Hesitation/shuttering

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by n4in, Feb 5, 2019.

  1. n4in

    n4in Junior Member

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    2018 Prius
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    Three Touring
    Today when driving to work with thick fog, about 12 mile one way drive, twice during the drive the ICE started hesitating/shuttering. When I would take my foot off the accelerator the Prius would go into EV mode and the hesitating/shuttering would immediately stop. Did not do any of this on way home this afternoon. Anyone else experienced anything like this? My Prius is 2018 with 8400 miles, and has driven perfectly since I bought it in August.
     
  2. JC91006

    JC91006 Senior Member

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    sounds like your car is under warranty, if it persists, just bring it in and let them address it.
     
  3. bisco

    bisco cookie crumbler

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    not that i have read. maybe some bad gas, if you can replicate it, agree with above
     
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  4. The Professor

    The Professor Senior Member

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    There's a thread on here somewhere that details the stages the vehicle goes through while it's warming up. If I recall (and I've experienced this too) there is a stage where it is much more rough / shuddery compared to even when it's starting from cold. Weirdly, this stage comes towards the end of the warmup routine, so it's like the car is a bit shuddery when completely cold, then it gets better, then it gets much much worse, then it's all smooth. These stages will all be prolonged during colder weather. Could it just be that? Or is it still happening after, say, 10 minutes of driving?
     
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  5. n4in

    n4in Junior Member

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    Location:
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    Vehicle:
    2018 Prius
    Model:
    Three Touring
    Mystery solved, under the silver plastic engine cover was a mouse nest and the number 3 spark plug coil wires were bare with insulation exposed and shorting out each other causing misfire of that cylinder, engine code P0303. Removed mouse nest, isolated wires and covered with silicone heat resistant tape and cleared code. Runs fine now, at least so far.
     
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