it with a breather ull get a loud whistle. You need to reconnect it like in the picture.
ScarabEpic22
02-21-2006, 04:10 AM
Glue, there is nothing connected to that on my I6 either, but I have a cap over it that resembles a eraser (that you put on the end of your pencil after the eraser is gone) that seals it off. It is black, and has been there since day 1, so unless there is a hole in there, dont worry.
Prey521
02-21-2006, 09:15 AM
Those breathers are junk and are purely for show. I've read instances where people have failed emissions because of them, don't bother. But since you stated that it's for the valve cover, it doesn't matter, you won't see any performance gains from it though...will just look pretty! :D
ieatglue
02-21-2006, 10:39 AM
I found that hose under one of the spark plug wires and it bends right towards the nub. I'm gonna connect it anyway and if the engine light goes on, i'll just remove it :D
Mada123
02-25-2006, 02:22 PM
http://i30.photobucket.com/albums/c313/rawad_db20/Intake.jpg
The crank breather has a mini-filter on it, but notice how the vacuum is connected to that thing sticking out of the black box. So i guess you can do it that way, but i'm not 100% sure :undecided
So is it bad the put a filter there?:confused: :confused:
What if you ran a line to the intake tube? would it be the same as stock just without the box? :worried:
I'm not talking about the vac tube I'm leaving my just how it is... with the nub.
Ddubb
02-25-2006, 06:12 PM
So is it bad the put a filter there?:confused: :confused:
What if you ran a line to the intake tube? would it be the same as stock just without the box? :worried:
I'm not talking about the vac tube I'm leaving my just how it is... with the nub.
I explained the situations a little higher up where it may be okay to use the open element breather. Basically, if this vehicle has a MAF (05/06?), this can be bad. If there is no MAF ( 02-04 I believe), its okay but not really necessary .. you wont have any benefits except for the $$ spent, the need to clean your filter, and it might look cool to some people.
If you use an intake tube like the one above, you would want to run a line to the intake tube, it would be the same as the factory system. In the pictured case, I think they just used the breather for a cleaner apperance, not for any performance or beneficial reasons.
- Dan
Mada123
02-25-2006, 06:44 PM
...If you use an intake tube like the one above, you would want to run a line to the intake tube, it would be the same as the factory system. ...
- Dan
Ok Thanks Dan for clearing up my confusion.
That's what I want to do but I wasn't sure if there would be a problem.
I don't want to put a filter there ... just something else to clean.... Thank You :D :hail: