1. Attachments are working again! Check out this thread for more details and to report any other bugs.

2010 w/ 219,000 and cylinder 2 misfire

Discussion in 'Gen 3 Prius Main Forum' started by Azlandshaper, Sep 14, 2019.

  1. Azlandshaper

    Azlandshaper Junior Member

    Joined:
    Mar 5, 2018
    17
    12
    0
    Location:
    Old Pueblo
    Vehicle:
    2010 Prius
    Model:
    Four
    My 2010 Prius has 219k on the odometer and has a cylinder 2 misfire. Ive replaced the plugs 5k ago and cleaned the EGR setup two weeks ago. I also swapped the coils between 1 and 2 and the misfire remains at cyl 2. I ran techtron through with the last tank of fuel and while I feel it may have been somewhat effective while in the tank the new tank of fuel is experiencing a serious misfire upon acceleration. This seems odd considering the stuff is suppose to clean injectors and isnt really a fuel enhancement. The car has used oil at a rapid rate for the last three years despite this it has run well and I was getting 40-45mpg until quite recently. Now getting 37-38.

    Id like to hear what the prius gurus say. Im thinking Ill pull the injectors and have them cleaned at a local injector/ carburator shop for $40 ea and cross my fingers that improves things. Anything else I should be looking at before I commit to a new head gasket or more likely an engine swap to a 2015??? Or while I have the cowling off? Also Is it necessary to pull the EGR setup again to do the injector process (that was time consuming) ?
     
  2. The Critic

    The Critic Resident Critic

    Joined:
    Oct 28, 2005
    3,193
    2,315
    0
    Location:
    CA
    Vehicle:
    2011 Prius
    Model:
    Three
    Did you clean the intake manifold completely?
     
    Raytheeagle and Mendel Leisk like this.
  3. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    54,467
    38,101
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    With 219K miles, you've just now cleaned the EGR, and those symptoms, looks like failing head gasket.

    Is the engine coolant level stable?

    To check for head gasket: failure, you could try a leak-down test, and the test for exhaust gasses in coolant. (UView 560000 is one tester I see, for the latter.)



     
  4. Azlandshaper

    Azlandshaper Junior Member

    Joined:
    Mar 5, 2018
    17
    12
    0
    Location:
    Old Pueblo
    Vehicle:
    2010 Prius
    Model:
    Four
    Coolant levels are stable as of the last 500 miles. Cleaned entire intake when I did the manifold replacement. Read a little more and its not needed to do the EGR system removal to do the fuel injectors.
     
    Mendel Leisk likes this.
  5. Azlandshaper

    Azlandshaper Junior Member

    Joined:
    Mar 5, 2018
    17
    12
    0
    Location:
    Old Pueblo
    Vehicle:
    2010 Prius
    Model:
    Four
    Man I drove 400 miles today and not a sign of an issue. Tomorrow may be different. Checked the coolant again today and its been stable for over 1k miles now. Looking into the injectors this weekend.
     
    Mendel Leisk likes this.
  6. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    54,467
    38,101
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
  7. Azlandshaper

    Azlandshaper Junior Member

    Joined:
    Mar 5, 2018
    17
    12
    0
    Location:
    Old Pueblo
    Vehicle:
    2010 Prius
    Model:
    Four
    After having the injectors cleaned we seem to be off to a good start. THe engine runs with more pep and (knock on wood) no hesitation or check engine lights. Fingers crossed we move forward.

    There was no need to remove the EGR and the worst part of the job was the damn screw that secures the fuel rail behind the EGR cooler. Aside from that this is an easy job. If your familiar with removing the wipers and associated BS then this is a 2 hour job for an experienced wrench. Cost of injector flush was $140 at a local shop where they told me two of the injectors were barely passing fuel.

    Fingers crossed. Zoom zoom!
     
    MikeV, mikey_t and Mendel Leisk like this.
  8. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    54,467
    38,101
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    I'm curious when you disconnect the fuel rail, what measures did you take to release pressure, if any.

    IIRC Repair Manual says to remove the rear seat, access the fuel pump and so on, which seems really onerous. Just wrap the connection in a towel when disconnecting?
     
  9. Azlandshaper

    Azlandshaper Junior Member

    Joined:
    Mar 5, 2018
    17
    12
    0
    Location:
    Old Pueblo
    Vehicle:
    2010 Prius
    Model:
    Four
    I did pull the back seat and disconnect the pump so i could bleed down the pressure w the least mess and fire danger possible. After running it out of fuel i did the rag and around the fuel rail trick w little success. Fuel pours out of each of the 4 holes so theres not much other than a bag thats going to catch the runoff.
     
    Mendel Leisk likes this.
  10. 2012 Prius v wagon 3

    2012 Prius v wagon 3 Active Member

    Joined:
    Sep 12, 2019
    281
    276
    0
    Location:
    Redwood City, California
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    I'm not sure how it works on these cars, but on most cars the procedure is to get the car idling (maintenance mode required?), pull the fuel pump fuse(s), allowing any pressure to dissipate while the engine dies. Then loosen the gas cap (and leave it that way until you're done) so any vapor pressure in the tank is not trying to force fuel out once you open up the fuel line. Then disconnect the battery so you don't blow anything up. And of course even after all that, some fuel will still spill, so be prepared and work quickly.
     
    pingd and Mendel Leisk like this.
  11. MikeV

    MikeV Junior Member

    Joined:
    Nov 22, 2020
    95
    20
    0
    Location:
    philadelphia
    Vehicle:
    2010 Prius
    Model:
    Three
    can you update us having similar issues and having a mechanic come out in 2days and trying to absorb as much knowledge as i can before throwing a bunch of monet at a 2010 with 188k. love the car but it has been through alot too.