Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
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  1. 04-24-2011, 07:55 AM #1
    brian75x
    brian75x is offline Associate
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    Question Whistle at low throttle?

    I have an odd "whistle" noise at low throttle. It is not present at idle (zero throttle) or at any throttle over, say 15%. It only occurs when driving leisurely with light throttle pressure (like up a very slight grade at 25mph).

    It is high-pitched. The pitch does not vary with RPM's. It just starts with a little throttle pressure and goes away if you let off pressure or give a little more pressure.

    I do not think it is a squeak or squeal, it is more of a whistle as if produced by air, not metal or rubber.
    NO check engine light.
    It sounds like it is from engine compartment, not chassis.

    Ideas?
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  2. 04-24-2011, 08:02 AM #2
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    kayger12
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    My money is on a torn lower intake boot.

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  3. 04-24-2011, 08:05 AM #3
    Matt
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    Have a look at your lower intake boot, as seen in Topic #9 HERE and the DIY to fix it HERE
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  4. 04-24-2011, 08:33 AM #4
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    adb1028
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    Definitely your lower intake boot. I had the same problem a few months ago and that solved the problem. Mine was all dried up and had a few nice sized cracks in it. Its a somewhat easy DIY, but its a real pain getting the metal clamps off since the screws are facing backwards. I would replace your upper boot too (which I wish I did at the time).

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  5. 04-24-2011, 12:57 PM #5
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    zhpnsnv
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    Dealer just quoted my friend $415 for a lower intake boot. It's something like a $20 part. Hahahaa


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  6. 04-24-2011, 01:11 PM #6
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    kayger12
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    Quote Originally Posted by zhpnsnv View Post
    Dealer just quoted my friend $415 for a lower intake boot. It's something like a $20 part. Hahahaa


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  7. 04-24-2011, 02:33 PM #7
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    danewilson77
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    What about the lower intake boot? Hehe

    Also...gasket around the disa, or upper intake boot could be culprits....

    Also...check codes anyways....as they can be stored and not represented by a light......if you have a reader...

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  8. 04-24-2011, 02:37 PM #8
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    Quote Originally Posted by brian75x View Post
    I have an odd "whistle" noise at low throttle...

    Ideas?
    How many miles on your car?
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  9. 04-24-2011, 03:31 PM #9
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    Crickett
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    +1 more on the lower intake boot; I had mine go a few years ago.


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  10. 04-24-2011, 04:01 PM #10
    brian75x
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    Quote Originally Posted by aurelius View Post
    How many miles on your car?
    Just over 58,000 miles on it.
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