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Misfires

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Suspenderman, Aug 9, 2024 at 9:19 PM.

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  1. Suspenderman

    Suspenderman Junior Member

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    Have rough starts with P0303 and P0304 misfires. Replaced plugs and coil packs. No difference. Replaced fuel injectors, no difference. What next please? 2010 Prius
     
    #1 Suspenderman, Aug 9, 2024 at 9:19 PM
  2. bisco

    bisco cookie crumbler

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    #2 bisco, Aug 9, 2024 at 9:27 PM
  3. Brian1954

    Brian1954 Active Member

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    How many miles on the car?

    Research head gasket problem on a 2010 to 2015 (Gen 3) Prius.
     
    #3 Brian1954, Aug 9, 2024 at 9:27 PM
  4. Suspenderman

    Suspenderman Junior Member

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    #4 Suspenderman, Aug 9, 2024 at 9:33 PM
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    For next time, with misfire codes for specific cylinder(s), try swapping coils around first, see if code changes.

    seconded: need to know the miles.
     
    #5 Mendel Leisk, Aug 9, 2024 at 10:36 PM
  6. V Sport Wagon

    V Sport Wagon Member

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    Boroscope the cylinders after the car has sat for at least 12 hours, that will tell you all you need to know. It's leading to a head gasket though.
     
    #6 V Sport Wagon, Aug 9, 2024 at 11:06 PM
  7. Tombukt2

    Tombukt2 Senior Member

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    Use the camera like said above and look up at the mating surface of the head to the block you'll see the water droplets they're very easy to see If you just pulled the plugs and look with a magnifying glass you'll see the micro drops of water coolant mix right on the bottom of the plug that's sitting in the engine and look at all four of them can even touch your finger to the insulator and touch it to your tongue if you know what ethylene glycol tastes and smells like and whatnot there's your problem.
     
    #7 Tombukt2, Aug 10, 2024 at 8:50 AM
  8. bisco

    bisco cookie crumbler

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    gotcha
     
    #8 bisco, Aug 10, 2024 at 1:53 PM
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