Spark Plug and Ignition Coil Install

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by paphillyman, Sep 28, 2023.

  1. paphillyman

    paphillyman Member

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    I have 2012 Prius 3 and figured it might be a good idea to put new spark plugs in with new Ignition Coil . I have about 66,400 miles on it but since its going on 12 yrs old I figured I better do this install. My question is : should you use dielectric grease when installing them and if so , where exactly does the dielectric grease go .
    Also I'll be using NGK (4912) ILKAR7BII Laser Iridium spark Plugs and
    Denso Direct Ignition Coil OE Quality-673-1310
    spark plugs is what Nuts About Bolts posted he used on Spark Plug Video on YouTube
    Just checking if I'm using the right material , Thank You
     
    #1 paphillyman, Sep 28, 2023
  2. Mendel Leisk

    Mendel Leisk Senior Member

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    Toyota USA says 12 years or 120k miles for the plugs. My 2 cents, use the specd Denso SC16HR11 (revised by Toyota from Owners Manual), leave the coils, and don’t use any grease. Torque is 15 lb/ft with clean/dry threads.
     

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    #2 Mendel Leisk, Sep 28, 2023
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  3. bisco

    bisco cookie crumbler

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    what happens to low mile spark plugs after 12 years?

    have you cleaned the egr circuit?
     
    #3 bisco, Sep 28, 2023
  4. Mendel Leisk

    Mendel Leisk Senior Member

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    I did mine at 12 years, and about 97K kms. They looked very similar to the new ones...
     
    #4 Mendel Leisk, Sep 28, 2023
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  5. bisco

    bisco cookie crumbler

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    good way to sell parts though
     
    #5 bisco, Sep 28, 2023
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  6. paphillyman

    paphillyman Member

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    I'm not having any troubles at all , and yes I have cleaned the EGR cooler and intake manifold and throttle body , plus installed a catch can ,just heard 120,000 miles or 12 yrs and I have a 2012
     
    #6 paphillyman, Sep 28, 2023
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  7. bisco

    bisco cookie crumbler

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    me too. if it wasn't so much work, i'd take a look at them. i'm at 87k
     
    #7 bisco, Sep 28, 2023
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    In California it’s 15 years or 150k miles? :confused:
     
    #8 Mendel Leisk, Sep 28, 2023
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  9. bisco

    bisco cookie crumbler

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    LOL, they must get better plugs :cool:
     
    #9 bisco, Sep 28, 2023
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