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  1. #1
    Senior Member pecha's Avatar
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    98 WS6

    What do you call this part?

    Can you please help?



    It's in the back of the engine.

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/ mods, 00 FBVert

    egr tube.

  3. #3
    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/ mods, 00 FBVert

    You can delete it, cap the 2 back ports and run a catch can and have better results. IIRC a tune to remove the CEL code too.

  4. #4
    Senior Member pecha's Avatar
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    98 WS6

    Quote Originally Posted by SMWS6TA View Post
    You can delete it, cap the 2 back ports and run a catch can and have better results. IIRC a tune to remove the CEL code too.
    any place in the forum that explains this mod for 98 T/A?
    Click for full size

  5. #5
    expensive tires az gt eater's Avatar
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    Quote Originally Posted by pecha View Post
    Can you please help?

    Click for full size

    It's in the back of the engine.
    That looks like the last half of the PCV system. I may be wrong as I own an 01, but that is what my PCV system looks like..

  6. #6
    Senior Member 98TransAmWs-6's Avatar
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    98 TA WS6/ 01 C5 Corvette

    It's part of the pcv hose that hooks to the back of the intake. That is exactly what mine looked like when I replaced mine before changing my pcv setup.
    1998 Trans Am WS6 - Phantom
    421 CI LQ9, Tick Performance Custom Cam, TFS 255cc LS3 heads, Kooks 2" LT headers, Kooks 3" True Duals w/ high flow cats, FTP 104 lid, Speed Density Tune, 4" silicon tube, LS6 VCT, FAST 102 Intake, NW 102 TB, Oil Catch Can, SLP Bilstein Shocks w/ Vogtland Springs, CTS-V 4-piston Calipers w/C6 Z06 rotors, Stainless Steel Brake Lines, R1 concepts premium rotors, Hawk HP+ brake pads, VFN WSQ Hood, C5-R timing chain, SLP oil pump, E85 tune, Walbro 450 fuel pump, Deatschwerkz 95# injectors, Breathless performance headlights, Frost Tune, !HVAC.
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  7. #7
    Member 1998 T/A's Avatar
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    2000 WS6 Trans AM

    That is not a an egr tube..that is a piece of the PCV. It should go from one valve cover to the other then up to the throttle body...brand new gm part on amazon for 89 bucks. I just had to replace one.
    98' Trans AM RIP

    00' WS6/Black/Pacesetter LT's/Magnaflow Exhaust/SLP lid/Nick Williams 92mm TB/FAST 92 Intake/BMR Strut Tower Brace/BMR Rear LCA's/BMR Panhard Bar

  8. #8
    Member 1998 T/A's Avatar
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    2000 WS6 Trans AM

    By the way do not cap those on the rear of the valve cover...install a catch can if you're concerned with oil making it back into the throttle body

  9. #9
    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/ mods, 00 FBVert

    What do you call this part?

    yeah I was quick on that one...but regarding the ports & catch can.... yes you can cap the 2 rear ports on the valve covers. The front port on pass side then needs to connects to a catch can then on into the throttle body.


    Mine has been setup this way going on 5 yrs now.
    http://www.ls1.com/forums/f7/my-6-liter-build-174257/

    http://www.ls1.com/forums/f8/my-8-8-rear-build-165553/

    6.0L Block - Forged 403ci , Polluter Stg3 Cam, FAST 102mm Intake, NW102 TB, MSD wires, NGK TR6 plugs, Truck Coil Packs, LS3 Fuel Injectors, CC Pacesetter LT Headers, TS&P ORY, QTP e-Cutout, Magnaflow Muffler, 104mm Air Lid & Line Lock, Catch Can, Stage 2 T56 w/Viper shaft, PRO 5.0 Shifter, Tick MC, SPEC Stg3+ Clutch, QT SFI BH, MWC DSL, Full UMI Performance Suspension, Belstein Shocks, Hotchkis Springs (1" Drop), YR1 Snowflake Wheels wrapped in NT555 tires & Custom Fab Ford 8.8 rear w/Wavetrac Diff 3.73 Yukon Gears, WSQ Hood, 3"CM Strange Eng Drive Shaft.

    00 FB Vert - Stock

    78 FB - Just getting started......

    Horsepower never lies, but is often lied about!

  10. #10
    Senior Member pecha's Avatar
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    98 WS6

    well the tubing is fine on my car, I just need to replace the valves.
    Is this the right part???
    More Information for FRAM FV391

  11. #11
    Veteran pajeff02's Avatar
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    There is only one "valve" and that is located in the hose on the front passenger side of the intake.

  12. #12
    Member 1998 T/A's Avatar
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    2000 WS6 Trans AM

    Google gm ls1 pcv and in images there is a good disgram. It comes up as first image. Then find the part number and order it the pcv does not come in separate pieces it is all one unit. To avoid future vacuum leaks buy the stock unit and don't try to patch up your current one

  13. #13
    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/ mods, 00 FBVert

    Sean if that pic is of yours then the hoses are not good.

    The plastic lines in the back merge into a y type connector in the back. In your pic it looks like it broke off. The PCV is a separate part that is changeable, but again those hoses are all dry rotted. Thomas is right in ordering the whole unit IF you're going to replace it as is.


    Here is the sticky to make it yourself if time is an issue.

    http://www.ls1.com/forums/f6/pcv-val...ication-80151/


    Here are the part number for the hose assembly 12590632. GMpartsdirect.com has it for $76.99 plus handling charge. Not sure if they will ship it overseas.
    Last edited by SMWS6TA; 04-21-2015 at 06:30 AM.

  14. #14
    Senior Member 98TransAmWs-6's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    Sean if that pic is of yours then the hoses are not good.

    The plastic lines in the back merge into a y type connector in the back. In your pic it looks like it broke off. The PCV is a separate part that is changeable, but again those hoses are all dry rotted. Thomas is right in ordering the whole unit IF you're going to replace it as is.


    Here is the sticky to make it yourself if time is an issue.

    http://www.ls1.com/forums/f6/pcv-val...ication-80151/


    Here are the part number for the hose assembly 12590632. GMpartsdirect.com has it for $76.99 plus handling charge. Not sure if they will ship it overseas.
    ^agreed. I would just replace the whole hose. Mine was cracked and was causing my engine to misfire and upon replacing it it fixed the issue.

  15. #15
    Senior Member kingls1's Avatar
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    Or you could fix it with a better system that works way better, a little more work but this PCV is a way better set up. http://www.ls1.com/forums/f63/ls6-va...r-pics-145557/
    99 Trans Am, SLP Lid, Blackwing filter, smooth bellow, Ported TB, LS6 intake, Ws6 lower ram air box, OBX LT's, Magna Flow cat back, LS7 clutch, Tick MC, Hurst Shifter, Frost Tune, UMI SFC,LAC, STB, PB, Torq Arm, Super Hawk hood, Torq Thrust II, Kee Audio.
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  16. #16
    Senior Member pecha's Avatar
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    98 WS6

    Quote Originally Posted by SMWS6TA View Post
    Sean if that pic is of yours then the hoses are not good.

    The plastic lines in the back merge into a y type connector in the back. In your pic it looks like it broke off. The PCV is a separate part that is changeable, but again those hoses are all dry rotted. Thomas is right in ordering the whole unit IF you're going to replace it as is.


    Here is the sticky to make it yourself if time is an issue.

    http://www.ls1.com/forums/f6/pcv-val...ication-80151/


    Here are the part number for the hose assembly 12590632. GMpartsdirect.com has it for $76.99 plus handling charge. Not sure if they will ship it overseas.
    I'll probably do just this.
    but
    does assembly # 12590632 include the valve or is it just the hose? Also is it going to fit my 98 T/A?
    The reason I'm asking is cause in some other places (e.g. Chevrolet Corvette Camaro Pontiac Firebird PCV Valve Pipe Hose New 12590632 | eBay) the part is listed as fitting 99-up cars

  17. #17
    Veteran pajeff02's Avatar
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    Here is the assembly, and yes, it includes a new PCV valve:


  18. #18
    Senior Member pecha's Avatar
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    98 WS6

    so does it fit 98 too?

  19. #19
    Spaz is My Mentor SMWS6TA's Avatar
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    yes all 98-02 yrs.

  20. #20
    Senior Member pecha's Avatar
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    98 WS6

    hmm
    I researched a little bit more online and seems like some sources give a different part for 98:
    98-2002 Camaro/Firebird LS1 PCV Hose System - Hawks Third Generation
    or
    GMPartsDirect.com - Find a Item
    I'll be at the garage tomorrow and look closer at the broken part

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