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Finding and treating an exhaust leak in 4th gens.

Discussion in '4th Gen 4Runners (2003-2009)' started by Benny123, Jul 20, 2019.

  1. Jul 20, 2019 at 7:56 AM
    #1
    Benny123

    Benny123 [OP] Long term owner

    Joined:
    Mar 4, 2019
    Member:
    #9045
    Messages:
    138
    Gender:
    Male
    Charlotte, NC
    Vehicle:
    2007 V6 SR5 4WD Galactic Gray Mica
    Stock
    Drove to breakfast this am and heard more noise than typical. I guessed exhaust leak and did this Chrisfix test with a shop vac.

    https://youtu.be/N-exs1iMLFU

    I felt the leak with my hand immediately. I could hear the vac, and got soapy bubbles here. It is right under this piece of metal. I can feel it and rest of exhaust is not leaking. But area behind it is too small to see clearly.

    IMG_20190720_104650.jpg


    Question is can I grind off this piece/flap?
    Is it necessary? It doesnt attach to anything but the exhaust pipe. It looks like it has 2 spot welds. I would cut about 1/2 inch above them, avoiding further damage to the pipe. I cant see behind it but I know the leak is there. Then going to use JB weld exhaust putty, as shown in Chrisfix video.

    More pics to show location, near rear of passenger front door.
    IMG_20190720_104638.jpg IMG_20190720_104629.jpg
     

    Attached Files:

    Last edited: Jul 20, 2019
  2. Jul 20, 2019 at 11:19 AM
    #2
    Benny123

    Benny123 [OP] Long term owner

    Joined:
    Mar 4, 2019
    Member:
    #9045
    Messages:
    138
    Gender:
    Male
    Charlotte, NC
    Vehicle:
    2007 V6 SR5 4WD Galactic Gray Mica
    Stock
    Well I took a chance and ground it off. You can see the hole & crack near lower weld. Additionally there there is a fissure closer to the weld. There is also one above but hard to get on camera.

    The welds are clearly weak points. If youve got an exhaust leak check here.

    JB welded both areas and used a heat gun. 100°F in Charlotte. Now we wait.
    IMG_20190720_115634.jpg IMG_20190720_121214.jpg
     
  3. Jul 21, 2019 at 11:00 AM
    #3
    captsolo

    captsolo New Member

    Joined:
    Jun 2, 2019
    Member:
    #10131
    Messages:
    65
    Gender:
    Male
    First Name:
    Tom
    nassau bahamas
    Vehicle:
    2005 SR5
    I haven't had much luck with patching exhaust leaks in my previous cars. Luckily my 2005 4runner exhaust is still looking strong.

    The only exhaust stop leak in the Chrisfix video that would work IMO is the metal sleeve with the two bolts.

    Wouldn't cutting out 3 inches of leaking pipe, and welding in a new 3-1/2s of pipe work better?
     
  4. Jul 21, 2019 at 11:30 PM
    #4
    Dillusion

    Dillusion New Member

    Joined:
    Dec 10, 2018
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    #7998
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    Male
    First Name:
    KYle
    Vehicle:
    2018 TRD OR
    Covering the rust is only a temp fix.

    You gotta get rid of the cancer to stop it.
     

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