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. Pollymath

    Pollymath Junior Member

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    Yea, the issue is due to the misfire caused by the inproper fuel/air mix when condensation and/or oil is added to the cylinder.

    If you've got a situation where there is more water in the cylinder than space in the combustion chamber, you've got a bent rod.
     
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  2. mjoo

    mjoo Senior Member

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    Umm all you have to do to create a misfire is liquid in the spark plugs gap.

    Pixel XL ?
     
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  3. Grit

    Grit Senior Member

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    Almost posted that myself but thought it will eventually get poo pooed on.
     
  4. Grit

    Grit Senior Member

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    Didn't say “a bit of condensation” on my end, let alone provided quantity of condensation :whistle:
     
  5. Pollymath

    Pollymath Junior Member

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    Maybe I missed it - is there a post in this thread discussing the differences between the original intake manifold and the newer updated ones?
     
  6. Grit

    Grit Senior Member

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    You can searching for it (y)
     
  7. Pollymath

    Pollymath Junior Member

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    I tried, but with no luck. There was even a discussion about the updated intake manifold didn't really solve the startup knock/shake - which is good to know - I won't search it out.
     
  8. Cosmo Tigato

    Cosmo Tigato Active Member

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    upload_2020-3-6_8-2-50.jpeg
     
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  9. Mendel Leisk

    Mendel Leisk Senior Member

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    Focus! :ROFLMAO:

    (I know, it's tough.)
     
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  10. Grit

    Grit Senior Member

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    Since you tried to search... I’ve seen post from long ago that even when the part was updated under TSB, the knock returned. My best guess is that the head gasket may have packed it’s suitcase before the updated part was put in. I have a refreshed model, it knocked in cold weather winters w/o an OCC so I can vouch that update Intake manifold didn’t fix anything.
     
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  11. Mendel Leisk

    Mendel Leisk Senior Member

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    Yeah I suspect removing/cleaning/reinstalling the existing manifold works about the same as replacement with the revised one.
     
  12. Umar Ali

    Umar Ali Member

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    check your EGR cooler for blockage. i learned it hard way with blown head gasket. i replaced head gasket and cleaned fully clogged EGR cooler and the knock has not come back since even though it was around 46 degrees this morning and last week we had 39 degree morning.
     
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  13. S.Bell

    S.Bell Junior Member

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    Mendel,

    Thanks. I have tried one small bottle of the Techron cleaner (black one) and am getting ready for another bottle due to needing a new fill-up very soon. The first bottle did bring my mpg to roughly 32.5 until I then went and added 2 gallons of gasoline to postpone filling up for a few days. Since those 2 gallons near empty, it got up to 37.8 mpg but dripped to 36.5 (1 bar of gasoline left). So here’s hoping tomorrow after another fuel cleaner and a full fill-up, that it gets even higher mpg again.

    I hoping this Covid mess is over with before reaching 100k miles for maintenance time. I really would like to get all done at that time for ease and money sakes.


    Thanks to everyone else, too.

    Stay safe and healthy!


    iPhone ?
     
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