Possible replacement EGR cooler

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by avoice217, Jun 16, 2025.

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  1. ASRDogman

    ASRDogman Senior Member

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    I didn't finish typing... :eek:
    Then you posted..... but it's finished now.... (y)

     
    #41 ASRDogman, Jul 4, 2025 at 6:28 PM
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  2. NutzAboutBolts

    NutzAboutBolts Senior Member

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    :ROFLMAO::ROFLMAO::ROFLMAO: It’s all good! (y)
     
    #42 NutzAboutBolts, Jul 4, 2025 at 6:54 PM
  3. avoice217

    avoice217 Member

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    Hey all so I just bought myself a nice used pressure washer. Tomorrow I'm gonna go get some pump oil for it and then finish cleaning it up before I put it all back together and then test it. If it runs like it's supposed to, then I'll spray the hell out of the cooler to see what I can get out of it. Also per Nutz's comment, I'll go get myself some of that purple power stuff to attack it as well.
     
    #43 avoice217, Jul 5, 2025 at 12:39 AM
  4. NutzAboutBolts

    NutzAboutBolts Senior Member

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    make sure to soak the whole EGR cooler over night in 50/50 purple power and water. Then use the red nozzle to spray in there. I sprayed the front and back of the EGR cooler for a while and carbon flows out.
     
    #44 NutzAboutBolts, Jul 5, 2025 at 1:32 AM
  5. Mendel Leisk

    Mendel Leisk MMX GEN III

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    #4 stopper in the smaller end, prop in corner of laundry sink, pour in lye solution, takes about a cup.

    you may need to preliminarily open up some passages with a wire.
     
    #45 Mendel Leisk, Jul 5, 2025 at 9:46 AM
    Last edited: Jul 5, 2025 at 9:53 AM
  6. avoice217

    avoice217 Member

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    Hey there, just so you know Google has been very vague in terms of a lye solution. All they're telling me is that it's a mix of NOH, but that's it. Then it goes about suggesting different brands. So far all I've used is Five Star PBW and now im currently on Purple Power. However, I still need to get some oil for the pressure washer before I put it all back together.
     
    #46 avoice217, Jul 5, 2025 at 4:44 PM
  7. xliderider

    xliderider Senior Member

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    Lye is Sodium Hydroxide, or in chemical nomenclature NaOH.

    SM-S936U ?
     
    #47 xliderider, Jul 5, 2025 at 9:27 PM
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  8. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Click on the link “lye” in post #45.

    I’ve noticed lye, aka sodium hydroxide (NaOH) sales are somewhat restricted in the States (also but to a lesser degree in Canada), but still available mail order. It used to be readily available locally through grocery/hardware stores, but not now.

    Google lye solution instructions and cautions; it is a strong caustic, the opposite of an acid but just as dangerous.
     
    #48 Mendel Leisk, Jul 6, 2025 at 9:27 AM
    Last edited: Jul 6, 2025 at 10:39 AM
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