Head gasket?

Discussion in 'Gen 5 Prius Main Forum' started by Willie Walker, Dec 31, 2025 at 12:52 PM.

  1. Willie Walker

    Willie Walker New Member

    Joined:
    Tuesday
    1
    0
    0
    Location:
    Salisbury md
    Vehicle:
    2012 Prius
    Model:
    Five
    I have a 2012 Prius. And I’ve got 256,000 miles on it. I have a catch cannon and I noticed I started having White look like water in it. And then I started having misfires. I took the spark plugs out and the first cylinder was white all the rest were black. So I figured I had a blown head gasket. So I ordered another motor it came in and it did the same exact thing. So now I rebuilt my old engine put it in And I’m getting a clear substance in the Catch can. I’m not a mechanic but I’ve done this transaction four times. I’m just trying to get it fixed. I do know when it’s running sometimes the smoke is somewhat white. And then other times it’s not. I don’t know if that’s because sometimes the thermostats engaged and then that’s the way the white smoke comes out. I didn’t notice it dripping out of the muffler in maintenance mode. But I taste of the substance and it just taste like water. Is there any chance my throttlebody could release antifreeze into the intake and that could go into the catch can? I’m at a standstill. Thank you so much for your knowledge and help and advance.;)
     
  2. PriusCamper

    PriusCamper Senior Member

    Joined:
    Mar 3, 2012
    12,825
    5,198
    0
    Location:
    Pacific Northwest, USA
    Vehicle:
    2007 Prius
    Model:
    Two
    Welcome to PriusChat... For not being a mechanic you're doing some pretty impressive work!

    Seems like bad luck with a bad replacement engine... Also maybe your headgasket job wasn't thorough enough?
     
  3. Gorgonzola

    Gorgonzola Junior Member

    Joined:
    Sep 29, 2024
    39
    23
    0
    Location:
    New Hampshire, USA
    Vehicle:
    2024 Prius
    Model:
    LE AWD-e
    Before this post gets too involved, wondering if you’ve posted this question in the Gen 3 forum?
     
    PriusCamper likes this.
  4. Brian1954

    Brian1954 Senior Member

    Joined:
    Jan 31, 2021
    2,273
    903
    0
    Location:
    South Central PA, USA
    Vehicle:
    2011 Prius
    Model:
    III
    I sent a message to a moderator earlier today and ask them to move this thread to the Gen 3 forum. It usually takes about 24 to 36 hours to get done.
     
    PriusCamper and Mendel Leisk like this.
  5. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    114,156
    52,032
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    are you losing any coolant?
     
  6. PriusCamper

    PriusCamper Senior Member

    Joined:
    Mar 3, 2012
    12,825
    5,198
    0
    Location:
    Pacific Northwest, USA
    Vehicle:
    2007 Prius
    Model:
    Two
    We need more ways to prevent people from posting in the wrong forum! This problem is happening more and more often lately and when replying to posts its not very obvious which forum you're replying on.

    Maybe if we increased the font size that identifies which forum you're on and add a popup window that questions (in this case) if a Gen3 owner is posting in the correct forum, because clearly they posted in the wrong forum and it's ridiculous that we don't have more prompts to prevent that! It makes too much work for the moderator to move stuff to other forums. We need to fix that!
     
    #6 PriusCamper, Jan 1, 2026 at 11:44 PM
    Last edited: Jan 1, 2026 at 11:58 PM
  7. douglasjre

    douglasjre Senior Member

    Joined:
    Sep 13, 2008
    2,188
    722
    0
    Location:
    Null, NL
    Vehicle:
    2010 Prius
    Model:
    ----USA----
    Tell me more about this catch cannon that you have
     
  8. rjparker

    rjparker Tu Humilde Sirviente

    Joined:
    Jun 6, 2008
    10,205
    6,351
    7
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    Maybe its an anti parts cannon defense system using advanced reusable Spacex socket wrenches.