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Black Sticky Tar in Exhaust?!

Discussion in 'XJ Technical Chat' started by ads1987, Jun 19, 2018.

  1. ads1987

    ads1987 New Member

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    Decided to spray a bit of Seafoam into the intake of my 82 XJ750 Maxim today to clean up a bit, and got a little more than I was expecting. There was a very sticky black tar like substance dripping out from the right exhaust pipe. I'm guessing there's a leak in the exhaust because it was dripping out from the lowest part of the pipe. My questions are:

    1) What is it?
    2) Is it normal?
    3) If it's not, what am I looking at to fix it?

    Thanks in advance!
     
    ads1987, Jun 19, 2018
    #1
  2. tabaka45

    tabaka45 Well-Known Member

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    If it is like my XJ700N exhaust it has a vent hole in the exhaust to let condensation, if any, drip out rather than rust out. Don’t know about the black stuff, but I suspect that is is just some exhaust crud loosened by the sea foam.
     
    tabaka45, Jun 20, 2018
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    ads1987 likes this.
  3. Chitwood

    Chitwood Well-Known Member

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    Sounds to me like the seafoam loosened up some carbon and that is what you are seeing coming out of the exhaust. It sounds like you basically gave it a "powertune" a practice commonly used on 2 cycle outboard engines.
     
    Chitwood, Jun 20, 2018
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    k-moe and ads1987 like this.
  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    +1. Don't worry about it.
     
    k-moe, Jun 20, 2018
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    ads1987 likes this.

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