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Prius 2004 Cylinder 1 Misfiring

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by fabgo, Feb 22, 2006.

  1. fabgo

    fabgo New Member

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    Twice in a row, when I've taken a trip to Yosemite in my 2004 Prius, the M.I.L. light has come on. When I take in for service, the scantool says cylinder one is misfiring. The first time around they found some corrosion / water damage as specified in some TSB, but this time around they can't figure out what's going on.

    The only thing I can think of is that both times it happened when 1) it's cold and 2) the car is at altitude. Anyone else experiencing something similar?
     
    #1 fabgo, Feb 22, 2006
  2. Frank Hudon

    Frank Hudon Senior Member

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    Jan 11, 2004
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    tell them to change the spark plug in #1 hole. You probably had water in the spark plug tube and it shorts out the plug. Irudium plugs don't really like miss firing and quite often fail shortly after a few misses. The other thing that happens with miss fires is the cat's can't take the load of fuel dumped in them and they over heat and could have a core meltdown, plugging off the exhaust. This needs to be addressed as soon as possible.
     
    #2 Frank Hudon, Feb 22, 2006
  3. galaxee

    galaxee mostly benevolent

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    Location:
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    Vehicle:
    2005 Prius
    the ignition is a COP (coil on plug)

    suggestion: swap coils, see if the misfire moves to the other cylinder.

    well, maybe it's a suggestion for the tech if you're not comfortable tinkering under the hood.
     
    #3 galaxee, Feb 27, 2006
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