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Quick Question: Is there a way to visually tell if an igniton coil is bad?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by acemason, Jun 27, 2018.

  1. acemason

    acemason Junior Member

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    Question in title. I'm in the middle of changing my spark plugs. Was just wondering if there's a way to visually check if the coil is bad. I don't have a multimeter or anything.
     
    #1 acemason, Jun 27, 2018
  2. acemason

    acemason Junior Member

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    Here's a pic of them if it helps. There's some brownish copper looking residue towards the top of one of them and the bottom of two of them.
    IMG_0765.jpg
     
    #2 acemason, Jun 27, 2018
  3. tankyuong

    tankyuong Senior Member

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    not really
     
    #3 tankyuong, Jun 27, 2018
  4. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Rust stains? Dirt? Clean off the residue using isopropyl alcohol.
     
    #4 Patrick Wong, Jun 29, 2018
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    You can pull the coils, insert a spark plug, ground the plug to the engine, disconnect fuel injector electrical connections and run the engine in inspection mode, see if there's a spark. More info in the attachment.
     

    Attached Files:

    #5 Mendel Leisk, Jun 29, 2018
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