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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
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