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Prius 2010 cylinder 1 misfire query

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by GI HEON YUN, Aug 17, 2019.

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  1. GI HEON YUN

    GI HEON YUN New Member

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    My Prius 2010 Continuous Misfire Cylinder 1

    List of actions taken.

    1.Oil Catch Can
    2.Fuel Injector x 4 Replacement (by Remanufactured)
    3.Spark Plug x 4 Replacement (by Genuine Toyota)
    4.PCV Valve Replacement
    5.Intake Manifold Cleaning
    6.EGR Valve, Cooler Cleaning
    7. Coolant Replacement

    A total of seven have been progressed, but Misfire is continuously coming out.

    Total 93K Mile (150,000KM)

    Coolant, Engine Oil No Leak.

    Coolant Temp 194 ~ 200F

    This picture was taken after the misfire was made.

    The first picture is cylinder 1
    [​IMG]

    The rest of the pictures are cylinders 2, 3, 4 (same)

    [​IMG]

    Is the head gasket problem even if the oil and coolant are not leaking?

    Please help me
     
    #1 GI HEON YUN, Aug 17, 2019
  2. bisco

    bisco cookie crumbler

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    coils?
     
    #2 bisco, Aug 17, 2019
  3. schmuber

    schmuber Member

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    Yeah, start with swapping coils 1 and 2, then see if misfire moves to the 2nd cylinder.
     
    #3 schmuber, Aug 17, 2019
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  4. bikes4u

    bikes4u Member

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    When you unplug the electrical connector to the egr valve does it still misfire?

    Posted via the PriusChat mobile app.
     
    #4 bikes4u, Aug 18, 2019
  5. wheezyglider

    wheezyglider Active Member

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    That's a strange looking buildup on the intake valves of only cylinder 1. I'd guess that the intake valve seals are leaking in that cylinder. But I have to wonder if some kind of oil additive was used. Maybe a walnut shell cleaning would help with the misfire. (But not fix the leaking valve seals, if that's what's happening.)
     
    #5 wheezyglider, Aug 19, 2019
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  6. Pluggo

    Pluggo Senior Member

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    Total agreement. Also, be sure you are using any of the cleaner burning fuels certified as Top Tier.
     
    #6 Pluggo, Aug 19, 2019
  7. jb in NE

    jb in NE Senior Member

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    The funky buildup in cylinder 1 could be due to the misfire. If the fuel isn't burning, it will leave a residue.
     
    #7 jb in NE, Aug 19, 2019
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  8. wheezyglider

    wheezyglider Active Member

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    I like that explanation. But why isn't it getting cleaned by fuel? It's not leaving the typical clean/dirty pattern where the fuel injector's spray does and doesn't reach? And OP said fuel injectors were replaced...
     
    #8 wheezyglider, Aug 20, 2019
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  9. jb in NE

    jb in NE Senior Member

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    Fuel injectors were replaced, but the misfire remains. That means this cylinder is not burning its fuel. So you would expect this one to appear different than the firing cylinders.
     
    #9 jb in NE, Aug 20, 2019
  10. mjoo

    mjoo Senior Member

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    Were the EGR ports in the intake manifold cleaned out?

    Pixel XL ?
     
    #10 mjoo, Aug 20, 2019
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  11. GI HEON YUN

    GI HEON YUN New Member

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    The Head gasket near cylinder # 1 is out. I paid 1000 $. T.T
     
    #11 GI HEON YUN, Aug 22, 2019
  12. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Not sure what you mean. Has it been determined there's a failure of the head gasket, at cylinder #1? And it's been replaced, at a cost of $1000?
     
    #12 Mendel Leisk, Aug 24, 2019
  13. The Critic

    The Critic Resident Critic

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    Sounds like it.
     
    #13 The Critic, Aug 25, 2019
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  14. wheezyglider

    wheezyglider Active Member

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    At only 93K miles, that's a very early head gasket failure. Thanks OP for posting the resolution.
     
    #14 wheezyglider, Aug 25, 2019
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