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Help - Fouled Plugs Problem

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1986Blazer, Sep 10, 2001.

  1. 1986Blazer

    1986Blazer 1/2 ton status

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    New problem. I have the timing perfect now but the plugs keep fouling - bad carbon buildup, a few plugs are wet (possibly too much gas and it is not completely burned during combustion). I have been through a few sets of plugs. The engine start great in the morning but after it is warm, it starts but blows some black smoke for a few seconds (not that much smoke but some). I figure the carb is rich. If so would this cause the fouled plugs? I am going to adjust the carb but would like some input before I do so just incase there may be more things to do.

    <a target="_blank" href=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</a>
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     
  2. DMK

    DMK 1/2 ton status

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    Also check float level, lose cover screws, stuck or inopretive choke. If carb has alot of miles maybe time for rebuild.
     
  3. BigTex

    BigTex 1/2 ton status

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    What gas do you use? Mine ALWAYS foul up when I use regular unleaded. Also, if you are adding any additives to your fuel, they also cause deposits on the plugs. I used to have that problem. Running super-unleaded is the best for my truck.

    <font color=red>"Maybe you could drive better with that cell phone up your azz?!!!"</font color=red>
     
  4. BorregoK5

    BorregoK5 1/2 ton status

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    Is this a fresh motor, if so, a quench gap above .035" can cause carbon and hot spots in the combustion chamber at normal operating temperature. Are you pinging under load?

    What, Me Worry?
     
  5. TwoCrowsDesign

    TwoCrowsDesign 1/2 ton status

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    Possible bad oxygen sensor? Worth looking at, I suppose

    John
     
  6. 1986Blazer

    1986Blazer 1/2 ton status

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    OK, thanks.

    No 02 sensor, the carb has been rebuilt, I have used some additives but only in one or two tanks.

    Will a lean mixture cause this problem????





    <a target="_blank" href=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</a>
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     

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