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Knocking sound coming from somewhere at about 1000 rpm.

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Lthompson, Nov 4, 2019.

  1. Nov 4, 2019 at 2:18 PM
    #1
    Lthompson

    Lthompson [OP] Well-Known Member

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    This has been going on for a few months and seems to be getting worse. Has anyone ever had knocking sounds coming from a catalytic converter? Seems like that is where it’s coming from but I don’t know.
     
  2. Nov 4, 2019 at 2:20 PM
    #2
    crackils

    crackils Sith Lord Jar Jar

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    By chance do you notice it more when it's cold out? I have a very similar issue I'm having a hard time diagnosing, though I notice it the most when it is 60° F or cooler.
     
  3. Nov 4, 2019 at 2:21 PM
    #3
    BassAckwards

    BassAckwards Well-Known Member

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    Which catalytic converters? the ones in the headers near the motor, or the secondary set in the ypipe? Seriously hope its just a cat that's bad and rattling and not something else. Any drivability issues or Check engine lights?
     
    whatstcp likes this.
  4. Nov 4, 2019 at 2:35 PM
    #4
    Lthompson

    Lthompson [OP] Well-Known Member

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    Secondary/rear . No engine lights. I’m trying to upload a video but it’s refusing to work
     
  5. Nov 4, 2019 at 2:37 PM
    #5
    NYCTaco52

    NYCTaco52 Half man, half goat

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    Sound is coming from the transmission. Most likely the flywheel. It's been documented around here about them cracking and causing a uneven 'tick'. One way to check is put a scope in there and look for cracks
     
    Lthompson[OP] likes this.
  6. Nov 4, 2019 at 2:49 PM
    #6
    Lthompson

    Lthompson [OP] Well-Known Member

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  7. Nov 4, 2019 at 5:30 PM
    #7
    12taco12

    12taco12 Well-Known Member

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    what's the truck info
     
  8. Nov 4, 2019 at 6:55 PM
    #8
    Lthompson

    Lthompson [OP] Well-Known Member

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  9. Nov 4, 2019 at 9:25 PM
    #9
    JC15Taco

    JC15Taco Well-Known Member

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    Can't say for sure based on the vid...but it certainly varies with rpm, so it's definitely a rotating part that is making the noise.
     
  10. Nov 6, 2019 at 4:41 PM
    #10
    Lthompson

    Lthompson [OP] Well-Known Member

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    Makes sense,, But, When you get under the truck, you hear it right at the Cat.. Like the engine pulses causing it.. I have seen some youtube videos of this.. But, like you said, its sounds like a rotating part issue.. But when I cant actually identify it as coming from the motor anywhere, it confuses me.
     
  11. Nov 7, 2019 at 2:02 AM
    #11
    12taco12

    12taco12 Well-Known Member

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    take it to a shop if you cant determine the source
     
  12. Nov 7, 2019 at 2:42 AM
    #12
    SliMbo4.0

    SliMbo4.0 Well-Known Member

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    just curious, is the sound is any different right after start up versus after everything is up to temp from driving around?
     
  13. Nov 7, 2019 at 10:38 AM
    #13
    obscurotron

    obscurotron Well-Known Member

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    Too many to list, and I've probably forgotten a bunch.
    My '14/V6/MT6 does the same thing, has been doing it for the last 36k miles.

    It got really loud last year during deer season, so when it got too hot to hunt mid-day, I took the DS cat cover off and found a small rock wedged between the cover and the cat.

    That made it less noisy, but the noise is still there. From listening with a screwriver pressed to the cat, downpipe, bell housing, block, and a few other spots, it sounds loudest from the bell housing/lower block (just above the oil pan).

    UOA's from Blackstone are fine, so I suspect it's something in the flywheel/TO/pilot/transmission area (bell housing probably acts to amplify the noise). Annoying AF, but doesn't seem to indicate an internal engine issue if the UOA's are a reliable metric for that.

    Oh, yeah, and I plugged a fat forked horn later that evening, so double-bonus! ;)
     
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  14. Nov 7, 2019 at 11:00 AM
    #14
    TACOGUY23

    TACOGUY23 Well-Known Member

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    mines same way... many from this site have same sound...very "normal" and goes away after a few minutes of warming up.i thought it was piston slap but many from here have reassured me its normal.
     
  15. Nov 7, 2019 at 11:02 AM
    #15
    TACOGUY23

    TACOGUY23 Well-Known Member

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    google.... 2013 tacoma loud motor cold tacomaworld....
     
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  16. Nov 8, 2019 at 10:57 AM
    #16
    FrostbitTaco

    FrostbitTaco Well-Known Member

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    My 2015 sounds the same in the mornings during the cold starts. Once its warms up sounds dies down. There have been many posts on hear about the issues. Many have different appoints but majority I have read says "Normal". A few have even taken them in and all the mechanics say normal.
     
  17. Nov 8, 2019 at 12:30 PM
    #17
    boogie3478

    boogie3478 Well-Known Member

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    Check to make sure all of your heat shields are tight.
     
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  18. Nov 8, 2019 at 2:46 PM
    #18
    JoshS

    JoshS Well-Known Member

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    crackils[QUOTED] likes this.
  19. Nov 8, 2019 at 5:22 PM
    #19
    Lthompson

    Lthompson [OP] Well-Known Member

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    doesn't change once warm.. hard to notice on cold startup because of the engine idling higher.. Not affected by weather. Tried the screwdriver to the ear thing several times.. I can never hear anything on the motor or bellhousing indicating its from there.. But, its also quite hard to rev the motor while im underneath it.. lol
     
  20. Dec 13, 2019 at 4:52 PM
    #20
    ttc

    ttc Well-Known Member

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    You figure it out? Mine is similar.
     

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