EGR intake cleaning and also 100,000 maintenance really required

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Prius11and20, Apr 24, 2022.

  1. Prius11and20

    Prius11and20 Junior Member

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    I will be returning to my 2011 Prius with close to 100,000 miles, and wanting to check in on how important an EGR/intake valve cleaning is at this point? I do have a ping when the car first gets going, which seems to indicate possibly this would fix it. Thoughts? Just trying not to spend and arm and a leg that is not needed, and I don't do any of my own car maintenance (not in my toolbox of skills:).

    Furthermore, what would you recommend being absolutely necessary to do around this 100,000 mile time? I had all warranty work done on it until it expired about a year ago. Does the ATF or brake fluid need to be changed for sure? They also indicate the brakes are at 5 and want me to have them changed, but do you feel that is necessary (have never been replaced)....and is there a way to tell they're not doing well by the way the stopping situation shows? Thanks for any and all info I can get, as was thinking of purchasing a new Prius, but they're so impossible to come by right now am trying to maintain this one as well as I can so I can have a safe and reliable ride. And I also know a lot of folks say that these things run to 300,000 with almost no maintenance...thoughts?
     
  2. bisco

    bisco cookie crumbler

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    you are right at the blown head gasket mileage, it is absolutely imperative to clean the entire egr circuit. and i would add an occ as well.
    there's not much to 100k regular maintenance, do you have a schedule?

    i would also change the tranny fluid
     
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  3. ChapmanF

    ChapmanF Senior Member

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    The car will tell you how well the EGR is flowing if you ask it. It runs that test routinely while you are driving, so when you ask, it just gives you the most recent test result. We have a thread about that.

    You can ask with any basic scan tool (or phone app with a car diagnostic dongle) that is able to do monitor test status ("mode 6") queries. You can get those for cheap and they can be very valuable to have around, even you hire out most of your mechanical work. A recent thread is a good review of several of those. (It has details specific to Prius Gen 2, but should be useful in broad strokes.)

    We've been seeing test results around 21 or 22 kPa for freshly-cleaned EGR systems. I cleaned mine at around 15x,000 miles, when my reading was down to 10 point something. Based on your driving and other factors, yours could be clogging at around the same rate, or not as fast, or faster. The test result will tell you. You also might decide the 10 point something threshold I used was too daring for you, or not daring enough. We really don't know enough yet to say how low is too low. (The test limit threshold where a P0401 code is given is down below 2 kPa, but that's widely suspected here of being longer than you want to wait.)

    It is worthwhile to remove just the intake manifold and inspect its four small EGR passages directly. The built-in test can't tell you how those are doing, and the manifold by itself is an easy job (say, ½ hour for someone mechanically inclined).

    Overhauling all the rest of the EGR is much more grueling and labor-intensive (and expensive, if you are paying hourly for the work). So it can be sensible to make that call based on what the flow test is telling you.
     
  4. Prius11and20

    Prius11and20 Junior Member

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    How does one clean the entire EGR circuit? I don't do any of my own mechanical work. I was told in 2016 they replaced the EGR valve for because of a recall. They seem more concerned about doing the intake manifold or timing gasket. When you say it's time for the head gaskets to blow, can you please explain how you know this? And what is an OCC? Thank you.
     
  5. bisco

    bisco cookie crumbler

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    how many miles have you put on since they replaced the egr valve?

    cleaning the intake manifold is part of the circuit.

    ignore the timing gasket

    a lot of gen 3 prius blow the head gasket around 100k or more, due to back pressure from a clogged egr circuit.
    occ = oil catch can. it captures some of the blow by from the engine, keeping it from clogging the egr circuit.
    along with the pistons and rings, and the brake booster, it is the weak link of 2010 to part way thru 2014, when toyota upgraded the pistons and rings.

    watch

    watch

    watch

    watch
     
  6. ChapmanF

    ChapmanF Senior Member

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    I can't say that any of the "it happens due to X" ideas around here has been really shown yet, and this particular X isn't one I've even seen here before now.
     
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  7. Mendel Leisk

    Mendel Leisk Underfoot

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    See first link in my signature, ditto for OCC.

    (if on a phone, turn it landscape to see sig)
     
  8. bisco

    bisco cookie crumbler

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    agreed, senior moment. o/p please ignore the advice of an old man, and listen to chapman.
     
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