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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 07-16-2006
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Humming noise from air box?

Has anyone experienced a humming sound coming out of the air box? Its sporatic and both my 00 Ranger 4.0 OHV and my dads 99 4.0L OHV are doing it. Any ideas?
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Old 07-16-2006
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IAC Valve
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Old 07-17-2006
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Yup. IAC. It'll only get louder/more frequent. It's about a 5-10 minute task to replace and I think I paid around $60 or something for it at a Discount Auto. I have 0.00002 mechanical ability and I did it. Some people quiet the noise by cleaning it but I wanted a permanant fix.
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Old 07-17-2006
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Mine did it once when evacuating for a hurricane after sitting in traffic for 7hrs or so.That leaves me to think it is heat related.It hasn't done it since and I have 170,000 miles on it.If it ever does it again I will replace the IAC.I do remember it being very loud and annoying but if I gave it a little throttle it went away.
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Old 07-17-2006
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Where is the IAC?
Pics would do nice!
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Old 07-17-2006
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On top of your intake manafold....silver....i imagine someone got some pix
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Old 07-17-2006
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is it kind of a speradic high pitched whistle? cuz if it is i got that.
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Old 07-17-2006
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^ that would be your mac, because mine does the same thing.....about 2300 to 3k it whistles, i think its the cone filter...
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Old 07-17-2006
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mine has same problem...ill fix it when i go home on leave and pick up my truck...i got a lot of plans while im stationed at Fort Sill, Oklahoma
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Old 07-17-2006
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Mine does the same thing only does it after the truck sits and idles, like in the drive thru, or waiting in line at the boat launch. when i give a little thorttle it goes a away for a bit then starts back up, but like i said it only does it when i sit still for an extended period.. Very annoying..

so is it the IAC or the MAF?
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Old 07-18-2006
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If you give it throttle you are no longer idling, thus the IAC (Idle Air Control) valve is not a problem. If at idle, you have a howl it sounds like the IAC. If you want to clean the MAF and see if it helps get a can of stuff, I think it's called CNC Electronics cleaner or something like that, check the how-to section for the cleaning how to and clean it up.

EDIT: Couldn't find a how-to here so check out this one
http://www.therangerstation.com/tech.../CleanMAF.html

Last edited by Shalafi49; 07-18-2006 at 08:14 AM.
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