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Thread: New 'stumble' at idle, in gear

  1. #1
    mckellyb is offline Cadillac Owners Enthusiast
    Automobile(s): 2005 STS N*, 1SF, 144K mi.
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    New 'stumble' at idle, in gear

    I noticed this, yesterday, a couple of times. While sitting at a stoplight, my N* 'stumbles'. Idles just fine, then, without any prompting it the idle drops a lot, it coughs a little, and catches itself, so it doesn't stall. Lasts only a second, but it's as if the fuel supply is cut off for just a moment.

    Not one problem, otherwise. MPG is fine, performance is great...I'm baffled.

    Ideas?


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  3. #2
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Vacuum leak


    Check intake manifold bolts

  4. #3
    BlueAngel#07's Avatar
    BlueAngel#07 is offline Cadillac Owners Connoisseur
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    Check air filter

  5. #4
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: New 'stumble' at idle, in gear

    Ditto, intake manifold.
    Don't mess with Binky Bear!


  6. #5
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: New 'stumble' at idle, in gear

    Got it, intake manifold bolts.

    I checked those not 20K miles ago. Oh, well, might need it again.

    It's not the air filter, I know that for a fact.

  7. #6
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Re: New 'stumble' at idle, in gear

    Maybe you over tightened them last time and now you're paying for it. Or they came loose again.

  8. #7
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Remove one by one blue lock tite retorque problem gone.

  9. #8
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: New 'stumble' at idle, in gear

    Nah, I was careful to not over-torque.

    Thanks, 1BadCadSTS, I'll have to do that. I've been meaning to get some Locktite which doesn't require heat to remove, anyway.

  10. #9
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by mckellyb
    Nah, I was careful to not over-torque.

    Thanks, 1BadCadSTS, I'll have to do that. I've been meaning to get some Locktite which doesn't require heat to remove, anyway.
    Make sure you get BLUE not RED.

  11. #10
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: New 'stumble' at idle, in gear

    Quote Originally Posted by 1BadCadSTS View Post
    Make sure you get BLUE not RED.
    Oh, I know! I have some red I've had for years. I use it very, very sparingly.

  12. #11
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by mckellyb

    Oh, I know! I have some red I've had for years. I use it very, very sparingly.
    Only thing I've used red loctite on was the cam gear bolts on my LS2. Can't recall anything else I've needed that for.


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