Exhaust leak test

Discussion in 'GM Powertrain' started by spirentc, Feb 24, 2008.

  1. spirentc

    spirentc Member

    Does anyone have any ideas on diy, how to test your exhaust system for leaks. I know there is a smoke test that a mechanic can do. is there anything you can do yourself or purchase? Thanks
  2. spirentc

    spirentc Member


    Just bumping this up in hopes someone new will have some ideas.
  3. ibmoses

    ibmoses Rockstar 100 Posts

    If its just a slight leak it probably gets less noticeable after engine reaches operating temperature...

    What I did with my 70GS455 was jacked it up and put it on stands.
    Then when the engine is cold climb under the vehicle and use your hand to feel around where you think the leak is...

    Just watch for the moving parts or you could get hurt, bad.

  4. tillyb1989

    tillyb1989 New Member

    hi, i'm new here and a way i've found is by covering the end of your tip with a rag. dont hold it on for too long or the back pressure will cause harm. i do this once in awhile to check my 96 silverado for leaks. works well.
  5. Slick1219

    Slick1219 New Member

    Try This

    have a partner hold a rag over the tip....restricting but not stopping exhaust flow. Then get under it with a bug sprayer full of soapy water....of course...only on a cold block/exhaust. -Murph

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