Intake Manifold and EGR Cleaning/Replacement - How hard is it really?

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by ksyolsen, Oct 26, 2025.

  1. Mendel Leisk

    Mendel Leisk MMX GEN III

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    What 165k miles will do:

    upload_2025-11-15_10-56-46.png

    Definitely NOT what the engineers envisioned, I'd wager.
     
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  2. Mendel Leisk

    Mendel Leisk MMX GEN III

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    I meant pic of the intake manifold mating surface, the black plastic thing. :)

    Bump exposure enough to see the degree of clogging of the small diameter EGR passages, one per port.
     
  3. ksyolsen

    ksyolsen Junior Member

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    Gotcha haha sorry about that. Here ya go

    I’ve done an initial pass on cleaning but will probably do some more for good measure.
     

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  4. Mendel Leisk

    Mendel Leisk MMX GEN III

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    How were these, pre-cleaning:

    upload_2025-11-15_11-3-16.png

    Cylinder one tends to be first to fully clog (at left end, as you stand at front of car).
     
  5. ksyolsen

    ksyolsen Junior Member

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    Definitely some build up. Not completely blocked by any means though.

    but some nice chunks and bits came out with a brass brush.
     
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  6. ksyolsen

    ksyolsen Junior Member

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    Need to do some more cleaning but they’re cleared out mostly
     

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  7. Mendel Leisk

    Mendel Leisk MMX GEN III

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    You'll be buttoning up by supper time. (y)
     
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  8. ksyolsen

    ksyolsen Junior Member

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    @Mendel Leisk having trouble getting the holes for the long stud to line up without forcing it down. I have the bottom stud installed to the exhaust pipe and nothing else is bolted down but I really have to force it down to line up and it’s difficult to thread in.
     

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  9. ksyolsen

    ksyolsen Junior Member

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    I got it but it was a tight fit
     

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  10. ksyolsen

    ksyolsen Junior Member

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    Ran into a snag with the Thermostat.
    One of the studs has a bolt rusted to it. I got the entire stud out to try to save it and just get a new nut.


    However I also broke off the 10mm bolt :/

    Adding some pb blaster and letting it sit overnight and might try to torch it and use vice grips to get it out?

    any tips?
     

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  11. ksyolsen

    ksyolsen Junior Member

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    Good day today overall.

    9:30am-6:30pm with an hour for lunch.


    Intake removed and initial clean
    PCV valve replaced
    oil catch can tubing from PCV routed
    EGR system removed and replaced
    Water pump removed
    Thermostat removed
    Spark plugs replaced

    Tomorrow is:
    tackling that broken bolt
    thermostat and water pump install
    Finish Oil catch can
    Reinstall intake manifold and throttle body, etc.
    refill coolant
    Pray it starts up okay haha

    any suggestions for that bolt are appreciated!! I’m really bummed about that, I could’ve had the water pump and thermostat done tonight but alas, no project ever goes 100% smoothly haha