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  1. #1
    Established Member Two Rings i.am.gustav's Avatar
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    What are the symptoms of a vacuum leak

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    So today I was able to get my car smoke tested and saw that one of my vacuum hose had torn. I was wondering what are the symptoms of a vacuum leak and how does it affect the performance of the car? Thanks in advance for your inputs!
    Last edited by i.am.gustav; 06-27-2013 at 08:47 PM.

  2. #2
    Established Member Four Rings iHaveBoost?'s Avatar
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    Jul 26 2012
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    JHM'd B6 S4
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    What's a vacuum hole? I'm intrigued..

    But a vacuum leak can cause lean conditions for letting in unmetered air, as well misfires, rough idle, potential stalls and no start symptoms if the leak is large enough, and degraded performance, etc.

    You should buy a boost gauge. There is no better diagnostic instrument to have for a turbocharged car. This will tell vacuum/boost levels so you can be sure everything is on par. Also replace whatever hole you broke. Wink.

  3. #3
    Senior Member Four Rings b6Hate4's Avatar
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    Oct 27 2010
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    2010 Premium Plus A4
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    Did you smoke test it yourself? I would go for a test using compressed air, that was you can hear and feel the boost leaks. There is a guide on a4mods.com on how to do make your own tester on the cheap.
    2010 P+ A4. Ibis white 6 speed quattro. 245AWHP/ 270AWTQ 93 octane/ 60* ambient temp.



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  4. #4
    Established Member Four Rings iHaveBoost?'s Avatar
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    I made my own from $5 worth of Home Depot materials. I didn't do it quite like a4mods, I made a more simple one. But the premise is the same.

    This is only good if you have your own compressor, btw.

  5. #5
    Established Member Two Rings i.am.gustav's Avatar
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    Quote Originally Posted by b6Hate4 View Post
    Did you smoke test it yourself? I would go for a test using compressed air, that was you can hear and feel the boost leaks. There is a guide on a4mods.com on how to do make your own tester on the cheap.
    No, my uncle is a mechanic and he used the Redline Smoke Pro machine. He saw that the smoke was escaping from the hose thats connected to the pcv valve.

  6. #6
    Established Member Four Rings milan2k13's Avatar
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    Jun 09 2013
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    Quote Originally Posted by i.am.gustav View Post
    No, my uncle is a mechanic and he used the Redline Smoke Pro machine. He saw that the smoke was escaping from the hose thats connected to the pcv valve.
    If he's a mechanic just have him replace it...
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  7. #7
    Established Member Two Rings i.am.gustav's Avatar
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    Quote Originally Posted by milan2k13 View Post
    If he's a mechanic just have him replace it...
    He is but he says he wants to get the hose from Audi because it a special shaped one.

  8. #8
    Senior Member Four Rings
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    Jun 15 2011
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    08 A4 Q Stock, '58 Porsche 356A Dodge 2500 4x4 Diesel
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    Exiled.......

    Just use regular heater hose from Napa....they have a ton of hoses with different diameters and bends. No need to do what I did..which was to spend $30 on a rubber hose.

  9. #9
    Veteran Member Three Rings pa4ul's Avatar
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    Mar 20 2008
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    03 Audi A4 1.8T/ 72 Ford F-100
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    Napa hoses have saved me lots of money! Never once had a problem with them either.
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  10. #10
    Veteran Member Four Rings ADCS's Avatar
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    Jan 06 2009
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    Toronto

    Depending on the hose (some are tapered, some are T's, some have a tight radius) you may need to use the OEM piece.

    Check this out for a DIY on most of the PCV related hoses/valves: http://www.audizine.com/forum/showth...-by-a4darkness
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  11. #11
    Established Member Two Rings i.am.gustav's Avatar
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    Anyone know any symptoms to a vacuum leak?

  12. #12
    Senior Member Four Rings customa4's Avatar
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    I'm pretty sure you can get the 034 kit for a fraction of the price of OEM. There can be many symptoms as mentioned in post #2.
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  13. #13
    Senior Member Two Rings tenspeed's Avatar
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    Quote Originally Posted by i.am.gustav View Post
    Anyone know any symptoms to a vacuum leak?
    Quote Originally Posted by iHaveBoost? View Post
    But a vacuum leak can cause lean conditions for letting in unmetered air, as well misfires, rough idle, potential stalls and no start symptoms if the leak is large enough, and degraded performance, etc.
    I thought he gave a good explanation. Basically a rough idle and the engine wants to die. Sometimes giving it a little gas will keep it running.



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