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spark plug question

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by acacia987, May 31, 2013.

  1. acacia987

    acacia987 Junior Member

    Joined:
    Jul 27, 2009
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    Location:
    MD
    Vehicle:
    2008 Prius
    Model:
    N/A
    the OEM plug (Denso SK16R11) has a gap of .044", the Toyota spec range is 0.039" to 0.043". do you have to adjust the gap on the OEM replacement plugs? I have read on denso's site that the iridium plugs gap should not be adjusted, and that measuring them could damage the metal contacts. So what are people doing?
     
    #1 acacia987, May 31, 2013
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Mar 8, 2008
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    Location:
    Green Valley, AZ
    Vehicle:
    2015 Prius
    Model:
    Two
    Yes, I would adjust the gap of new iridium plugs to 1.0 mm which is 0.0394".
     
    #2 Patrick Wong, May 31, 2013
  3. hesty24

    hesty24 Junior Member

    Joined:
    Feb 12, 2019
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    Location:
    San Antonio, Texas
    Vehicle:
    2007 Prius
    Model:
    Five
    I bought my plugs at the dealership and I used two feelers 0.53 & 0.50 combined, snug fit with the feelers, both on the old and the new plugs. Talked to the parts dude and he stated that they are already pregapped and no adjustments need to be made. I checked all 4 of the plugs and got the same results 1.03 (the closest I could get to 1.00). Drove the car around and ran like a champ. 2007 Toyota Prius
     
    #3 hesty24, Feb 13, 2019
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