Looking for Explanation of what is on the gen 3 exhaust

Discussion in 'Gen 3 Prius Main Forum' started by Norryboy1a, Jul 22, 2021.

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  1. Norryboy1a

    Norryboy1a Junior Member

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    While trying to repair a noisy heat shield on my 2010 Gen 3, I noticed some strange pipes and what looks like some sort of actuator on the side of the exhaust between the cats and the main pipe going to the muffler. Looks like a resonator of some sort. Any idea what’s the function of it?
     
  2. bisco

    bisco cookie crumbler

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    are you looking at the coolant heating loop?
     
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  3. ChapmanF

    ChapmanF Senior Member

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  4. Norryboy1a

    Norryboy1a Junior Member

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    I really don’t know what it is. There is a hose connected to it that heads up towards the left side of the engine. I suppose that it could be some sort of preheater.
     
  5. Norryboy1a

    Norryboy1a Junior Member

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    The rattle that I thought was coming from the heat shield seems to be coming from that thing.
     
  6. ChapmanF

    ChapmanF Senior Member

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    Have you clicked the link to read about the abgaswärmerückgewinnung?
     
  7. bisco

    bisco cookie crumbler

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    possible. try stuffing fire resistant materials like fiberglas in suspect areas and see if there's any change
     
  8. Norryboy1a

    Norryboy1a Junior Member

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    Just read it. Useful. Ich glaube meine Auspuff muss wechseln.
     
  9. Norryboy1a

    Norryboy1a Junior Member

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    Are there any part numbers out there for this? Looks like a future job.
     
  10. privilege

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    oh cool ! didn't know about that !

    now I understand why the Prius coolant temperature rises from cold to operating temp so quickly compared to other cars.
     
  11. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Repair Manual info:
     

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  12. ChapmanF

    ChapmanF Senior Member

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    Yes.
     
  13. Norryboy1a

    Norryboy1a Junior Member

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    Thank you very much. Now I understand more about why/if the mysterious rattle seems to be coming from nowhere. After looking at the shop manual, perhaps it’s a loose flap or an interior part of the exhaust heat recovery system. Looks expensive. I’m not sure of what / where the No. 3 meter circuit plate is though. I like to understand more about the serviceability and what is involved with the repair or replacement of the EHRS? Your help is appreciated. How much is a shop book? :)
     
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  14. Norryboy1a

    Norryboy1a Junior Member

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    I’ll bet that it calls for a complete replacement. Thanks
     
  15. ChapmanF

    ChapmanF Senior Member

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    If you follow the link there's a diagram, showing some of the parts as replaceable, others not.

    I would be pretty surprised if the source of the noise really turned out to be anything besides one of the heat shields in that general neighborhood. Those are common sources of noises (I've got one myself I'm avoiding at the moment), and the EHRS isn't.

    The no. 3 meter circuit plate (suboptimal Japanese to English translation of printed circuit board) is the circuit board within the combination meter (in the dash) that controls the temperature warning light.
     
  16. Norryboy1a

    Norryboy1a Junior Member

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    Thanks.
     
  17. Norryboy1a

    Norryboy1a Junior Member

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    Well, after careful inspection and testing all other rattling possibilities, it appears to me that there is some damage to the heat recovery system. Specifically the actuator seems to stoved and out of alignment. It must of took a pretty good whack to bend it
    like that.
    Please see the attached pictures. What do you think?
     
    #17 Norryboy1a, Jul 28, 2021
    Last edited: Jul 28, 2021
  18. Norryboy1a

    Norryboy1a Junior Member

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    A35190B3-028C-4BA2-B5F9-67A006AAD4F4.png FFDFB80E-236E-479E-80C1-F3D6A1858496.png
     
  19. Norryboy1a

    Norryboy1a Junior Member

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    I’m fearing that the rattle is internal. There doesn’t seem to be any other visible signs of damage though. Except the heat shield was beaten up a bit. There doesn’t seems to be no interference with the exhaust flow though.
     
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