NEW!!! Service Bulletin for Engine Knocking at Startup T-SB 0012-10

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by seilerts, Jan 12, 2012.

  1. Mrs.Diamond

    Mrs.Diamond Junior Member

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    Anyone have this file still?
     
  2. DogDaze

    DogDaze Member

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    I have a 2102 V, and it does this same knock after sitting for long periods of time in driven.
    I wonder if they have a TSB for the V too then?
    (I know, check the V forum). lol
     
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    The v has essentially the same engine. The transaxle has some diff's is all.
     
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  4. LuckyDog

    LuckyDog Junior Member

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    Wow! Thanks for the info. I had the knock happen 3 different times. At first I thought it was a small animal under the hood at startup. Of course on opening the hood, nothing. I'll talk to my dealer. Two years ago I had my intake manifold replaced due to a crack. The repair was covered under the emissions warranty. edit: bummer mine is a 2012.o_O
     
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  5. DogDaze

    DogDaze Member

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    I tend to only get it (on both my wife's 2011 liftback and my 2012 V) when we leave them parked for a while.. like in the garage for a few weeks.. it's generally only once, the first time after leaving them sit.. really difficult to reproduce it after the one occurrence. So, I wonder if this is something to talk to the dealership about? (assuming both are out of warranty now)
     
  6. Mendel Leisk

    Mendel Leisk Senior Member

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    How many miles on it?

    If it's possible to research and DIY the EGR/intake clean out, I would go that route. The dealership will VERY likely be expensive, frustrating, incomplete. DIY where you just clean parts is basically free, apart from a few cleaning supplies, and maybe replacement of the pliable intake gasket, if they're knackered.

    Info here:

    Bad Flywheel | PriusChat
     
    #1186 Mendel Leisk, Nov 12, 2020
    Last edited: Nov 12, 2020
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  7. tvpierce

    tvpierce Senior Member

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    There's a link to the file is in the first post.
     
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    The file is basically an instruction on how to replace the intake manifold with a revised version? I think that proved fruitless though, didn't resolve the issue. I think you just need to clean it, and if you want it to stay clean longer install Oil Catch Can.
     
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  9. Pollymath

    Pollymath Member

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    When I first got my 200k Prius in February of this year this "startup shudder" was pretty common. I live at 7000' in the dry desert, fyi, but we get a decent amount of snow. In the summer, the misfire on startup went away completely. Never encountered it once in the last 6-months...until the temps dropped again.

    I'm running an Oil Catch Can, have thoroughly cleaned the EGR, and cleaned out the intake (not updated) about 6,000 miles ago.

    Is anyone else concerned that this misfire might be the culprit behind blowing headgaskets? Or at least, another factor in it's demise?
     
  10. Mendel Leisk

    Mendel Leisk Senior Member

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    I'm thinking not a culprit, rather a symptom, due to coolant seeping into cylinder, most typically cylinder one or two.
     
  11. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Check this out...

     
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  12. Pollymath

    Pollymath Member

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    Why would it only do it when cold, though?

    For instance, this morning I fired it up and it started fine. It's like...20 degrees (f) outside.

    I marked the coolant tank when I got the car 8,000 miles. It's dropped maybe an 1/2 inch during that time? So if it's weeping coolant, it's a very slow rate.

    Because the Prius is my beater (I've got $900 into it) I'm in no rush to do the headgasket. Until steam is pumping out the tailpipe, I'm gonna give'er. Oh, and my valve seals are trash, so maybe a complete motor would be a better deal anyway.
     
  13. tvpierce

    tvpierce Senior Member

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    It's burning oil?
     
  14. ASRDogman

    ASRDogman Senior Member

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    Why not, not spend the money on a used engine that could possibly have the same problems,
    and replace the head gasket and valve guide seals, for a lot less money.
    Then you know you have a reliable engine.

    It's a guessing game with a used engine.

     
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