EGR and engine failure?

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

  1. mat101

    mat101 New Member

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    Hello,

    My first post here.

    I have a Prius v from 2012 with low mileage (60000km) - here in Sweden it is called Prius Plus.

    Three weeks ago the engine started to misfire after we drove the car downtown for about 5km. This was when the car was parked and the engine was started to recharge the battery.
    I noticed how the engine was struggling, and how the computer was trying to gas without success.

    When i tried to move the car there was a very bad smell from the engine and it was impossible to drive it.

    Eventually the car was towed to the local Toyota assistance, where the same problem was reproduced once but no error codes were reported.

    After that, the car started to work normally and it was returned to me without a diagnosis. It has worked so far, but I am noticing that the engine sounds different, slower, when running at minimum.

    As far as I know no inspection of the EGR was performed. Do you think that might be related?

    The car has a low mileage and has been driven mostly in town at low speed.

    Thanks in advance for your input on this. The personnel at Toyota was as puzzled as me and did not have a clue about it.
     
  2. bisco

    bisco cookie crumbler

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    welcome!

    try resetting a trip meter and see what king of l/km you are getting. it could be many things, even bad petrol.
    at 60km it really shouldn't have any problems. check the engine air filter and housing as well.
     
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  3. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    Engine coolant reservoir is pretty steady, not requiring frequent top up?
     
  4. mat101

    mat101 New Member

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    Hello, thanks for your suggestions!

    The car has just gone through all Toyota service checks without apparent problems, so no coolant issues have been noticed. There are no warning lamps either.

    I will try checking if the fuel consumption is higher - although that might be related to the heavy winter tires that are needed here in Sweden.
     
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  5. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    I think "to be continued", considering all the symptoms you describe in your initial post. Keep in touch.
     
  6. mat101

    mat101 New Member

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    Hello again,

    Eventually I have taken the car to Toyota for assistance, since the engine started to emit a clanking noise and I noticed some liquid dropping from the exhaust this morning, after a short drive in town.

    See following picture and video
    [​IMG]
    [​IMG]


    Surprisingly, I was able to drive the car to the assistance with no warning lamps even if I noticed quite a lot of white smoke coming out of the exhaust when the car stopped at the first traffic light. Again, the problem seems to be most noticeable when the engine is running at minimum, charging the battery. Switching to PWR mode seems to somehow alleviate the problem.

    I explicitly asked for a checkup of the EGR system, we'll see what they come up with this time.

    Thanks again for your help!

    /m
     
    #6 mat101, Nov 7, 2018
    Last edited: Nov 7, 2018
  7. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    Towards the end of the video, yeah: that doesn't sound good. :(

    What's the puddle under the exhaust, water, oil?

    A relatively easy check, is to inspect the EGR pipe, see if it's clogging with carbon, and how much. Strange though, 60K is pretty early for that. See @NutzAboutBolts video #16 here:

    Nutz About Bolts Prius Maintenance Videos | PriusChat
     
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  8. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    One more thought: bad gas?
     
  9. PriusV17

    PriusV17 Member

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    Symptoms sound like you have a blown head gasket. But given you only have 60km (or 37k miles) that is very unusual. Did the car go through something out of the usual normal driving patterns? Like do you drive up steep mountains a lot? Extreme engine heat is the biggest culprit.
     
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  10. mat101

    mat101 New Member

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    Not at all. The car has been used mostly for slow-speed city driving. This Toyota blog entry though notes that the EGR might get clogged because of this (link in my next postI, I'm not allowed to post links yet)

    A blown head gasket at 60000km would be really weird. Let's see what the Toyota service guys say about it this time. Weirdly enough they were not able to detect any fault two weeks ago :-(
     
  11. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Are you the original owner of this car? Very surprising to have any problems with any car, but especially a Prius with this little of miles
     
  12. mat101

    mat101 New Member

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    Yes I am the original owner, the car has been driven mostly in town. I was 100% happy with it until this happened :(
     
  13. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    I'm still wondering: what is that pool under the tail pipe: water, oil, coolant, hard to tell?
     
  14. mat101

    mat101 New Member

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    It was hard to tell actually. It looked like water though so it might have been condensation from the AC?
     
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  15. mat101

    mat101 New Member

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    Update: Toyota was finally able to get an error code from the car, confirming that it was the EGR system being clogged.

    I will not get my car back until next week, I will report back how it's going.

    Here is the blog post from Toyota about the EGR which I showed them:
    Toyota EGR valve: Understanding exhaust gas recirculation valves - Toyota

    Thanks again for your help!
     
  16. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    Interesting link, thanks. It's pretty much what people have been saying here, but good to here confirmation. One gem: that a lot of low speed driving might accelerate the carbon accumulation.

    Regardless, I suspect they all build up carbon, and regular checks are warranted, at least of the EGR pipe.
     
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  17. mat101

    mat101 New Member

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    We use our car mostly in the city, so it usually drives around 50km/h or slower.
    That would explain the clogging. Weirdly enough the car has undergone Toyota service every year, but inspection of the EGR pipe is not included in that!
     
  18. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    I think it'll clog under most any conditions. I doubt there's a single third gen that isn't slowly going south.

    Third gen egr intake is from a pipe that connects to the exhaust upstream of the catalytic converter Fourth gen, the similar pipe connects downstream of the catalytic converter. I take this as tacit ackonwledgement from Toyota that there's inherant problems with third gen EGR system: the exhaust gasses it's getting are too hot and unfiltered.
     
  19. Raytheeagle

    Raytheeagle Senior Member

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    I drove our 2010 with 190 k miles on it mostly freeway and at freeway speeds of 65 mph;).

    I be done the circuit cleanse twice and it’s had good deposits both times:cool:.

    While certain conditions may exacerbate the deposits, there is no getting around them:(.

    So be ready to clean(y).
     
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  20. PriusV17

    PriusV17 Member

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    Wow. Good info to know especially coming from Toyota. They should include this cleaning as part of the maintenance recommendation.

    "Why might an EGR valve fail?
    Its location within the direct path of flowing exhaust gases means that soot can accumulate around the EGR valve and block its free movement. It is possible to mitigate this by ensuring the vehicle is regularly driven at sustained speeds above 40mph. Constant use of any vehicle in low-speed, urban environments with frequent stops will accelerate the amount of soot collecting around the EGR valve."
     
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