Hone cylinders and replacing rings

Discussion in 'Gen 3 Prius Technical Discussion' started by djimbuser, Jan 1, 2025.

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  1. djimbuser

    djimbuser Member

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    Bad misfires on cylinder #4 on the third test drive of 20 miles. New Denso coils & plugs gapped to 1.0mm and the engine is now performing very well. It has more than completed the emission cycle with passing grades.
     
    #21 djimbuser, Feb 6, 2025
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  2. xliderider

    xliderider Senior Member

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    I know it was an old post, but the rod on the left is the new one, so pretty sure it's straight.

    SM-G781V ?
     
    #22 xliderider, Feb 6, 2025
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  3. rjparker

    rjparker Tu Humilde Sirviente

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    So the engine ran good for two twenty mile test drives until a plug or coil failed on test drive three?
     
    #23 rjparker, Feb 6, 2025
  4. djimbuser

    djimbuser Member

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    The first two test drives were identical route 6 mile drives. I would get Cyl#1 misfires on code reader but no engine shake, etc...

    I let my wife drive it on a 20 mile route for a work appointment and she said about halfway through the engine started shaking, etc... Once the car returned home I removed the plugs and plug #4 was wet with fuel! Since replacing the plugs and coils I've driven it about 100 miles with no misfire codes.
     
    #24 djimbuser, Feb 8, 2025
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