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Exhaust popping at idle

Discussion in 'XJ Technical Chat' started by shamus, Jan 1, 2008.

  1. shamus

    shamus Member

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    I synched that carbs yesterday and played around with the tune a bit. I got it idling better than it has been, but occasionally there will be a popping through the exhaust. Is this due to being a bit lean?
     
    shamus, Jan 1, 2008
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  2. ArizonaSteve

    ArizonaSteve Member

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    Yep
     
    ArizonaSteve, Jan 1, 2008
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  3. shamus

    shamus Member

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    BUT
    it doesn;t backfire when accelerating... still lean?
     
    shamus, Jan 1, 2008
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  4. Ass.Fault

    Ass.Fault Active Member

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    that could be caused by a few diffrent things
    are all enrichment valves closing all the way?
    is it still too soon to have done a plug check?
    more than likely you may be lean in one of the cylinders, you do say that you have done a recent tune up?
    play with any of the mixture screws?
     
    Ass.Fault, Jan 1, 2008
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  5. shamus

    shamus Member

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    yeah, I've played with the mixture screw and got it idling really well, apart from the pop....
     
    shamus, Jan 1, 2008
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  6. ArizonaSteve

    ArizonaSteve Member

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    They never do backfire when accelerating, it's DECELERATING that's when they pop. You probably need to increase the pilot jets one size or just learn to live with the popping and you'll save gas.
     
    ArizonaSteve, Jan 2, 2008
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  7. Gbambeck1

    Gbambeck1 Member

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    What does the backfiring when decelerating mean? Mine does it...
     
    Gbambeck1, Jan 2, 2008
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  8. dburnettesr

    dburnettesr Member

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    I always thought they back fired through threw exhaust on decelerating when to rich,,,,pop threw the carb accelerating to lean,,,
     
    dburnettesr, Jan 2, 2008
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  9. Gbambeck1

    Gbambeck1 Member

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    So I take it I get to play with the mixture screws huh. YAY!
     
    Gbambeck1, Jan 2, 2008
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  10. shamus

    shamus Member

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    thats what I thought
     
    shamus, Jan 2, 2008
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  11. Alive

    Alive Active Member

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    Someone also told me that small holes in the headers or collector box can cause some backfiring
     
    Alive, Jan 2, 2008
    #11

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