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Strange Knock just started, please advise

Discussion in '1st Gen. Tacomas (1995-2004)' started by Tacotit, Feb 12, 2012.

  1. Feb 12, 2012 at 12:07 AM
    #1
    Tacotit

    Tacotit [OP] Member

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    Hey Guys,

    I'm worried about a knock that I just noticed in the last week. It's coming from the driver side, seems to be top of motor but I can't tell for sure. I have had this 96 tacoma 3.4L for about 9 months. The previous owner said he ran synthetic and I run Mobile 1 5w30 with a M1 filter. The oil is super clean. I'm hoping this could be something other than a serious knock but need some advice. I have attached a video. Thanks for the help
    [​IMG]
     

    Attached Files:

  2. Feb 12, 2012 at 9:37 AM
    #2
    uberjason

    uberjason Member

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    with the engine running do you hear it on the bottom end? You'd probably be best to use a stethoscope or long handled screwdriver to try to listen to the noise and determine where it's coming from. (ear on screwdriver technique). Sounds a bit like a bearing of some sort.
     
  3. Feb 12, 2012 at 10:12 AM
    #3
    scotrinaf

    scotrinaf Well-Known Member

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    Sounds almost like a loose lifter... I'd recommend having it checked as soon as possible...
     
  4. Feb 12, 2012 at 10:38 AM
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    52motorhead

    52motorhead Well-Known Member

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    Kinda sounds like a spun rod bearing. Like scotrinaf said have it checked asap.
     
  5. Feb 13, 2012 at 6:25 AM
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    goomba

    goomba It is a Fluid Situation

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    Doesn't seem to be a spun rod bearing. My bro spun a rod bearing in his truck, and it knocked HARD and engin would not run. I only know what a spun bearing sounds like, but I would deff have it checked though.
     
  6. Feb 13, 2012 at 10:15 AM
    #6
    shampoop

    shampoop Well-Known Member

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    Definitely sounds like it could be something VERY BAD to me.
     
  7. Feb 13, 2012 at 12:04 PM
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    4WD

    4WD cRaZy oLdmAn

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    Dude .... thats a rod knock

    wasn;t sure till you revved it up, sure sounds like one to me anyway
     
  8. Feb 13, 2012 at 8:54 PM
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    Tacotit

    Tacotit [OP] Member

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    Thanks for the replies guys. I figured out what it was today. I took uberjason's advice and used a screwdriver to try and narrow it down. (thanks for the tip dude, hadn't heard that before). Anyway, as i used the screwdriver I couldn't hear the knock internally so I started looking and listening and narrowed it down to the driver side valve cover. Turns out the #2 plug had turned (Loosened) almost all the way out and pushed the wire boot off it's seat. The noise was actually the compression coming out the spark plug hole. I tightened the plug back up and seated the boot and noise is gone. Thank goodness, I was a little nervous on this one. The reason I bought a Tacoma to avoid major problems. I've never had a plug do that on a vehicle so it was kinda strange. I'll keep my eye on it and make sure it doesn't loosen back up.
     
  9. Feb 13, 2012 at 8:57 PM
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    wildjerseyfirefighter

    wildjerseyfirefighter I sell fishing and fishing accessories

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    i had that happen on my old 96 once after doing plugs,oddly on the drivers side as well.
     
  10. Feb 13, 2012 at 9:19 PM
    #10
    Tacotit

    Tacotit [OP] Member

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    Weird, I think it has happened to me on motorcycles but never on one of my trucks.
     
  11. Feb 13, 2012 at 9:21 PM
    #11
    wildjerseyfirefighter

    wildjerseyfirefighter I sell fishing and fishing accessories

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    Where are you at? Wonder if its my old 96? LoL
     
  12. Feb 13, 2012 at 9:59 PM
    #12
    4WD

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    Well gotta say it sure doesn't sound like escaping compression to me & if the plug was loose & the plug wire was loose /off the plug, wheres the cylinder miss ? That motor should've been shaking & shuddering with even 1 misfire, but if you say thats what it is, so be it
     
  13. Feb 14, 2012 at 2:34 AM
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    shampoop

    shampoop Well-Known Member

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    That's great news. I was kinda worried it would be a rod knock too. I've never heard anything quite like that so I wasn't sure what it is. It sounded kinda like a rod knock to me except the sound is much more hollow, not quite as low, and no double taps.
     
  14. Feb 14, 2012 at 2:51 AM
    #14
    XBrown

    XBrown Spartacus!

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    Similar thing just happened to my 2000 4Runner. One night it was making a ticking noise (like a valvetrain noise), and the next day it shot the #3 spark plug out of the head, and took all the threads with it. The machine shop was able to heli-coil the spark plug hole, but you're lucky you caught that when you did.
     
  15. Feb 14, 2012 at 10:31 AM
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    Tacotit

    Tacotit [OP] Member

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    Dude that's why I was so surprised. There was no misfire at all. The motor was running when I narrowed it to that plug cap. I pushed down on the cap and seated it back on the valve cover while it was running. As soon as I did that it sealed up and the noise was gone. It was probably only like an 1/8" off it's seat. I'm not positive, but the plug was probably about 3/4 the way out. Could have been less i guess but it was enough that air was getting by it. I'm just glad I caught it before it went any further and blew the plug, and threads, all the way out.
     
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