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Idles fine, a little throttle fine, lot of throttle hangs

Discussion in 'XJ Technical Chat' started by automotivated, Jul 28, 2011.

  1. automotivated

    automotivated Member

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    Just like the subject says:

    It idles good at about 1100, give it a little bit of gas and it drops right back to idle, but when you give it mid to high amounts of throttle, it stays revved up for a few seconds maybe 5-10 unless you pop it up a gear then it drops down.

    Any clues on what could cause this?

    Thanks,
    Nick
     
    automotivated, Jul 28, 2011
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  2. Militant_Buddhist

    Militant_Buddhist Member

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    vac leak, sticky CV slides are two possible culprits. There's a few others I could dream up but they're farther fetched and not worth mentioning until checking out those two basics.
     
    Militant_Buddhist, Jul 28, 2011
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  3. automotivated

    automotivated Member

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    Re: Idles fine, a little throttle fine, lot of throttle hang

    Well everything on those bad boys is new parts so I don't think there is a vacuum leak, stick slides is probably worth checking out though. I believe somebody said in another post to clean them up with some sand paper. I did the clunk test and they passed that just fine but I did notice that when they are in the carb, #4 hangs up a little once in a while. It is worth checking out I suppose.
     
    automotivated, Jul 28, 2011
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  4. Ravenz07

    Ravenz07 Member

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    Got to work that number 4.

    Buuuuuuuut could be a sync issue. Could be a vac leak like stated. Could be your mixture is off, etc.
     
    Ravenz07, Jul 28, 2011
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  5. automotivated

    automotivated Member

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    Re: Idles fine, a little throttle fine, lot of throttle hang

    I have noticed that when I tinker with the carb sync screws that it changes. So maybe it is just a sync issue or a combination of things. Im going to try to sync them up. Is there a way to kind of sync them up while they are on the bike? It is completely stock, nothing aftermarket at all.
     
    automotivated, Jul 29, 2011
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  6. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    You don't "kind of" sync them up on the bike; that IS the final step in carb sync: a running vacuum sync. With YICS blocked, if applicable. A bench sync is only a starting point; but you also need to check the float levels.

    AFTER you put the valve clearances in spec.
     
    bigfitz52, Jul 30, 2011
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