Spark plug emergency

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by pk123, Jun 19, 2025 at 3:43 PM.

  1. pk123

    pk123 Member

    Joined:
    Oct 21, 2019
    35
    29
    0
    Location:
    Washington
    Vehicle:
    2010 Prius
    Model:
    II
    So this is interesting. I purchased a 9/16” spark plug socket and the rubber stopper appears to have remained stuck around one of the plugs. It’s wedged in there now and I can neither get the socket back on the plug hex nor place the ignition coil. Any suggestions?

    Image of the socket below.
     

    Attached Files:

  2. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
    12,075
    2,134
    0
    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    Yes I use mag sockets about ten yrs now . Usually a still round dowel like from home Depot it's metal 5 16 comes to mind you stick it down and you get it in between the plug rubber and the
     
    pk123 likes this.
  3. pk123

    pk123 Member

    Joined:
    Oct 21, 2019
    35
    29
    0
    Location:
    Washington
    Vehicle:
    2010 Prius
    Model:
    II
    Thanks…I eventually managed to finagle it out with a metal pick. Apologies for the panicked post!
     
  4. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    7,146
    3,736
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    Take it back and get the magnetic none

     
  5. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    58,828
    40,506
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    It’s good to tape the socket to the extension too: the internal rubber grip can be tenacious enough to leave the hole socket down the hole, which typically means you’ve got to back the plug out, to rectify.

    I persevere with that style of socket, but I see a lot of mechanics use a plain socket, then fish plugs out with magnetic wand.

    I believe 14mm is the proper size, but 9/16” is close. I’m using the latter.
     

    Attached Files:

    #5 Mendel Leisk, Jun 20, 2025 at 10:16 AM
    Last edited: Jun 20, 2025 at 10:22 AM
    CR94 likes this.
  6. Siward

    Siward Active Member

    Joined:
    Aug 7, 2014
    312
    126
    10
    Location:
    Toronto
    Vehicle:
    2012 Prius
    Model:
    Three
    I am a newbie and was afraid of ever losing the spark plug socket, so I use lockable extensions:
    General PDP Template | Canadian Tire
    https://a.co/d/8wagICv

    Well, I bought them when they were on sale for $14 years ago. They are indeed expensive. I also have a larger magnetic pickup wand as a 2nd backup.

    I also buy the spark plug socket that is magnetized. I guess it is recommended to check for any loose spark plug socket rings prior to starting the job.
     
    #6 Siward, Jun 23, 2025 at 4:45 PM
    Last edited: Jun 23, 2025 at 4:53 PM
  7. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    58,828
    40,506
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    I've left the socket down the hole, on the newly installed spark plug. Thought about if a few seconds, backed the plug back out, taped up the extension/socket joint, reinstalled the plug.
     
  8. BiomedO1

    BiomedO1 Senior Member

    Joined:
    Mar 27, 2021
    2,734
    1,459
    0
    Location:
    SacTown, Ca
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    The trick with those rubber plugs, in the socket. Pull them out and glue them in. Silicon tub caulk works great, as long as the socket is clean and oil free.
    When using them with spark plugs, a bit of dielectric grease on the plug and slide it into the socket ONE notch - you'll feel it. DO NOT press it down any further! Hand tighten and torque down without applying any downward pressure. They should pop out without incident.

    Hope this helps...

    FWIW; if you just put some dielectric grease on the plugs top tip, should reduce the chances of losing that stopper.
     
  9. Carall

    Carall Member

    Joined:
    Apr 22, 2023
    233
    55
    0
    Location:
    Harrisonburg, VA
    Vehicle:
    2012 Prius
    Model:
    V
  10. NutzAboutBolts

    NutzAboutBolts Senior Member

    Joined:
    Mar 5, 2013
    1,527
    1,623
    0
    Location:
    Bay Area
    Vehicle:
    2012 Prius
    Model:
    Four
    For those that don’t have the magnetic socket. Just use a regular 14mm socket for the spark plug, then use a magnetic pick up tool to take the spark plugs out.