Prius 2010 cylinder 1 misfire query

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

Tags:
  1. GI HEON YUN

    GI HEON YUN New Member

    Joined:
    Oct 9, 2018
    2
    0
    0
    Location:
    Seoul, Korea
    Vehicle:
    2010 Prius
    Model:
    N/A
    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

    Joined:
    May 11, 2005
    111,166
    50,601
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    coils?
     
    #2 bisco, Aug 17, 2019
  3. schmuber

    schmuber Member

    Joined:
    Oct 9, 2018
    115
    84
    1
    Location:
    Georgia
    Vehicle:
    2010 Prius
    Model:
    N/A
    Yeah, start with swapping coils 1 and 2, then see if misfire moves to the 2nd cylinder.
     
    #3 schmuber, Aug 17, 2019
    Pluggo likes this.
  4. bikes4u

    bikes4u Member

    Joined:
    Sep 8, 2015
    131
    39
    0
    Location:
    indianapolis
    Vehicle:
    2005 Prius
    Model:
    IV
    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

    Joined:
    Mar 12, 2011
    247
    178
    0
    Location:
    SF Bay Area
    Vehicle:
    2010 Prius
    Model:
    Five
    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
    Pluggo likes this.
  6. Pluggo

    Pluggo Senior Member

    Joined:
    May 23, 2016
    608
    532
    0
    Location:
    Folsom, Pennsylvania
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Advanced
    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

    Joined:
    Apr 13, 2018
    2,233
    1,598
    0
    Location:
    Nebraska
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Premium
    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
    mjoo and Pluggo like this.
  8. wheezyglider

    wheezyglider Active Member

    Joined:
    Mar 12, 2011
    247
    178
    0
    Location:
    SF Bay Area
    Vehicle:
    2010 Prius
    Model:
    Five
    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
    mjoo likes this.
  9. jb in NE

    jb in NE Senior Member

    Joined:
    Apr 13, 2018
    2,233
    1,598
    0
    Location:
    Nebraska
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Premium
    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

    Joined:
    Nov 9, 2016
    1,146
    1,326
    12
    Location:
    Michigan
    Vehicle:
    2010 Prius
    Model:
    III
    Were the EGR ports in the intake manifold cleaned out?

    Pixel XL ?
     
    #10 mjoo, Aug 20, 2019
    Mendel Leisk and Raytheeagle like this.
  11. GI HEON YUN

    GI HEON YUN New Member

    Joined:
    Oct 9, 2018
    2
    0
    0
    Location:
    Seoul, Korea
    Vehicle:
    2010 Prius
    Model:
    N/A
    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 Senior Member

    Joined:
    Oct 17, 2010
    57,960
    39,991
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    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

    Joined:
    Oct 28, 2005
    3,193
    2,325
    0
    Location:
    CA
    Vehicle:
    2011 Prius
    Model:
    Three
    Sounds like it.
     
    #13 The Critic, Aug 25, 2019
    Mendel Leisk likes this.
  14. wheezyglider

    wheezyglider Active Member

    Joined:
    Mar 12, 2011
    247
    178
    0
    Location:
    SF Bay Area
    Vehicle:
    2010 Prius
    Model:
    Five
    At only 93K miles, that's a very early head gasket failure. Thanks OP for posting the resolution.
     
    #14 wheezyglider, Aug 25, 2019
    The Critic likes this.
(You must log in or sign up to post here.)