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    dfuller0227's Avatar
    dfuller0227 Posts: 77, Reputation: 1
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    #1

    Oct 22, 2012, 03:36 PM
    Carbon deposit on spark plugs
    My spark plugs has carbon deposits on them and its. Causing my car to misfire, stutter and hard start what can I do to fix this problem ?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Oct 22, 2012, 04:05 PM
    Most carbon is a by-product of oil being burned, such as from leaking valve seals, valve guides, or rings.
    dfuller0227's Avatar
    dfuller0227 Posts: 77, Reputation: 1
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    #3

    Oct 22, 2012, 04:20 PM
    Are you talking about the valve seals and rings on the valve cover gasket if so I had already change them when I changed my valve cover gasket
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #4

    Oct 22, 2012, 04:50 PM
    No. I'm talking about the seals on the valves themselves and their corresponding valve guides. The rings I'm referring to are piston rings.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #5

    Oct 22, 2012, 05:41 PM
    How old are the plugs? You could try going up a step in the heat range to a hotter plug. According to NGK, carbon fouling is the most common problem with a plug that is too cold.
    dfuller0227's Avatar
    dfuller0227 Posts: 77, Reputation: 1
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    #6

    Oct 23, 2012, 01:34 AM
    Quote Originally Posted by ma0641 View Post
    How old are the plugs? You could try going up a step in the heat range to a hotter plug. According to NGK, carbon fouling is the most common problem with a plug that is too cold.
    I buy plugs like every week to 2 weeks when I first get the plugs it cranks right up but after a couple days its hard to start especially if I have the ac or heat right before I start it then it really misfire and hard to start
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #7

    Oct 23, 2012, 05:29 AM
    Quote Originally Posted by dfuller0227 View Post
    I buy plugs like every week to 2 weeks when I first get the plugs it cranks right up but after a couple days its hard to start especially if I have the ac or heat right before I start it then it really misfire and hard to start
    If it that short a time
    Then it sounds like you have internal issues. Have you done a compression or cylinder bleed down check? Good fat spark? Vacuum check?
    dfuller0227's Avatar
    dfuller0227 Posts: 77, Reputation: 1
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    #8

    Oct 23, 2012, 08:12 AM
    Quote Originally Posted by ma0641 View Post
    If it that short a time period
    Then it sounds like you have internal issues. Have you done a compression or cylinder bleed down check? Good fat spark? Vacuum check?
    I never did a compression check I never heard of a cylinder bleed down check it has good spark I checked that and I checked for a vacuum leak and there was none ill take it to a shop and have a compression check done and ill ask about the cylinder bleed down check
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