History of overheating, do I have a bad head gasket now?

Discussion in 'Gen 3 Prius Technical Discussion' started by suirPPrius123, Jul 20, 2021.

  1. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Replacing head gasket and ignoring cleaning of the EGR system (and intake mainifold) might well be why the replacement gaskets are promptly blowing.

    Just my 2 cents: the clogged EGR is the cause of head gasket failures: miles pile on, EGR clogs, head gasket blows. And almost invariably it fails at cyl 1 or 2, which is the end of the intake manifold whose EGR passages clog first.
     
  2. suirPPrius123

    suirPPrius123 Junior Member

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    Makes sense! So maybe I could replace the head gasket, and just have the mechanic clean the EGR. Does that mean this might be completely unrelated to my car overheating a lot a few months ago due to a failed thermostat? or could they both be working together to make the problem worse? FWIW my OBDII said engine misfire in cyl 1, 2, and 3.
     
  3. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Are you thinking to replace head gasket yourself, have mechanic do Exhaust Gas Recirculation cleaning? If so, I’d be inclined to do the opposite: the head gasket replacement is a big job, and egr cleaning relatively easy, but time con$uming. More info on the latter in my signature.
     
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  4. ASRDogman

    ASRDogman Senior Member

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    Do both, a lot of money NOT spent....
     
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  5. suirPPrius123

    suirPPrius123 Junior Member

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    I'm a medical student and just don't have the time, I also have no mechanic skills or tools. I would pay a local mechanic to do both.
     
  6. Grit

    Grit Senior Member

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    Easy, since there’s no budget constraint mentioned, not a diy’er and no alternative travel work around listed, just sell the car as a project and buy an entirely new 2021 prime. No down time to anything and will last for many years.
     
    #26 Grit, Jul 27, 2021
    Last edited: Jul 27, 2021
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  7. PriusCamper

    PriusCamper Senior Member

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    Yeah... that would definitely explain what the mechanic had a problem with in previous efforts and probably offering that info to 'em will make them more willing to do another head gasket the right way this time!
     
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  8. Tideland Prius

    Tideland Prius Moderator of the North
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    *threads merged *
     
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  9. PriusCamper

    PriusCamper Senior Member

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    In terms of a long term plan for regular maintenance of the EGR, you could but a new EGR and have the mechanic install that and then keep your old EGR and clean it yourself and then when it's time have your mechanic swap EGRs again. I know some mechanics don't like cleaning stuff and over-charge for that kind of work.
     
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  10. suirPPrius123

    suirPPrius123 Junior Member

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    I saw in a separate thread that if you drove with a bad head gasket much (which I have done!) it may have done permanent damage to the engine, so you may not want to just replace the head gasket. Is this true? I fear that if I replace the EGR and head gasket, maybe the engine is already extremely damaged and will need replacement soon anyway?
     
  11. PriusCamper

    PriusCamper Senior Member

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    Bent piston rod is possible and can mostly be checked by putting each piston at top dead center with head off and making sure pistons are in exact same spot on all four of them.
     
  12. Mendel Leisk

    Mendel Leisk Sand Pounder

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    EGR “replacement” is overkill, typically. Unless it’s a hopeless lump of carbon. And just moderately difficult DIY. More info in my signature.
     
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  13. Raytheeagle

    Raytheeagle Senior Member

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    Pressure washer gets the job done;).

    Of the dozen I have done, the pressure washer has gotten them all clean every time:).

    And there have been some seriously clogged coolers:eek:.

    Something to consider (y).
     
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