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Catch CAN - PCV.

Discussion in 'Engine and Drivetrain' started by JoeJack88, Feb 6, 2007.

  1. JoeJack88

    JoeJack88 Well-Known Member Super Moderator Donated!

    Originally posted by Joel87GT from 4gcelica.net

    The catch can methods is used to catch oil deposits from being recirculated and sludging vacums lines within the intake manifold, intercooler, and Throttle bodies.

    FRAM G3 Fuel Filter faced in wrong direction, it should face the other way.

    Parts Needed:

    Tube clasps.

    1. CUT your PCV in half.

    The fram fuel fitler G3 comes w/ its own clamping glasps to fit the tubing of your PCV hose.

    2. Take equal lengths of each PCV hose and install at each end of the G3. Use clamps that come with G3 kit.

    3. measure and cut the length to accomodate the PCV/G3 between Blow Out Tube from Valve Cover to Throttle body.

    4. Install in proper blow by gases direction indicated on Fuel Filter from Valve Cover to Throttle body.

    5. Finished.


    he result of a CATCH CAN is to keep blow by gases clean from tarred sediments deposits in VC, T/B and Intake Runners ports. Picture of my Valve Cover after 10K miles.

    Conclusion: Your engine will re-breathe at bit better. Improved gas mileage too. All bad emmission deposits will be caught in G3 fuel filter. Replace when you see G3 20% saturated in oil.


    PCV (Positive Crankcase Ventilation) system is used to vent the excess pressure.
    Back in the olden days the PCV was nothing more than an open pipe at the top of the valve cover with a filter attached to the end to prevent debris from entering. However, primarily for emissions reasons, newer cars have been made to recirculate these blow-by gasses back into the intake. This system uses the vacuum produced from normal engine opperation to draw air out of the crankcase and re-combust it.
    This system generally works fine, but it has two notible drawbacks.
    1) Since the PCV system begins at the top of the valve cover where there are many fast-moving lubricated parts, a certain amount of oil mist gets generated. This oil mist is then drawn out of the valve cover along with the blow-by gasses and eventually line the entire intake tract with oil; which on a turbo car, besides making a mess, also coats the intercooler with oil and reduces its efficiency. (you can install a pcv oil catch can, or vent to atmosphere to solve this problem)
    2) Since the PCV system depends on the intake vacuum to draw air out of the otherwise sealed system, if the PCV piping gets bent, kinked, or otherwise obstructed, the PCV system will fail to function, causing pressurization of the crankcase, and subsequently poping the dipstick.

    On a properly functioning recirculated PCV system, you should be able to feel vacuum from the dipstick hole if the dipstick is removed while the engine is running. Also, you should notice a slight resistance in attempting to fully remove the oil cap with the engine running.
    Aditionally, removal of either of these two items on an AFM-based system (4th gen celicas) should cause a fluctuation of the engine idle speed due to intake air being improperly metered.
  2. sprey16

    sprey16 Well-Known Member

    time to bump up this thread :p
    anyone done it to a 3sge
    i get that it will be basicaly the same idea
    as i broke my rubber pipe it just cracked and broke off
    while im replacing it i thought i might as well put in the filter too .
    so anyone got any pics of it on a 3sge :D?
  3. sr5punk

    sr5punk Well-Known Member

    this is a hell of an idea. one question i have though is, in step four. is that just position the catch the correct direction that the gases are going? may end up doing this real soon.
  4. ST165-2765

    ST165-2765 Well-Known Member Donated!

    fuel filter should have an arrow on it indicating the direction of fuel flow.

    The pcv hose flows from the valve cover to the intake manifold so you want the fuel filter arrow to point towards the intake manifold.
  5. sr5punk

    sr5punk Well-Known Member

    also you got a price on that filter? i checked the fram site and its pretty old. i like how its clear so you can see when it gets dirty, but i work at a bmw cycles dealer and am thinking if it is similar then maybe i could use that one cuz its only 13 bux. the only thing is that my filter has a metal casing so it would be really hard to tell when it is dirty. but i figure you change the thing every 5-10k then it should be ok. anyone know how well this cleans the system if it is gunked up a little already?
  6. sr5punk

    sr5punk Well-Known Member

    opposite direction of flow?
  7. ST165-2765

    ST165-2765 Well-Known Member Donated!

    Don't know what you mean you'll have to explain that more.

    It will not help clean anything that is allready there just help prevent further deposits from acumulating.
  8. Mafix

    Mafix Owner Staff Member Administrator Donated!

    inlet side goes to the valve cover, outlet side to the intake tube
  9. sr5punk

    sr5punk Well-Known Member

    ok cool thanks for all the info guys. anyone else done this mod? i will probably do this mod tomorrow. i am also gunna run some oil cleaner as well to try and get rid of some of the gunk that is aquired after 18 years. hahahah! so on a rating of 1-10 do you guys think this mod is worth it?
  10. sprey16

    sprey16 Well-Known Member

    yay someone bumped it up :p , no 1 cared when i did lol , anyway get pics , i was lazy and just put plastic tube on , because i got wof coming up and dont have time before the wof to do it lol , so i might do it soon :D , tho gets pic and ill be happy ,

    also if any people have pics of these on a 3sge
  11. zak062

    zak062 Well-Known Member

    it cost me like 10$ total for everything including a new hose and clamps...

    Just find a filter that resembles the one in the picture.
  12. sprey16

    sprey16 Well-Known Member

    :D zak , my m8s gt4 was idleing a bit low cuz it didnt have the pcv pipe on it lol so we went and spend 15 bux on a rubber tube , grrr tho too late now , he has the big metal pipe from the turbo 2 :D tho he has a st185 and the pod is mounted in the side of the bumper , i might go shopping 2mrw hehe so as long as i get a inline filter i guess ill be sweet
  13. sr5punk

    sr5punk Well-Known Member

    thats awesome shit guys. i would think this mod would be freaking nutso crazy with people when they want to have a cleaner more efficient ride. any side effects to adding this mod? or is it all gravy?
  14. sprey16

    sprey16 Well-Known Member

    also before i changed the pipe , i sprayed some throttle body cleaner up there and alot of shit came out , also did the tb , and shit came out 2 lol the car sounds funny it starts wit the cleaner in it
  15. sr5punk

    sr5punk Well-Known Member

    good to know. if it ends up working out well then my girlfriends car is going to get one too@
  16. Mafix

    Mafix Owner Staff Member Administrator Donated!

    zak on the turbos you need a catch can not a filter. your filter may last about 1 week before it's clogged up.
  17. sr5punk

    sr5punk Well-Known Member

    hahahaah i got the filter. it came with clips and little hoses. verry nice. 4 bux man. should i buy a new pcv hose or would i be ok cutting into mine?
  18. sr5punk

    sr5punk Well-Known Member

    this topic blew up!!!!!!
  19. JoeJack88

    JoeJack88 Well-Known Member Super Moderator Donated!

    its okay cut into it...unless its clogged
  20. sr5punk

    sr5punk Well-Known Member

    awesome thanks! pics up of it tomorrow. gunna do the mod on lunch tomorrow or after work wednesday!

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