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Thread: alright, how does one inspect vacuum leaks?

  1. #1
    Join Date
    Dec 2003
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    Minneapolis, MN
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    Default alright, how does one inspect vacuum leaks?

    My M50 is idling rough so I think of various things to check. One of the main things is vacuum leaks. I've never had to do much work on the engine. I've replaced a few hoses with no luck. New filters, new coil packs, 10 mo old plugs. So how do you "check for vacuum leaks"? Do you just run your fingers along the hoses or spray something near them? I don't know diddly about vacuums. Thanks.

    http://www.bimmernut.com/wwwboard/e3...ges/18504.html

  2. #2
    Join Date
    Dec 2003
    Location
    Toronto, CANADA
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    Default

    Quote Originally Posted by BennyM
    My M50 is idling rough so I think of various things to check. One of the main things is vacuum leaks. I've never had to do much work on the engine. I've replaced a few hoses with no luck. New filters, new coil packs, 10 mo old plugs. So how do you "check for vacuum leaks"? Do you just run your fingers along the hoses or spray something near them? I don't know diddly about vacuums. Thanks.

    http://www.bimmernut.com/wwwboard/e3...ges/18504.html

    Do you have a propane torch? Open the valve a bit and without lighting the torch, move the nozzle end around the suspect areas. If propane gets in via a vacuum leak, the engine idle speed will change.

    Mark

  3. #3
    Join Date
    Jan 2004
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    Tampa Bay, Florida, USA
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    900

    Default

    Here's how one of my Corvette buddies does it:

    Locate all the possible vacuum leak points, then run an UNLIT propane
    torch along each point. When the engine smooths out or idle increases.. you've found your leak. Easy on the propane setting.. keep it light.

  4. #4
    Join Date
    Dec 2003
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    Toronto, CANADA
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    882

    Default

    Quote Originally Posted by MBXB
    Here's how one of my Corvette buddies does it:

    Locate all the possible vacuum leak points, then run an UNLIT propane
    torch along each point. When the engine smooths out or idle increases.. you've found your leak. Easy on the propane setting.. keep it light.

    That's a great tip!

  5. #5
    Join Date
    Dec 2003
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    baton rouge, loserana
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    6,922

    Default

    i also use carb cleaner, it's less effected by air comming from the fan
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  6. #6
    Join Date
    Jan 2004
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    1,342

    Default Agree.

    nt

  7. #7
    Join Date
    Dec 2003
    Location
    Minneapolis, MN
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    Default Cool. Thanks Guys.

    I'll get me some carb cleaner.

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