Car knocking, changed spark plugs, problem persists

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Jacob Bonner, Feb 7, 2019.

  1. Jacob Bonner

    Jacob Bonner New Member

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    So I've had a knocking sound for the past several weeks. I replaced the spark plugs but that did not take care of the issue. Today, while knocking, the engine light came on so I had it plugged up to read the code and it read that the 2nd cylinder is misfiring. I'm considering replacing the ignition coil next (a $80-100 fix), but I've seen videos on YouTube of people just replacing the boot (a $10 fix) and that solving the problem. I can do the work myself, but what I am not sure about is how to go about finding the specific boot replacement. As far as I know, the ignition coils are original.
     
    #1 Jacob Bonner, Feb 7, 2019
    Last edited: Feb 7, 2019
  2. tankyuong

    tankyuong Active Member

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    I would replace the whole coil
     
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  3. NutzAboutBolts

    NutzAboutBolts Senior Member

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    Swap the ignition coil to see if it persist
     
  4. Raytheeagle

    Raytheeagle Senior Member

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    How many miles on your Prius?

    Ever clean the egr circuit?

    Install an oil catch can?

    Good luck and keep us posted (y).
     
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  5. Jacob Bonner

    Jacob Bonner New Member

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    It's a 2012 and has 173,000 miles. I've not cleaned the EGR valve since I've owned it (I bought it at 154,000 miles in 2017). It does not have an oil catch can that I am aware of.

    As for ignition coils, are there preferred brands? If looking at brands like Delphi, Denso or NGK they are about $90 a piece. However, on eBay I'm seeing them in the $40 range for complete sets, but this seems suspicious to me... I'd certainly love to save money, but I don't want to put junk in my car either.
     
  6. Raytheeagle

    Raytheeagle Senior Member

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    I’d start with an egr circuit cleanse before doing any purchasing of new coils ;).

    That’s essentially free (other than your time) unless you will be buying new gaskets.

    Good luck and keep us posted (y).
     
    #6 Raytheeagle, Feb 9, 2019
    Last edited: Feb 9, 2019
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  7. frodoz737

    frodoz737 Top Wrench

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    Similar to post #3...swap #2 COP with another position and see if it follows first.
     
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  8. Jacob Bonner

    Jacob Bonner New Member

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    So last night (30 degree weather), I was driving to town and had the heat on (it takes a lot longer to heat up the car than it use to - now it takes a good 15 minutes to feel any warmth, at least), the coolant temperature warning light came on. The coolant level is slightly lower than it was when I filled it to the full line about a week ago (though it was warmer when I filled it). It's still just above the low line (it's awfully difficult to see between the full and low line, due to the casing.. not sure why they did it like that). Perhaps I have multiple problems? I'm looking up videos on EGR cleaning.. will update everyone when I finish that. I'll also look into an oil catch can at some point. Will change the ignition coil if EGR cleaning doesn't work. Thanks
     
  9. Raytheeagle

    Raytheeagle Senior Member

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    The coolant light coming on is a bad sign:(.

    Do you have a way to monitor engine temps? To me (based on your description), it sounds like the thermostat and or the water pump are bad;).

    I’d mark the level for your future reference to ensure it isn’t losing coolant as that’ll signal a much larger issue(y).
     
  10. Kenny94945

    Kenny94945 Active Member

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    FWIW...I did not read where the OP stated the knocking was at idle, while cruising,
    or under load.

    Does state there was a computer code for cylinder two misfire.

    OP changed their spark plugs.

    Car has about 175K mileage.

    1) Did cylinder 2's spark plug look like the other 3?
    2) Typically knock is timing issue and can be related to octane/ fuel quality.
    Can also be related to excess carbon build up in the combustion chamber.
    3) Cleaning the ERG is a know Prius maintenance procedure...best guess.
    4) Swapping coils to see if the computer code swaps to another
    cylinder is also best diagnostic advice.
    5) If trying to save money, can a single spark plug wire be purchased?
    In other words, maybe a wire and not the coil.
    6) E-bay clone coils for $40 a set vs. name brand at $90 each.
    I don't know to say other than if it was me, I would replace with OEM Toyota.

    Good luck.
     
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  11. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    There coils are right at the spark plugs, no wire.
     
  12. Salumi

    Salumi New Member

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    Hello bonner
    What year is the car
    And is antifreeze reducing too ??
     
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