EGR and engine failure?

Discussion in 'Prius v Technical Discussion' started by mat101, Nov 5, 2018.

  1. Mendel Leisk

    Mendel Leisk Obtuse Angler

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    Yeah I call BS on this: they all clog.
     
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  2. Raytheeagle

    Raytheeagle Senior Member

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    +1;).

    I regularly (as in everyday) drive 65-70 mph for 30 minutes and I have cleaned the circuit twice:cool:.

    But I know how to do the job through practice (y).
     
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  3. Mendel Leisk

    Mendel Leisk Obtuse Angler

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    Assuming no need to clean, just parts swap, how long does it take you now? I'm guessing under 3 hours. You leave that lower cooler nut off?
     
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  4. Raytheeagle

    Raytheeagle Senior Member

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    Under 3 hours, if only :eek:.

    My best is 5 hours and that is with 2 sets of experienced hands assisting;).

    But I have been accused in the past of not being the sharpest knife in the drawer:cool:.

    But I do leave the cooler nut off(y).
     
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  5. Mendel Leisk

    Mendel Leisk Obtuse Angler

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    I probably take 3 hours getting the windshield cowl off and everything back together. And that's just an appetizer. (y)
     
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  6. Raytheeagle

    Raytheeagle Senior Member

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    I’m including pre and post work like splash shield removal and replacement in the time quote;).

    That windshield wiper cowling is definitely in your craw :cool:.

    10 minute disassembly and 15 minute reassembly due to usually putting one but in an incorrect spot leading to rework :(.

    But not too bad overall (y).
     
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  7. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    In other EGR systems the problem is low temperatures. Also, wouldn't the change to post-cat supply raise the gas temperature? It would certainly cut down on the unburned hydrocarbon content, so less latent fuel in the EGR...

    The big difference in my mind is that a pre-cat EGR source allows the engine to actually use some of the recovered HC in the exhaust, the post-cat system sacrifices that but gains hotter, more stable EGR flow temps with less random garbage in it.
     
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  8. Mendel Leisk

    Mendel Leisk Obtuse Angler

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    Lot of info there, thanks.

    The 4th gen EGR cooler is a different shape too. It'd be nice to be a fly-on-the-wall in the engineer meetings.
     
    #28 Mendel Leisk, Nov 15, 2018
    Last edited: Nov 15, 2018
  9. mat101

    mat101 New Member

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    Update: I have now driven nearly 2000km after the EGR valve was replaced by Toyota. No problems yet, engine feels like new.
    I am really grateful for all the help from you guys, and to have found this group!

    Lessons learned:
    * EGR valve replacement is _not_ part of the Toyota service program, not here in Sweden anyway.
    * The failure is only visible if the engine is on at its minimum.
    * The failure manifests itself after some years if the car has been driven at low speeds.
    * It definitely sounds like a head gasket problem, but it can happen on an engine with far less km.

    So if you suspect your Prius has a broken head gasket, check the EGR system first ;)

    Thanks again!
     
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  10. bisco

    bisco cookie crumbler

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    congrats!(y)
     
  11. tvpierce

    tvpierce Senior Member

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    I presume they only replaced valve and that they didn't replace or clean the cooler?
     
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