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Thread: Spark Plugs

  1. #1
    Join Date
    Jun 2022
    Posts
    22

    Default Spark Plugs

    Changing spark plugs in my new-to-me 2002 Outback LS and want to get thoughts on the old plugs. I have no idea how old they are so I want to swap them anyway, but these look pretty dark.

    The thermostat was stuck open when I purchased the boat and temp gauge would only get to about 130. The thermostat has been replaced and temp is now 160. Would the lower temp cause this coloration? It looks wet on the plugs, but appears dry when I wipe them off onto a rag.
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  2. #2
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    1,251

    Default

    They look a little rich. A cold engine would run rich naturally so that would explain that.
    Nothing looks off based on the Plugs you have pictured.

    A couple look dark like you have some oil blow-by. If you were worried, you could check compression to see what your range is on all 8 cylinders. Doesn't look unusual if these haven't been changed in many hours of use.
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  3. #3
    Join Date
    Mar 2003
    Location
    Springfield Missouri
    Posts
    3,391

    Default

    If you don't have engine issues, I would recommend replacing the plugs and checking them at the end of the season. Be sure to get the correct plugs that are listed for that engine.
    1998 Mobius
    310 HP PCM
    SOLD

  4. #4
    Join Date
    Apr 2013
    Location
    Knoxville TN
    Posts
    3,065

    Default

    Check the wires and cap too if you do not know the maintenance history.


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    2018 Supra SL400

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