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Buzzing type sound coming from under hood.

Discussion in '1st Gen. Tacomas' started by Hoodoo Creek, Jun 28, 2013.

  1. Jun 28, 2013 at 9:58 PM
    #1
    Hoodoo Creek

    Hoodoo Creek [OP] Member

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    So after I drove my truck home after purchasing it, and turning the key off, I notice that there was an intermittent buzzing sound coming from a box looking thing over the drivers front fender. Surprisingly, after the truck has been sitting for several days now, I went out and it's still making the buzzing sound. Sounds like a bumble bee buzzing for just a second, then pauses for about 30 seconds then buzzes again. What could this be? :)
     
  2. Jun 29, 2013 at 8:03 AM
    #2
    tan4x4

    tan4x4 Well-Known Member

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    A photo of the 'thing' would help
     
  3. Jun 29, 2013 at 8:27 AM
    #3
    Dirty Pool

    Dirty Pool Lost In The Ozone

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    Normal (usually), it is the "charcoal canister", a system to control evaporative emissions from the fuel tank. The noise is just a check valve fluttering as pressure changes in the tank.
     
  4. Jun 29, 2013 at 10:28 AM
    #4
    Hoodoo Creek

    Hoodoo Creek [OP] Member

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    I pulled this photo off the web, but I circled the box I'm talking about.........

    fuffu.jpg
     
  5. Jun 29, 2013 at 10:56 AM
    #5
    Dirty Pool

    Dirty Pool Lost In The Ozone

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    59.4 Miles, 56.67*NE Of Moab
    Vehicle:
    99 XCAB V6 MT TRD
    Dirty Pool rear bumper/air tank with integrated spare CV shaft storage, DP customized TJM front bumper, 8000 lb Ramsey/Technora rope, E-locked, Extended breathers with front diff catch can, SAWs with DP heim joint seals, DP custom 6 leaf rear springs/Billies, DP custom skids, 2lo, Gray wire, Cap, Bed Rug, Black steelies, Both 31" MTZ's and 33" Toyo's, 01 Center console, Map lights, Disraeli gears
    Yep, that's the beast.
     
  6. Jun 29, 2013 at 1:12 PM
    #6
    Dirty Pool

    Dirty Pool Lost In The Ozone

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    59.4 Miles, 56.67*NE Of Moab
    Vehicle:
    99 XCAB V6 MT TRD
    Dirty Pool rear bumper/air tank with integrated spare CV shaft storage, DP customized TJM front bumper, 8000 lb Ramsey/Technora rope, E-locked, Extended breathers with front diff catch can, SAWs with DP heim joint seals, DP custom 6 leaf rear springs/Billies, DP custom skids, 2lo, Gray wire, Cap, Bed Rug, Black steelies, Both 31" MTZ's and 33" Toyo's, 01 Center console, Map lights, Disraeli gears
    After some thought I recall a TSB about this. Turns out there was.
    The noise is totally harmless but Toyota came up with a fix. Unfortunately the part is no longer available. It was nothing more than a 50cc box spliced into one of the canister lines. You will have to get creative and mimic the part. It is just a little chamber to "smooth" the vapor flow.
    Here is the TSB and a write up on it's install. If you go this route, install it as close as possible to the canister, like in the TSB below. Newer models have the "box" glued right onto the round part of the canister.
    https://sites.google.com/site/bugeyebug/4runner-evapbuzz

    I used the shell of a cartridge type fuel filter (with out the cartridge) as a "catch can" on the vent line from my front diff. That's another story but something similar, maybe a tad larger, could be spliced into the canister line as a buzz kill.:rolleyes:

    [​IMG]
     
    Last edited: Jun 29, 2013
  7. Jun 29, 2013 at 10:25 PM
    #7
    Hoodoo Creek

    Hoodoo Creek [OP] Member

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    Hey, thanks Dirty Pool. I'm relieved! I kinda like that bumble bee sound so I think I'm going to just leave it as is.:D I've got more questions and I gotta tell you that I'm really enjoying this forum almost as much as my truck!;)
     
  8. Jun 29, 2013 at 10:52 PM
    #8
    IDtrucks

    IDtrucks Just out for a rip are ya bud?

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    yup. a ton of people, have it (i do) and once i realized it was just another noise the truck makes, i stopped caring.
     
  9. Jun 30, 2013 at 7:59 AM
    #9
    tan4x4

    tan4x4 Well-Known Member

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    My '99 has that new feature built-in. My guess is, they made the fix beginning in 1998 models

    [​IMG]
     
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