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Combustion Test ok but still misfiring??

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Levi Gonzalez, Dec 17, 2021.

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  1. Levi Gonzalez

    Levi Gonzalez Junior Member

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    Four
    now currently I have codes for 300 301 302 303 AND 304.

    sound like a head gasket issue?
     
    #21 Levi Gonzalez, Dec 21, 2021
  2. Levi Gonzalez

    Levi Gonzalez Junior Member

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    can a PVC or Fuel filter cause misfires?
     
    #22 Levi Gonzalez, Dec 21, 2021
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    Did you do leak-down test?
     
    #23 Mendel Leisk, Dec 21, 2021
  4. ChapmanF

    ChapmanF Senior Member

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    Not so sure about the PCV; fuel filter for sure, if the misfiring is in circumstances of high demand and the fuel delivery can't keep up.

    Have you read the article linked in #16, in particular where it gives you ways of focusing on the conditions when the misfires are most pronounced?
     
    #24 ChapmanF, Dec 21, 2021
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