do i have carbon deposits?

Discussion in 'General Motoring' started by alan, Nov 27, 2004.

  1. alan

    alan Guest

    http://pg.photos.yahoo.com/ph/acfang/detail?.dir=8649&.dnm=27da.jpg&.src=ph

    this is the spark plug from a 97 integra gsr that was changed about 20k
    ago. The electrode looks fine, but I wonder if the black ring near the
    threads means anything. My car has a little bit of pinging even though
    I run 91 octane, and it has a knock sensor. I dumped some water down
    the throttle body a while ago, and I guess that didn't cure the problem.
     
    alan, Nov 27, 2004
    #1
  2. alan

    Shep Guest

    Looks normal, some carbon will migrate to the lower plug threads.
     
    Shep, Nov 27, 2004
    #2
  3. alan

    jim beam Guest

    no. the plug is fine, but high mileage. if it's pinging, try a
    different brand of gas, /after/ you've had the timing checked. if it's
    still pinging, check the knock sensor & its connection.
     
    jim beam, Nov 27, 2004
    #3
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