Intake manifold cleaning necessary with revised part?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Slide_into_the_V, Mar 10, 2020.

  1. Slide_into_the_V

    Slide_into_the_V Junior Member

    Joined:
    Apr 12, 2018
    14
    3
    0
    Location:
    phoenix, az
    Vehicle:
    2013 Prius v wagon
    Model:
    I
    Is this maintenance still necessary with the revised part? And if so, how often?
     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    90,822
    40,803
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    Might as well do it while cleaning the rest of the egr circuit, maybe every 50k
     
    mjoo and TonyGB like this.
  3. JimboPalmer

    JimboPalmer Tsar of all the Rushers

    Joined:
    Apr 14, 2009
    12,202
    6,565
    2
    Location:
    Greenwood MS USA
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    While I am not familiar with any revisions, in general, you never need to clean the intake manifold.
     
  4. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    90,822
    40,803
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    Wrong again jumbo
     
    mjoo, TonyGB and Raytheeagle like this.
  5. Rebound

    Rebound Senior Member

    Joined:
    Mar 11, 2010
    3,719
    2,338
    0
    Location:
    Portland, OR
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    I wouldn’t say “never.” If the intake passages are restricted, they should be cleaned, wouldn’t you agree?

    Some cars show a lot of clogging and others have little clogging. We’ve seen photos here on PriusChat which show really bad clogging. I don’t know why some clog more than others, but usually, If the EGR and pipe clogged up with oily goop, the intake manifold will also have this goop. If the EGR is dry and fairly clean, the intake manifold will probably be fairly clean as well.
     
    Threej likes this.
  6. JimboPalmer

    JimboPalmer Tsar of all the Rushers

    Joined:
    Apr 14, 2009
    12,202
    6,565
    2
    Location:
    Greenwood MS USA
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    Ah I was thinking of those individuals who keep 'cleaning' the fluid out of the intake manifold, which is just gasoline pumped back out of the cylinders, and always puddles there.
     
  7. Rebound

    Rebound Senior Member

    Joined:
    Mar 11, 2010
    3,719
    2,338
    0
    Location:
    Portland, OR
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    Actually... we think that goop is oil, not gasoline. And we think the cause of that oil is from the PCV, and it can be prevented by installing an oil catch can. This, in turn, keeps the valves clean and we think it will prevent the EGR from having the oily deposits which then clog the EGR cooler, EGR valve, and intake manifold.

    These things are different but interrelated.
     
    pjksr02 likes this.
  8. wheezyglider

    wheezyglider Active Member

    Joined:
    Mar 12, 2011
    149
    126
    0
    Location:
    SF Bay Area
    Vehicle:
    2010 Prius
    Model:
    Five
    It's possible that the revised manifold does a better job of evenly distributing EGR gas between cylinders as the path clogs. But it still does clog because the root cause hasn't been fixed (see @Rebound post above). So nobody can say how often to clean it, but the general consensus is to aim to do your first cleaning around 100K miles, and every 50K after. If you do install an OCC it's expected that this will greatly reduce the amount of goop that clogs the EGR path.

    Either way, if you get a rattle on startup that's a sign to get on it post haste.
     
    TonyGB, pjksr02 and Mendel Leisk like this.
  9. Mendel Leisk

    Mendel Leisk Sunday driver DIY’r

    Joined:
    Oct 17, 2010
    41,960
    30,091
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    There are 3 ways various substances get into the intake manifold: PCV, EGR, and spit-back from the ports.

    Just clean it periodically, it's not that hard, and from then on you can set a reasonable interval. And chances are if you do some mod, say install an Oil Catch Can, that interval can be significantly longer. But verify: OCC's are far from 100% effective.

    My algerbra's maybe out-to-lunch, but I would postulate: if you put two of your pick of OCC in series, the first collects x, the second collects x/2, then that style of OCC is 50% efficient?

    If you watch video of transparent wall OCC in action, it's a miracle that they collect anything: stuff blows through there (and on to the intake manifold) very fast.
     
    #9 Mendel Leisk, Mar 10, 2020
    Last edited: Mar 10, 2020
    pjksr02, wheezyglider and Raytheeagle like this.
  10. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    4,365
    3,313
    1
    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    We scoped my cylinders at a meet up with a revised one on a refresh. “Does a better job” doesn’t even comes close to describe the distribution :p
     
  11. wheezyglider

    wheezyglider Active Member

    Joined:
    Mar 12, 2011
    149
    126
    0
    Location:
    SF Bay Area
    Vehicle:
    2010 Prius
    Model:
    Five
    I'm surprised you could tell any difference. You guys take pix?

    I figured the two extra dirty cylinders on my 2010 were due to valve issues, never even thought to attribute it to those nasty EGR runners in the original IM. (I guess maybe both things could be true, with one the cause of the other.)
     
  12. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    4,365
    3,313
    1
    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    We took photos of each cylinder with raytheeagle’s scope, photos are posted twice on 2 different threads, can’t miss it with a easy short simple quick search on here.
     
    RMB and Raytheeagle like this.
  13. Mendel Leisk

    Mendel Leisk Sunday driver DIY’r

    Joined:
    Oct 17, 2010
    41,960
    30,091
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    I'm still not clear what the verdict was. Do you think the revised intake made a difference? I'm guessing it might make the pistons look more uniform?

    Funny thing, if you look up the intake manifold, there's more part number supersessions than you can count on one hand.
     
  14. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    10,745
    14,692
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    I'll save folks the effort;):

    Possible Monthly install meets. Bay Area-Fremont

    They'll also get to see @The Critic 's fine work with paint finish:).

    2 separate engines were bore scoped though for comparison(y).
     
    RMB, wheezyglider and Mendel Leisk like this.
Loading...