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High Pitch whistle/whine when cold

Discussion in '1st Gen. Tacomas' started by Tashier, Jun 22, 2012.

  1. Jun 22, 2012 at 3:59 PM
    #1
    Tashier

    Tashier [OP] Well-Known Member

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    Sean
    Beaverton, OR
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    99 Tacoma V6 Limited
    Air Bar Suspension
    Well,

    I've had this problem almost since the truck was new and heck I thought I would throw it up here. It hasn't posed any issue that I know of other than being annoying.

    Basically when the truck is cold it will whistle from the engine. The pitch goes higher and lower with RPM. I thought maybe it was something in the timing belt but even after I changed the timing belt and waterpump it still did it. I'm pretty sure this is an air noise and not a belt noise as changing the belts made absolutely no difference. Almost like the intake manifold is sucking air when it's cold or something.
     
  2. Jun 22, 2012 at 6:40 PM
    #2
    Supra TT

    Supra TT Solid Axle FTMFW!!

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    Eric
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    SAS.. Need I say more.
    Did you check your vacuum lines? Kinda sounds like one popped off.
     
  3. Jun 22, 2012 at 11:21 PM
    #3
    Tashier

    Tashier [OP] Well-Known Member

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    Air Bar Suspension
    Ya, I've looked all over around in there. I never found anything obvious. Such a weird deal, I should record it if I could. I swear it's gotta be the intake manifold. Then when it warms up it seals off and goes away. But, it's ran fine for the last 70,000 miles like that.
     
  4. Jun 22, 2012 at 11:37 PM
    #4
    UOFan

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  5. Jun 23, 2012 at 9:40 AM
    #5
    Tashier

    Tashier [OP] Well-Known Member

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    Sean
    Beaverton, OR
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    99 Tacoma V6 Limited
    Air Bar Suspension
  6. Nov 5, 2012 at 4:29 PM
    #6
    Tashier

    Tashier [OP] Well-Known Member

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    Beaverton, OR
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    99 Tacoma V6 Limited
    Air Bar Suspension
    Man, I think I have someone's 4 runner, same v6 3400 engine, same problem. Definitely not a belt noise as I intentionally replaced ALL belts, tensioners, waterpump etc. when I did the timing belt. Same exact noise after.
     
  7. Nov 5, 2012 at 4:31 PM
    #7
    Tashier

    Tashier [OP] Well-Known Member

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    Sean
    Beaverton, OR
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    99 Tacoma V6 Limited
    Air Bar Suspension
    I guess another way to describe this noise would be like filling up a balloon and letting a little bit of air slowly leak out making a high pitch squeal. Only when it's cold. When warm, gone. Summertime, no noise ever. Been like this for over 10 years.
     
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