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2010 prius cylinder 2 misfire

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Priusprofit, Aug 30, 2018.

  1. Priusprofit

    Priusprofit Member

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    Hey PC, my 2010 prius has 192k miles and has an intermittent misfire.

    About 1 in 5 times that the engine turns on it misfires so bad that it sounds like the engine is blown and about to die.

    The other 4 times out of 5 it runs smooth from idle to 2500rpm it runs like new.

    All I have to work with is a code for cylinder 2 misfire.

    Oil is at good level and looks good, coolant is at good level and looks good.

    Any helpful advice before I go down the diagnostic list?

    Posted via the PriusChat mobile app.
     
    #1 Priusprofit, Aug 30, 2018
  2. audiodave

    audiodave Active Member

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    Injector or coil. How old plugs? That's the cheapest to change first. Could swap coils to see if it changes cylinder.

    Posted via the PriusChat mobile app.
     
    #2 audiodave, Aug 30, 2018
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  3. cnc97

    cnc97 Senior Member

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    Start with plugs and the coil. Clean EGR cooler, piping, and intake manifold. If that doesn’t cure it, then run a compression test.
     
    #3 cnc97, Aug 30, 2018
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  4. Mendel Leisk

    Mendel Leisk Senior Member

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    The easiest part of the EGR circuit to remove and check is the "pipe", watch @NutzAboutBolts video #16 here:

    Nutz About Bolts Prius Maintenance Videos | PriusChat

    If you've not heard of EGR, never touched it before, with 192K miles it it'll very likely be getting pretty clogged.

    If so, from there I'd proceed to a full EGR cleaning, intake manifold cleaning and OCC install. There's videos on those too, same location.
     
    #4 Mendel Leisk, Aug 30, 2018
    bisco, m.wynn, NutzAboutBolts and 1 other person like this.
  5. bisco

    bisco cookie crumbler

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    Whatever happened?
     
    #5 bisco, Oct 31, 2018
  6. Priusprofit

    Priusprofit Member

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    I changed all 4 spark plugs and it seemed to run a bit better but problem was not resolved, then I followed instructions from the video above on cleaning the EGR and that made a world of a difference. About 8k miles driven since then it only misfires for about 5 seconds on a cold start.

    Posted via the PriusChat mobile app.
     
    #6 Priusprofit, Oct 31, 2018
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  7. bisco

    bisco cookie crumbler

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    Congrats!
     
    #7 bisco, Oct 31, 2018
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    Not quite out of the woods? Did you clean the intake manifold too? There's EGR passages in there too. Video on that at the same location.

    Quote from @Ragingfit :

    Well we're not out of the woods yet, but uh, certainly feeling ok about it... Starting to like the woods.
     
    #8 Mendel Leisk, Oct 31, 2018
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  9. xerox6135

    xerox6135 Member

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    I am still saying head gasket is leaking into the combustion Chambers

    Posted via the PriusChat mobile app.
     
    #9 xerox6135, Oct 31, 2018
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  10. Priusprofit

    Priusprofit Member

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    My memory says that I did but it's possible I overlooked it.

    Posted via the PriusChat mobile app.
     
    #10 Priusprofit, Oct 31, 2018
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  11. Priusprofit

    Priusprofit Member

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    My memory says that I did but it's possible I overlooked it.

    Posted via the PriusChat mobile app.
     
    #11 Priusprofit, Oct 31, 2018
  12. bisco

    bisco cookie crumbler

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    Wouldn’t there be symptoms?
     
    #12 bisco, Oct 31, 2018
  13. Priusprofit

    Priusprofit Member

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    I suppose it could be possible but no other symptoms of head gasket failure, time will tell.

    Posted via the PriusChat mobile app.
     
    #13 Priusprofit, Oct 31, 2018
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