Gen 4 PVC Valve

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Sheeks, Aug 10, 2020.

  1. Sheeks

    Sheeks Junior Member

    Joined:
    Aug 10, 2020
    2
    1
    0
    Location:
    Mississippi
    Vehicle:
    2016 Prius
    Model:
    Four
    New here. 140k on my Gen 4 (2016). Looking to clean my throttle body, clean the EGR tube, replace plugs and pvc valve in the next couple weeks, but I can not find any information on the location of the PVC Valve. Any ideas on location and/or best access ? My mpg has decreased from 55+ and now stays between 48-50. Any information will be helpful. Thanks.
     
    Raytheeagle likes this.
  2. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,135
    15,243
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Welcome to Prius chat(y).

    The PCV valve is buried behind the intake manifold:cool::

    8AF25FC4-23C1-4F4C-BB45-4A1B7FC0B70F.jpeg

    And the egr cooler will be a bear to remove, requiring the inverter to be moved:(:

    69512831-CB06-4DB0-B0C7-E6A3EB9BE3AA.jpeg 02AFB6A0-0EE6-4288-AA05-AD5EA88C24B6.jpeg

    I put an oil catch can on too, similar to what the Gen3 folks do:):

    FC0F31A1-AED4-4EF7-A007-E4D890DBAE93.jpeg

    I had to add my own bolt in the top as it didn't come with that:whistle:.

    The throttle body and intake looked good at 21k miles on our Prime;):
    4FCD7024-FEE7-47F1-8940-151CB53AD546.jpeg 67D53BE3-236C-43C6-8160-108D8E9FB1AA.jpeg 99AC464A-CDD2-40B2-8D51-98E68164B750.jpeg 5C11973A-FC0C-4086-9AAA-E951855ADE73.jpeg FD82E3BD-37E4-4448-90F0-7CEBD6E3E8FE.jpeg 2B565D34-011B-46EB-9430-A5EFA93B665D.jpeg 5FB6BDD3-0F0D-4085-84F6-1406A8C5B461.jpeg

    Hope that helps(y).
     

    Attached Files:

    Mendel Leisk, ETC(SS), amos and 3 others like this.
  3. amos

    amos Active Member

    Joined:
    Aug 19, 2017
    319
    273
    0
    Location:
    los angeles
    Vehicle:
    2016 Prius
    Model:
    Two
    @Raytheeagle , your car is brand new, why did you think it needs that? was the egr cooler dirty?
     
  4. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,135
    15,243
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Is it ever too early to hedge :whistle:.

    As an aside, guess what the oil catch can is already catching:cool:.

    So I'll say it isn't too early as the spooge is already there;).

    And the cooler will be its own effort as the inverter will have to move(y).
     
    amos likes this.
  5. amos

    amos Active Member

    Joined:
    Aug 19, 2017
    319
    273
    0
    Location:
    los angeles
    Vehicle:
    2016 Prius
    Model:
    Two
    is your invite still valid? mine is already 140k, i got so much time now to drive up north. what were the findings over there at the OCC
     
    Raytheeagle likes this.
  6. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,135
    15,243
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Once we get out of pandemic land, absolutely:).

    I found a teaspoon amount after 4K miles on the odometer, which is really about 1.5k miles of engine use :cool:.

    So since there was a pool in the intake manifold, I think it's prudent ;).

    Hope that helps (y).
     
    amos likes this.
  7. amos

    amos Active Member

    Joined:
    Aug 19, 2017
    319
    273
    0
    Location:
    los angeles
    Vehicle:
    2016 Prius
    Model:
    Two
    yes helps, i think i am going to do something about it, i will order an egr cooler from ebay, seems like i cant ignore that issue, wonder if other already did the OCC and cleaned all that egr path
     
    Raytheeagle likes this.
  8. Travis Decker

    Travis Decker Member

    Joined:
    Jul 15, 2015
    116
    98
    0
    Location:
    Portland OR
    Vehicle:
    2012 Prius
    Model:
    II
    On the Gen 4 if the EGR gas comes from behind the cat it's supposed to solve these problems and you aren't supposed to have to do any of this stuff....
     
    amos likes this.
  9. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,135
    15,243
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    That Potentially solves the egr cooler Clogging but not the PCV valve blow by ;).

    The oil catch can cured that to a certain degree(y).
     
  10. amos

    amos Active Member

    Joined:
    Aug 19, 2017
    319
    273
    0
    Location:
    los angeles
    Vehicle:
    2016 Prius
    Model:
    Two
    so how can i get an access to the pcv without disassembling half the car?
     
  11. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,135
    15,243
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Just the pressure washer is needed;).

    Save your $$$ for the cooler for something else:).

    But the oil catch can is a good idea(y).
     
  12. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    14,223
    10,056
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    If you're quite convinced it needs replacement, here's a thread where if you follow down the page you'll get a good sense of pros and cons of different ways you might try. (It's a Gen 3 thread, but the engine at least is largely the same.)

    Every Prius ever made makes a small pool of gloop in the intake manifold though. If you remove that, it will only feel intensely self-conscious in the company of other Prii.
     
    amos, Raytheeagle and krmcg like this.
  13. Mendel Leisk

    Mendel Leisk Sand Pounder

    Joined:
    Oct 17, 2010
    45,017
    32,165
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Gen 3 PCV valve can be reached from below, if you're not needing to remove intake manifold. 4th Gen is essentially the same engine, though the periferals are different, so may still be doable thus.

    @NutzAboutBolts has a (3rd Gen) video showing access from below.

    That said, removal and cleaning the intake manifold may be warranted anyway.
     
    NutzAboutBolts likes this.
  14. amos

    amos Active Member

    Joined:
    Aug 19, 2017
    319
    273
    0
    Location:
    los angeles
    Vehicle:
    2016 Prius
    Model:
    Two
     
Loading...