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High pitched humming sound.

Discussion in 'Under the Hood' started by psychotic, June 28, 2002.

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    1. psychotic

      psychotic Active Member

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      Have you ever had one of those tubes (or heard one) thats a toy, and you swing it around real fast and the wind causes a high pitched humming noise?
      Well, my ex decides to sometimes, not always, but a lot of the time, hum like this at idle. It can be very loud and annoying. It started right after I put in my K&N FIPK, so i thought maybe that might have something to do with it, but I don't know what. Also my dad thinks it may be a fuel pump going bad, or the alternator straining to recharge the battery because of my system? Any help or ideas?
       
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    3. Luv2explorer

      Luv2explorer Active Member

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      You need to try and place where the noise is coming from. I have the same sound, and I believe that it is my fuel pump.
       
    4. Lifted95X

      Lifted95X The Xplorer U Luv to H8 Elite Explorer

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      It is probably the IAC. Do a search.
       
    5. RedBeard

      RedBeard Active Member

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      If you give it gas and it goes away, its the IAC. Mine was so loud I could hear it out of my tailpipe.

      -RB
       
    6. Texplorer

      Texplorer Elite Explorer

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      Good thing I saw this post, mine has the same noise and it does go away when I give it gas. The sound only starts after the X has warmed up a while.
       
    7. mercury

      mercury New Member

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      Mine does the same thing.....What is the IAC?
       
    8. Lifted95X

      Lifted95X The Xplorer U Luv to H8 Elite Explorer

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      Idle air control.
       
    9. RedBeard

      RedBeard Active Member

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      Here ya go!

      [​IMG]

      -RB
       
      Last edited: July 2, 2002
    10. TPLYNCH

      TPLYNCH Well-Known Member

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      Mine does the same thing when idling while warm. I traced it to my air intake (stock). If I open it up while it's running, the hum is deafening! So I figure it's an intake problem, unless the IAC causes a hum that resonates back down intake tube.
       
    11. bigA

      bigA New Member

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      If the sound is coming from the air intake box, it's the IAC. Usually more common when it's warm out.
       
    12. Texplorer

      Texplorer Elite Explorer

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      Alright, I opened up my hood after the humming started to see where it was coming from and sure enough it was from my air intake. Does it matter that I have a KKM or is it still the IAC.
       
    13. Digger196

      Digger196 Well-Known Member

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      dude i got the same! so what we concuding it to be? the IAC ?
       
    14. RedBeard

      RedBeard Active Member

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      When I first had the "moose call", I thought for sure it was my brand new K&N FIPK (which was installed 3 days before the IAC took a dump).

      I was certain that my FIPK was the problem because the sound was coming from the filter... I removed my IAC, cleaned it, and it worked fine for a day, then the noise returned. I replaced the IAC and the noise was gone for good.

      -RB
       
    15. Texplorer

      Texplorer Elite Explorer

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      Is the replacement IAC just a simple unbolt the old one and bolt up the new one process?
       
    16. Robert

      Robert Well-Known Member

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      When you get the "humming" do you get it at all speeds or only when idleing? Mine has definately picked up a hum since I cleaned my engine a couple of months ago. It hums while idleing and any time I put the gas pedal more than 1/4 of the way down. I thought it was from my FIPK since one of the mounting holes has been broken for some time. I figured it was leaking air so I put my stock air-box back on but the humming is still there. It is a bit quieter though, but still noticeable.

      I thought that since the IAC only controls the idle, that it would only make the noise at idle. If it can cause the "humming" while driving also, then at least I can be reasonably certain that is where the noise is coming from and I won't worry about it anymore. I was beginning to think that I had a bearing going out somewhere. It only showed up after I sprayed engine cleaner all over my engine and hosed it off.
       
    17. Lifted95X

      Lifted95X The Xplorer U Luv to H8 Elite Explorer

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      Mine hums while applying gas too...but after a decient amount, it cuts off. It's the IAC.
       
    18. Texplorer

      Texplorer Elite Explorer

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      Good timing, I just stepped in the door. I was just at auto zone asking about the IAC and the guy there told me that I dont have one.:confused: He told me to check for carbon build up inside the intake tube.
       
    19. RedBeard

      RedBeard Active Member

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      Autozone... Gotta love em. Other than their free tool rental, they pretty much blow.
       
    20. Robert

      Robert Well-Known Member

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      Texplorer - you would have stood just as good of chance at getting a correct answer by going to Tot's Unilimited and talking to one of the students. You most definately do have an IAC valve.
       
    21. DasFrem

      DasFrem Elite Poseur Elite Explorer

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      Hey RedBeard, how long have you had the new IAC, I looked at NAPA and they sell 'em for $120 is this about what you paid? I tried the whole cleaning it out (with EFI cleaning spray) and put it back it and that didn't help. Then I just tried unpluggng the IAC which dropped my idle to about 500 instead of 1100-900. When you unplug it, the noise goes away, but it's idleing real low. Arg, it's been like this in the hot months for the two years I've had my KKM Filter on. And from what I can see, the only people who get this problem are those of us who go with a KKM or K&N FIPK. Any other suggestions out there?
       
    22. Texplorer

      Texplorer Elite Explorer

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      Robert- Yeah I know, I even took the guy out to the X popped the hood and pointed at it and he said that it was the throttle body . He then said that my DPFE was a solenoid. So I smiled and walked away.
       
    23. DasFrem

      DasFrem Elite Poseur Elite Explorer

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      Ok guys, you might all like this, so I was looking at this thread:
      http://www.explorerforum.com/forums/showthread.php?s=&threadid=50861
      and jwrezz said that when he removed that black knob thinggy (my new tech term for it) he said the hum went away. So I ran out and tried and and Viola! no hum! and the idle is fine. what it is, is a breather cap and there's a little filter in it to let in air. What I suppose is going on with most of us is that when we put on our FIPKs, the motor can breath easier right? Well then the IAC needs to breath better (I could be wrong, but it makes sense to me). So what I'm doing is drill a few small holes on the inside of the cap to let it breath easier. You have to pull yours off in order for this to make sense, it's kinda hard to describe what it lookes like on the inside. so heres a pic of what I'm talking about and when I'm done, I'll tell ya'll if it works or not.
      [​IMG]
       
    24. Robert

      Robert Well-Known Member

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      My hum doesn't have anything to do with my FIPK since my FIPK had been on for two years prior to the hum. My hum started when I hosed off my motor.
       
    25. DasFrem

      DasFrem Elite Poseur Elite Explorer

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      Well then, the water could have clogged the breather cap.

      So I took that breather cap, drilled all kinds of holes in it and the hum got much quieter. Then I went too far and cut some of the bottom of the breather cap off to make it shorter (I don't really know why, I thought it might help) and kind of ended up destroying the cap. So anyway, I just have it totally removed for now unitl I can think up of another solution. On the bright side, it makes abosoulty no hum.
       
    26. Jason_25

      Jason_25 Elite Explorer<br>ECX Member Elite Explorer

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      Dasfrem, did it make the idle any better? Or was yours idling fine while it was humming?
       

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