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Green residue on spark plugs?

Elk creekElk creek Senior MemberPosts: 7,413 Senior Member
I changed the coil pack and spark plugs in the Jeep today. I had a misfire code thrown at me. All went well after I got the dang clip to releases the coil pack. After pulling the plugs and replacing them one had a green residue on it. What is that from? The others looked worn but normal.  All in all it was a fun project, and the Jeep is running great! 
Aim higher, or get a bigger gun.

Replies

  • TugarTugar Senior Member Posts: 2,435 Senior Member
    From my limited experience(compared to others), I have two thoughts. You need one step colder plug as overheating is burning off the outer coating exposing the copper. OR, pull the O2 sensor and pray that isn't green meaning your might be burning coolant.

    Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery.
    Winston Churchill
  • Elk creekElk creek Senior Member Posts: 7,413 Senior Member
    Tugar said:
    From my limited experience(compared to others), I have two thoughts. You need one step colder plug as overheating is burning off the outer coating exposing the copper. OR, pull the O2 sensor and pray that isn't green meaning your might be burning coolant.

    Interesting, could be too hot. I’m running orange coolant so I doubt its that. Thanks I appreciate it. 
    Aim higher, or get a bigger gun.
  • earlyagainearlyagain Posts: 7,928 Senior Member
    Coolant would likely show up on your dip stick if there were enough to be on the electrode. Could be something in the fuel as purchased, but that's a wasg on my part.
  • GilaGila Posts: 1,908 Senior Member
    Tugar said:
    From my limited experience(compared to others), I have two thoughts. You need one step colder plug as overheating is burning off the outer coating exposing the copper. OR, pull the O2 sensor and pray that isn't green meaning your might be burning coolant.

    Yeah, copper turns green when it oxidizes.
    No good deed goes unpunished...
  • RaftermanRafterman New Member Posts: 339 Member
    Maybe someone used a little too much copper based anti seize on the threads last time? WAG.
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