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Gas Pedal Whistle Issue

Discussion in '1st Gen. Tacomas' started by UOFan, Jun 21, 2012.

  1. Jun 21, 2012 at 8:12 AM
    #1
    UOFan

    UOFan [OP] Member

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    I just bought a 2001 4x4 Tacoma with 72k Miles on it. I notice that when I slightly press the gas pedal, there is some kind of high-pitched whistle coming from the truck.

    It almost sounds like a dog whistle, and it is relatively soft. It only happens when I press the gas pedal slightly, and when I press harder (or softer) it goes away completely.

    Anyone have this issue in the past? Any info would be greatly appreciated.
     
  2. Jun 21, 2012 at 8:20 AM
    #2
    XwesleysnipesX

    XwesleysnipesX Well-Known Member

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    What kind of air intake system do you have?
     
  3. Jun 21, 2012 at 8:22 AM
    #3
    white toy taco

    white toy taco 505 Member

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    WTF? ive never heard of that. i have no idea what it could be since the pedal is cable drven. the only thing is maybe there is a small hole in one of your air hoses and you can only hear it when the engine is at low rpms
     
  4. Jun 21, 2012 at 9:12 AM
    #4
    UOFan

    UOFan [OP] Member

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    I assume it is the stock air intake, I have only had the truck for 3 days so I haven't gotten around to familiarizing myself with the internals yet (first time Taco owner)

    Also @White Boy Taco

    What is the best way to check for holes? I assume it will be pretty small so I was thinking I could just electrical tape everywhere, then remove it overtime to find the source area (if this is the problem).
     
  5. Jun 21, 2012 at 9:26 AM
    #5
    tacomaman06

    tacomaman06 Carolina Alliance: Lead, follow, or get the hell o Staff Member

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    Make sure you dont have a throttle body spacer installed. All they do is whistle.
     
  6. Jun 21, 2012 at 10:43 AM
    #6
    white toy taco

    white toy taco 505 Member

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    i forgot about that. good point

    well glad to add you to the Taco family! before you do anything, tacomaman06 has a good point. check if you have a throttle body spacer, if you dont know how to spot one, take a pic of your engine and we should be able to tell

    although with a throttle spacer, i dont think if you can run stock intake without modification but im not too sure
     
  7. Jun 21, 2012 at 10:51 AM
    #7
    MowTaco

    MowTaco Well-Known Member

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    The intake is flexible enough that a TB spacer should fit in no problem.

    OP it'll probably be a big chunk of aluminum attached to the manifold of the throttle body. It'll also probably be like red or blue in color (the makers of these are firm believers in the color making it produce more power, and everyone knows bright colors are faster :p ). If you have one it's probably the cause of your whistling. It won't hurt anything to leave it there but if you can't stand the whistling take it off and use it as a paperweight or something.
     
  8. Jun 21, 2012 at 11:47 AM
    #8
    UOFan

    UOFan [OP] Member

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    Thanks you guys, I'm going to go check under the hood now, i'll also take a picture and upload it when i'm done.
     
  9. Jun 21, 2012 at 12:00 PM
    #9
    UOFan

    UOFan [OP] Member

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    Here are the photos, I didn't see anything unusual. I am relatively unfamiliar with the most of a car's engine though, planning to learn on this truck.

    IMG_0081.jpg
    IMG_0082.jpg
     
  10. Jun 21, 2012 at 12:01 PM
    #10
    TACOMABOSS

    TACOMABOSS Well-Known Member

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    I dont see a throtle body spacer. but damn that is one clean engine bay
     
  11. Jun 21, 2012 at 1:03 PM
    #11
    pippen

    pippen that was'nt a vitamin!!

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    Just think of it as turbo/supercharger whine! My old explorer did that alot dunno why and never looked into it. Maybe a vacuum hose leak might be the source, I'm not certain though.
     
  12. Jun 21, 2012 at 1:49 PM
    #12
    MowTaco

    MowTaco Well-Known Member

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    Does it happen in any gear and in neutral? Like if you're coasting fairly fast and just barely hit the pedal does it make the noise? Does it make the noise if you're in neutral or park?
     
  13. Jun 21, 2012 at 1:57 PM
    #13
    UOFan

    UOFan [OP] Member

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    I'll drive around the block and check if it does in neutral. I know it does in gears 1-5
     
  14. Jun 21, 2012 at 2:34 PM
    #14
    UOFan

    UOFan [OP] Member

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    Just finished, it didn't really whistle in neutral, it might have but it was substantially harder to hear. I went from 1500-2500 RPM in N. Maybe something to do with transmission? It only happens when I press the gas pedal VERY slightly.
     
  15. Jun 21, 2012 at 2:37 PM
    #15
    white toy taco

    white toy taco 505 Member

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    this is pretty weird. i guess the only thing to do is to inspect all of the intake hoses
     
  16. Jun 21, 2012 at 3:13 PM
    #16
    UOFan

    UOFan [OP] Member

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    Where exactly are all of the intake hoses located?
     
  17. Jun 21, 2012 at 3:36 PM
    #17
    white toy taco

    white toy taco 505 Member

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    im not sure for the 4cyl. just look at the air box and intake manifold and inspect any hoses that come out of them
     
  18. Jun 21, 2012 at 8:20 PM
    #18
    Ninja

    Ninja The Lone Wolf of TW!

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    Is the sound coming from the front of the truck or the back?
     
  19. Jun 22, 2012 at 8:46 AM
    #19
    UOFan

    UOFan [OP] Member

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    It sounds like it is coming from near the front, but it is hard to tell due to the pitch and volume being so high and low, respectively.
     
  20. Jun 22, 2012 at 2:05 PM
    #20
    MowTaco

    MowTaco Well-Known Member

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    Just read you have a 5 speed... You sure it's not just the slight gear whine associated with a manual trans? I've noticed my truck is much less "refined" than other manual cars I've driven. The stick moves around like crazy and vibrates enough to satisfy the loosest of women. The whines and clicks of it changing gears are also very well pronounced, and I love it :D makes me feel much more "in tune" with the truck.
     
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