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TRD Exhaust Hissing Sound

Discussion in '3rd Gen. Tacomas (2016+)' started by WoodsGhost, Jul 21, 2021.

  1. Jul 21, 2021 at 12:33 PM
    #1
    WoodsGhost

    WoodsGhost [OP] Well-Known Member

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    This has been going on for almost a year. The cat back TRD exhaust has been on it since purchase 2 years ago.

    I notice a loud hissing sound when climbing a hill or at higher RPMs in general. Especially when driving along a guardrail. Seems to be definitely coming from the exhaust.

    Never noticed it before that.

    Any thoughts?
     
  2. Jul 21, 2021 at 12:36 PM
    #2
    eurowner

    eurowner Duke Sky

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    Do you see any black soot around the two bolt flange?

    The flange bolts may be loose and the gasket has failed.
     
  3. Jul 21, 2021 at 12:39 PM
    #3
    WoodsGhost

    WoodsGhost [OP] Well-Known Member

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    Ill definitely take a look at that. Thanks
     
  4. Jul 21, 2021 at 12:39 PM
    #4
    Mrtacoman88

    Mrtacoman88 TRDude

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    Definitely sounds like an exhaust leak.
     
  5. Jul 21, 2021 at 12:41 PM
    #5
    WoodsGhost

    WoodsGhost [OP] Well-Known Member

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    Exactly what I was thinking. Did a look around underneath but didnt see anything obvious. Maybe just overlooked the gasket
     
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  6. Jul 21, 2021 at 12:51 PM
    #6
    Foster1

    Foster1 Well-Known Member

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    Get a sprayer bottle and put water and soap in it. Then spray all the exhaust connections with the motor on. If you see a big bubble form that means that's where your leak is.
     
    Last edited: Jul 21, 2021
  7. Jul 21, 2021 at 1:00 PM
    #7
    WoodsGhost

    WoodsGhost [OP] Well-Known Member

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    Could this cause a power decrease? I noticed a bit of a power loss after the hissing started, might just be mental idk
     
  8. Jul 21, 2021 at 1:05 PM
    #8
    wrightme43

    wrightme43 Well-Known Member

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    Exhaust leaks normally have a sharp pfffdtt sound, or a brattt bratt sound.
    You might consider checking your airbox and tubing before the mass air flow sensor as well. Intake leaks sound like a hiss or a shhhhhhhhhhhhhsssssss sound.
    Just my two cents based off some words on a page.
     
    WoodsGhost [OP] likes this.
  9. Jul 21, 2021 at 1:21 PM
    #9
    Skydvrr

    Skydvrr IG: @kalopsianick

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    Someone on the TT thread used a leaf blower on their exhaust tip. Just duck taped it on and searched for leaks.
     
  10. Jul 21, 2021 at 1:29 PM
    #10
    US Marine

    US Marine Semper Fi

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    If you hear a definite "Hissing" sound it could be a plugged converter, do you notice any degraded performance ???
     
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  11. Jul 21, 2021 at 4:44 PM
    #11
    WoodsGhost

    WoodsGhost [OP] Well-Known Member

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    That was actually my first thought. What are the odds of a 4 year old converter plugging?
     
  12. Jul 21, 2021 at 4:46 PM
    #12
    RustyGreen

    RustyGreen If you like to drive -- drive what you like !

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    Have someone hold a heavy rag over the tailpipe while you look under the truck with the engine idling in park -- with the hand brake on! :)
     
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  13. Jul 21, 2021 at 4:52 PM
    #13
    WoodsGhost

    WoodsGhost [OP] Well-Known Member

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    I knew I should have posted this earlier. You guys are always a big help :thumbsup:
     
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  14. Jul 21, 2021 at 6:50 PM
    #14
    CT Yankee

    CT Yankee Well-Known Member

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    Only aesthetic mods so far Leer 180 cap & Clazzio covers on order.
    Check the gasket(s) at the exhaust manifold, then work toward the rear.
     
  15. Jul 22, 2021 at 7:26 AM
    #15
    Lphonzy09

    Lphonzy09 Active Member

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    Was the catback TRD exhaust installed as an “aftermarket”? Odds are, a gasket wasn’t used (if it lasted a year, then there is a gasket) or it is bad gasket. You really don’t want to re-use old gaskets and also want to ensure the bolts are torqued properly or they could snap. It could be loose, causing it to not seal properly, thus a leak. If you installed it yourself, now you know. If someone else did it, I would have taken it back (1 year?!) and get the issue resolved.
     
  16. Jul 22, 2021 at 10:28 AM
    #16
    WoodsGhost

    WoodsGhost [OP] Well-Known Member

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    Truck was a lease when I bought it so im assuming factory or presale dealer add on
     

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