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COMPLETE REDO of PCV System(pics writeup)

This is a discussion on COMPLETE REDO of PCV System(pics writeup) within the General Help forums, part of the LSx Technical Help Section category; There is another line that goes from the top of the tb to the front of the valve cover. The ...

  1. #21
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    There is another line that goes from the top of the tb to the front of the valve cover.
    The PCV system goes to the intake to the merge then to both valve covers. At 6'4 and 230 lbs I can fit back there. You should be able too.

  2. #22
    Member TedsB4Csled's Avatar
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    Got it. I'll get back under the hood when it warms up a bit. Thanks.

  3. #23
    Member TedsB4Csled's Avatar
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    Me again!

    Me again! I can't get to it, I should have mentioned I'm in a wheelchair. I actually work on everyone else's cars around here so they are clueless. I need to get the car to the garage. I connected the TB line to the other line just above it (the one that used to be connected to the front of the passenger side valve cover), now the car idles real high without the pcv valve between them. Can I drive it about 5 miles without any problems? Thanks for all your help, and Happy Holidays!

  4. #24
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    79 T/A -91 Firebird
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    Should be fine. Just might throw a few codes and run lean... no WOT runs lol.

    Didnt know about the wheelchair btw

  5. #25
    Member TedsB4Csled's Avatar
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    Quote Originally Posted by JoshieDoom View Post

    Didnt know about the wheelchair btw
    It's ok, I still get under the hood/car pretty well. My neighbors think I'm nuts!

  6. #26
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    what does the pcv line connect to in the back?

  7. #27
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    what does the pcv line connect to in the back? is it hard to disconnected?

  8. #28
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    Quote Originally Posted by Dannyws6 View Post
    what does the pcv line connect to in the back? is it hard to disconnected?
    The PCV line runs back along the right valve cover, then turns and goes across the back of the engine, and plugs into the back of the left valve cover.
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  9. #29
    Yo Da Lin The Valley..... astyles's Avatar
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    Quote Originally Posted by TedsB4Csled View Post
    I am in the process of replacing the PCV hoses on a 2002. I can't get my hands to the back of the intake manifold to attach the other side of the hose. The PCV valve to TB is fine, and a new hose runs towards the back on the pass side then disappears. A friend said he got the other side in, but the car miss fires now. WTF? Do I need to take some parts out of the way? How the f*** do you get to it?????????
    i just pulled mine off the driverside valve cover and ran the 2 rear ones into one then up to the catch can

  10. #30
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    My pcv valve issues...

    I just picked up my camaro ss yesterday, and it is in excellent condition. The only thing I noticed after my 3 hour drive home was there was whats now known to me as the pvc valve is all cracked up and splattering fluid over my motor. I talked to the dealer and they said gm dont sell just the piece that cracked. what do I do>? the guy at autozone actually broke the thing all the way off before it was just rotted and fixing to break. it hasnt turned on my check engine light as of now? Any help would be greatly appreciated

  11. #31
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    by the way its all cracked up in the rubber piece about 4 inches away from the throttle body. BTW... this is the stupidest pcv set up ive ever seen in my life!

  12. #32
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    79 T/A -91 Firebird
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    Just follow the redo steps. You can replace it all very very easily.

  13. #33
    Member DaddySS's Avatar
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    fyi, the oem complete assembly including hoses and PCV - 12590632 - is available for about $80 for those of you interested.

  14. #34
    TunedbyFrost.com Tuner Frost's Avatar
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    you NEED an oil trap... buy a cheap Harbor Freight air tool water trap, two screw in barbs from HF also, follow the arrow on top for flow. You should see what the tops of the pistons look like from the oil that gets sucked into the engines even when stock.

    Here's an example AFTER going over them with a rubber fingered pad on an air tool; this engine had about 55-60K miles:

  15. #35
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    79 T/A -91 Firebird
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    Most every engine ive took apart even with a breather system still looks like this. Poor quality fuel/ burnt carbon has to do with most of it IMO

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    these engine from the factory are tuned so rich it amazing they last so long.you can buy a oil trap also from home depot for 15$.

  17. #37
    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by JoshieDoom View Post
    Most every engine ive took apart even with a breather system still looks like this. Poor quality fuel/ burnt carbon has to do with most of it IMO
    Of course they will, but I'm not talking about a breather. The buildup on these pistons is NOT fuel related. It's from the OEM PCV. When setup properly from the beginning on new shortblocks, they never get this. The trap works and it is very much needed. Your propensity to knock is reduced with the oil vapor out; that's enough reason alone to use a trap.

  18. #38
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    just when i think i got everything covered something else comes up. ok, i got the whole thing with the catch can between the pcv and intake, lines off the back of both valve covers going to the pcv, what do you do with the line straight from the front of pass. valve cover into the throttle body? if i cap off the throttle body port and put a breather somewhere for the valve cover the smog police arent going to be happy. if you are pulling from both valve covers into the intake tract, what do you need the line to the throttle body for and why doesnt it need to be from both valve covers? maybe i should have put this in a catch can thread.
    Last edited by dklowrider; 07-13-2009 at 08:07 PM.

  19. #39
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    Been lurking on this thread since I'm about to hook up my lines on my LS1 conversion. I noticed that my passenger side valve cover does NOT have a port in the back of it. I have been told that this is a newer style valve cover.





    What is the best way I should route the PCV system? I am paranoid about venting the crankcase pressure. Thanks for any help/advice.

  20. #40
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    Quote Originally Posted by demonpixel View Post
    Been lurking on this thread since I'm about to hook up my lines on my LS1 conversion. I noticed that my passenger side valve cover does NOT have a port in the back of it. I have been told that this is a newer style valve cover.

    Click for full size

    Click for full size

    What is the best way I should route the PCV system? I am paranoid about venting the crankcase pressure. Thanks for any help/advice.
    No doubt about it, the LS6 style PCV system is the best option. Instead of pulling vacuum on the valve covers where there is constant oil flow from the valvetrain, the LS6 style pulls from the valley, which is where a lot of crankcase vapors accumulate, but there is little to no oil in that area. This results in much lower oil consumption, and better evacuation of crankcase vapors. You can also get the newer style (L92 maybe?) LS6 valley cover, which has a fixed orfice design, and doesn't need a PCV hose or PCV valve. Just run a regular 3/8" hose from the port on the valley to your intake, and you're done.

    With your engine in its current state, the LS6 PCV system install is a breeze. Just order the cover from GM Parts Direct (its around $55 and comes with the gasket). The part number is 12577927 for the newer style cover with the fixed orfice, thats the one that I used on my conversion. You may have to grind part of the inside of the valley down for cover clearance, since the newer blocks don't have the casting piece on the front left side of the valley that the LS1 blocks have. Other than that though its a direct bolt on.

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