Thread: Is It Possible for a Vac Line to Self-Disconnect?

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  1. #1 Is It Possible for a Vac Line to Self-Disconnect? 
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    I was out of town for 4 days and my wife was driving my DD which is a 2000 GT. She reported that it started running rough at idle. Then the next day it ran rough and CEL/SES light came on. When I got back in town I plugged in the code checker and had 3. Looked them up on this site were several threads all mentioning vac leak as a probable cause.

    Opened up the hood.

    Stared at the motor for 15 seconds.

    Noticed that the twin vac line fitting to the left of the TPS was off. Put it back on. Cleared codes. Drove car - all is well. Began to wonder how this could have happened.

    Is there any way that the motor could backfire or similar and blow that rubber fitting off? I noticed that it doesn't have a very firm grip. 'Cause there's no way my wife was under the hood while I was gone and I doubt she's having an affair with a car guy.
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  2. #2 Re: Is It Possible for a Vac Line to Self-Disconnect? 
    Killa Bee Scottydoggs's Avatar
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    you need new vac lines, they are hard i bet and just came off over time im sure.

    you can replace that whole Y and vac lines for less then 5 bucks.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Is It Possible for a Vac Line to Self-Disconnect? 
    GT Level Member mguzzo's Avatar
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    i noticed it was running funny when we went for coffee. didn't have time to fix it though...

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    "Silver Bullet" 98 GTP Coupe: Stock, rust free, and broadsided.
    Old '98 GTP Coupe: VS Cam, 3.0, S2IC, 42.5#, TOGs, N*/LQ4, Corsa. it once ran a 13 flat
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