Misfire On Multiple Cylinders unsure of issue

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Theman414, Feb 26, 2019.

  1. Theman414

    Theman414 Junior Member

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    I have a 2012 Prius with 234,800 miles on it. I recently had the care start misfiring on Cylinder 1 and 4, I have been battling a P0301 since I purchased the car. I have also noticed that when I take a hard right on a freeway on ramp the car will misfire. Here is what I have done so far and found, I have changed the spark plugs(due anyway) and swapped around coil packs, the misfire does not follow the coil packs. I have also swapped out all the injectors(with manufactured ones, still Denso injectors though).
    After all of that the car will misfire when taking a corner hard but is not logging the DTC code so I can feel the misfire but cannot yet detect which cylinder it is. Also I have a K & N air filter installed that was freshly cleaned and oiled so that should be okay.
    My question is where should I look next and does anyone have ideas of common items that I should be looking at?
    I am going to clean the MAF sensor in case the oil from the K&N filter has gotten onto it and affected it in anyway but other than that I am not certain, it has improved for certain with what I have done but does not seem to be gone just yet.
     
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  2. JC91006

    JC91006 Senior Member

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    Many have reported issues with blown head gaskets, causing misfire symptoms.
     
  3. Theman414

    Theman414 Junior Member

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    I am currently not losing any coolant or oil though, that would still be possible?
     
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  4. JC91006

    JC91006 Senior Member

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    If you're not losing any coolant, then you are probably OK. But misfiring can be caused by an overheating engine, causing head gasket issues.

    Since you've changed the spark plugs, tested the coils, replaced injectors, then you'll just have to make sure those are all working correctly. When the plugs come out again, you may want to do a compression test.
     
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  5. tankyuong

    tankyuong Senior Member

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    Egr circuit is clogged
     
  6. Theman414

    Theman414 Junior Member

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    You don't by chance have a link or something to show me how to clean it do you?
     
  7. tankyuong

    tankyuong Senior Member

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  8. tankyuong

    tankyuong Senior Member

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    And this
     
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  9. Grit

    Grit Senior Member

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    Can I get a cheese burger with large fries?
     
  10. Theman414

    Theman414 Junior Member

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    I am curious before I tear that all apart how would that cause a misfire? I am going to clean everything because those videos were enough to prove how nasty that stuff becomes. I am not very familiar with that system though and I am curious how that would cause the misfires I am seeing? Thank you for helping me with this
     
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  11. Pluggo

    Pluggo Senior Member

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    Just for the record, there are six different ways a head gasket can fail, and not all of them will result in lost coolant or oil. So, yes.
    upload_2019-2-28_6-13-46.png
     
  12. Raidin

    Raidin Active Member

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    Had a head gasket failure at 375k miles, and had it repaired. At around 450k miles, I am getting a misfire code for cylinder 4 along with P219A (fuel/air mixture ratio issue). I cleared the code 3 times and discovered that the CEL came back within 24 hours each time.

    My mechanic tried swapping the coil to see if it followed it the way the OP did, and luckily, it did not. I got the CEL back after about 48 hours, but only the P219A code. Reset it and it returned again the next day. Another reset and now it's been a week.
     
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  13. Raidin

    Raidin Active Member

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    Problem turned out to be clogged EGR ports in the intake manifold. A new manifold solved it.
     
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  14. Rebound

    Rebound Senior Member

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    New manifold? Really? They aren’t difficult to clean out; that’s surprising.
     
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  15. Raidin

    Raidin Active Member

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    My mechanic tried and felt it would take him too long to do it, and so the cost of the labor would go beyond the cost of a new manifold, so I just threw a new one in there and took back the old one. I will try to clean it myself and use it next time this happens, and repeat the process with the new one.
     
  16. FnRedPrius

    FnRedPrius Active Member

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    20 minutes with a pressure washer and engine cleaner and labor would be too much? What is his labor rate?
     
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  17. cnc97

    cnc97 Senior Member

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    He’s probably just not willing to do it. A parts changer most likely. Just wants to throw parts at it until the problem goes away.
     
  18. Mendel Leisk

    Mendel Leisk Sand Pounder

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    For owners intimidated by the process of extracting the EGR and/or intake manifold component, maybe a hybrid approach: work with a mechanic will to pull the items and pass them over to the owner for cleaning. As long they're ok with the car sitting for a day or three, that'd maybe help.
     
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