PCV removal/install instruction?

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Pyro2k, Sep 26, 2019.

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  1. Pyro2k

    Pyro2k New Member

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    Hello all! this is my first post of my first owner of 2016 Toyota Prius Two (fourth gen)- I will try my best to use English properly since it's my third language- I bought it in 2016 and have used it up at about 130,000 miles now- I had free oil change til 100,000 miles from toyota service- have been changed there oil regularly scheduled - after my oil voucher ran out after 100,000 miles- I realized they charge me 70 dollars for oil change- I went there for two times with paid oil change- I decided started my own oil change- I have used Toyota OEM Oil filter, and used Mobil1 Full Synthetic 0W-20- After about 15,000 miles My engine started having cold start vibrate every time i start it and also it get vibrate at somewhere highway or uphill in odd time, most time it's smooth- I had used bg44k, it did helped- but after two gas tanks, it came back- I suspected that pcv might is fault- because I found oil pooling in the pipe between the top of engine and on the intake hose- and found oil pooling inside of the intake hose which connect to the intake- only one line of oil pooling- not much- I have looked at the butterfly of intake- just regular dirty from carbon- cleaned it with cloth and intake cleaner-

    I have bought new PCV- I know where is PCV location- I have searched over facebook group, google, and this forum- I am not able to find any posts regards how to removal/install PCV without taking other parts apart? I am feeling that I have to take intake manifold out to change pcv?

    I have bought oil catch can- Will install it after all maintenance complete-

    I decided bought Toyota Oil SAE 0W-20 instead Mobil1-

    Please guide me and please give me any tips- thank you all!
     
    #1 Pyro2k, Sep 26, 2019
  2. bisco

    bisco cookie crumbler

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    welcome!

    if no one here knows, try techinfo.toyota.com

    all the best!(y)
     
    #2 bisco, Sep 26, 2019
  3. Raytheeagle

    Raytheeagle Senior Member

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    From rooting around the Gen4/Prime engine bay, the PCV valve is buried behind the intake manifold:cool:.

    I’d remove the air intake and intake manifold and you’ll see the PCV valve;).

    Not easy to access, but might be worth considering the manifold cleaning while there:).

    Once you install the catch can, post up some pics of your handy work (y).
     
    #3 Raytheeagle, Sep 26, 2019
  4. Stripedshrimp

    Stripedshrimp New Member

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    Do you know if you can access the PCV valve from underneath the car? Thanks
     
    #4 Stripedshrimp, Jun 2, 2022
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  5. Raytheeagle

    Raytheeagle Senior Member

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    Not sure :whistle:.

    But it is difficult to access the underneath of the Gen4 / Prime given the location of the center front jack point;).

    If you end up investigating, report back the findings (y).
     
    #5 Raytheeagle, Jun 3, 2022
  6. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Third gen you can, so maybe.

    Addendum: repair manual info attached.
     

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    #6 Mendel Leisk, Jun 3, 2022
    Last edited: Jun 3, 2022
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  7. Stripedshrimp

    Stripedshrimp New Member

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    Wow thanks for the great info!

    Looks like I'll be taking the intake off .
     
    #7 Stripedshrimp, Jun 4, 2022
  8. Stripedshrimp

    Stripedshrimp New Member

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    Wow thanks for the great info!

    Looks like I'll be taking the intake off .
     
    #8 Stripedshrimp, Jun 4, 2022
  9. Stripedshrimp

    Stripedshrimp New Member

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    I got underneath and took the plastic cover off. I looked and looked and looked but I could not find the PCV valve from that vantage point. ☹️
     
    #9 Stripedshrimp, Jun 4, 2022
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  10. CR94

    CR94 Senior Member

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    Looks identical to 3rd-generation PCV set-up ...
     
    #10 CR94, Jun 5, 2022
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  11. Stripedshrimp

    Stripedshrimp New Member

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    I'm getting ready to do the PCV job this weekend. Is there any chance you could post some info about removing the intake manifold? Thank you very much
     
    #11 Stripedshrimp, Jun 23, 2022
  12. Mendel Leisk

    Mendel Leisk MMX GEN III

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    attached:
     

    Attached Files:

    #12 Mendel Leisk, Jun 24, 2022
  13. Stripedshrimp

    Stripedshrimp New Member

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    Thanks. This information will be very useful even though I see it is for a third gen Prius and I am working on a 4th gen.. it will give me a general idea of the order of operation and torque specs .
     
    #13 Stripedshrimp, Jun 25, 2022
  14. Stripedshrimp

    Stripedshrimp New Member

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    By the way, what is the name that software/manual that you are getting this information from? I would like to see if I could afford to buy it myself. Thank you again!
     
    #14 Stripedshrimp, Jun 25, 2022
  15. ColoradoBoo

    ColoradoBoo Senior Member

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    My daughter is bringing over her 2017 Prius this afternoon for her 6-month, 5,000 mile oil change. I have a new PCV valve from my dealer so will be seeing if I can get it swapped out.
    I do remember being told to always replace the throttle body gaskets if I ever remove it but I don't have them so if I can't get to the valve without doing that, will have to wait until I pick up one....or I can run down to my auto parts store and pick one up....don't think that part is crucial for OEM....I'll take pics and report back later.....
     
    #15 ColoradoBoo, Aug 24, 2025 at 11:30 AM
  16. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Missed this, my mistake. Attached is gen 4 Intake manifold and throttle body removal/install info.

    <<<Hitting the wall regarding throttle body removal, will try later. Torque for hold-down nuts/bolts likely same as gen 3 (info in earlier post)>>>
     

    Attached Files:

    #16 Mendel Leisk, Aug 24, 2025 at 11:40 AM
    Last edited: Aug 24, 2025 at 11:54 AM
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