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A question from overseas: Sooted plugs!

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by Jam-ez, Oct 22, 2007.

  1. Oct 22, 2007 #1
    Jam-ez

    Jam-ez Member

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    Hello all,

    I have a small question (which of course is likely to be linked to a large problem) concerning sooting of half the spark plugs. The front 4 plugs (numbers 1,2,5,6) in my 289 HiPo are heavily sooted, whilst the rear 4 plugs (numbers 3,4,7,8) are clean.

    Under load (of my right foot) the exhaust does chuck out black soot, which I'd imagine is linked to the plug blackening.

    Does anyone have any thoughts on what could be causing the problem?

    Thanks,

    James.
     
    Jam-ez, Oct 22, 2007
    Jam-ez, Oct 22, 2007
    #1
  2. Oct 22, 2007 #2
    shelby Guy

    shelby Guy Well-Known Member

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    Hi Jamie . I had a 289 car that did the same . it was overfuelling via the choke spring adjustment on the carb !
    TRY it , THX, John
     
    shelby Guy, Oct 22, 2007
    shelby Guy, Oct 22, 2007
    #2
  3. Oct 23, 2007 #3
    427SnakeSC

    427SnakeSC Active Member

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    If you have black smoke coming out of the exhausts, it sounds like too much fuel. Running rich or choke sticking as previously suggested.:mellow:
     
    427SnakeSC, Oct 23, 2007
    427SnakeSC, Oct 23, 2007
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  4. Oct 25, 2007 #4
    Jam-ez

    Jam-ez Member

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    Thank you fellas. I'll take the advice on board. There may be an issue with the intake manifold gasket, so I'll bear it all in mind.

    Thanks again.
     
    Jam-ez, Oct 25, 2007
    Jam-ez, Oct 25, 2007
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