Engine Shutter @ 45-50 Mph

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by TwoPriusInTenn, Jun 28, 2025 at 7:34 PM.

  1. TwoPriusInTenn

    TwoPriusInTenn Member

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    Greetings,

    Wife's 2010 with 428,021 miles.

    I replaced the head gasket on this car in 2019. My daughter has had it in Florida. Came down this weekend to change the oil and sparkplugs. I also cleaned the EGR Cooler. (preventative).

    When I was done, I took the car for a drive and it shuttered at 40-50 mph. I checked TechStream and tthere was misfires in Cylinders 2 and 3. Switched around the colis and Techstream is still registering misfire in Cylinder 3,

    I'm thinking the headgasket might be gone again.

    Anything else I should check before throwing in the towel on this?
     
    #1 TwoPriusInTenn, Jun 28, 2025 at 7:34 PM
    Tombukt2 likes this.
  2. Tombukt2

    Tombukt2 Senior Member

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    Nope you pretty much got it we had a persona did this twice . No fun
     
    #2 Tombukt2, Jun 28, 2025 at 7:39 PM
  3. NutzAboutBolts

    NutzAboutBolts Senior Member

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    any coolant leak? That should indicate it.

    Any cold start shutter? How are the fuel injectors? How does the spark plugs look?
     
    #3 NutzAboutBolts, Jun 28, 2025 at 11:05 PM
  4. Grit

    Grit Senior Member

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    Leak down test. If it passes throw parts at it. If it failed, trip down to head gasket replacement again.
     
    #4 Grit, Jun 29, 2025 at 4:16 AM
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