Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150
Sign in using an external account
Register Forgot Password?


1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage SPONSORED BY:




 
Reply
 
LinkBack Thread Tools Search this Thread
  #1 (permalink)  
Old 07-22-2010, 08:29 PM
Jayme Duty Jayme Duty is offline
Elder User
1994 Ford F-250
My Garage
 
Join Date: Nov 2009
Posts: 793
Jayme Duty is starting off with a positive reputation.
loud humming coming from air intake

first of my truck is an 03, xlt 4.6 5-speed with 82,000 miles. Almost always when i come to a stop i can hear a faint humming that is coming from the engine compartment. There is no pattern or set way that this humming happens, it just comes and goes as it please when at idle. As soon as you put load on the motor it will go away. I got under the hood today and fired it up, nothing, gave it just a little throttle and sure enough here is this odd humming. It is coming from in the air intake. Any body have any ideas. Also while i was under there i noticed that the cable that is right next to the throttle cable is very loose, i am not sure what this cable goes to or if this could be part of my problem
Reply With Quote
  #2 (permalink)  
Old 07-22-2010, 08:57 PM
steve(ill)'s Avatar
steve(ill) steve(ill) is offline
Post Fiend
Garage is empty, add now
 
Join Date: Jul 2005
Posts: 5,948
steve(ill) has a good reputation on FTE.steve(ill) has a good reputation on FTE.steve(ill) has a good reputation on FTE.
the stock filter and air horn normally mufflle the noise... have you got an aftermarket filter, air horn or throttle plate installed--- they make the noise.
__________________
2002 SuperCrew 4 x 4 5.4 XLT -110K miles -NEW
2010 EDGE FWD - V6 ----------34,000 miles
2002 Explorer 4 x 4 4.0 XLT --- 162,000 miles
2001 SuperCrew 4 x 4 5.4 XLT -235K miles -GONE
Reply With Quote
  #3 (permalink)  
Old 07-23-2010, 09:13 AM
Jayme Duty Jayme Duty is offline
Elder User
1994 Ford F-250
My Garage
 
Join Date: Nov 2009
Posts: 793
Jayme Duty is starting off with a positive reputation.
it is an aftermarket k&n cone filter but that has been on there forever and the noise is new. Also when you take the filter out the noise gets much louder.
Reply With Quote
  #4 (permalink)  
Old 07-23-2010, 11:03 AM
Johnny Langton's Avatar
Johnny Langton Johnny Langton is offline
Postmaster
2005 Ford F-250
 
Join Date: Oct 2006
Location: SE Texas
Posts: 4,171
Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.
Does it kinda sound like an owl hooting or goose honking?
If it sounds like either one of those-change the IAC valve.
JL
__________________
2005 F250 Crewcab 3V V10/Torqshift/4.10LS
2001 F150 Supercab 4.6L/4R70W/3.55
1997 Thunderbird LX 4.6L/4R70W 12.16@111.78
2010 Lincoln MKT Elite-3.5L EcoBoost/AWD 14.41@96.27
Reply With Quote
  #5 (permalink)  
Old 07-23-2010, 05:58 PM
Jayme Duty Jayme Duty is offline
Elder User
1994 Ford F-250
My Garage
 
Join Date: Nov 2009
Posts: 793
Jayme Duty is starting off with a positive reputation.
and since i am not very motor literate what is the IAC valve and where does it go and how much should one cost
Reply With Quote
  #6 (permalink)  
Old 07-23-2010, 10:52 PM
Johnny Langton's Avatar
Johnny Langton Johnny Langton is offline
Postmaster
2005 Ford F-250
 
Join Date: Oct 2006
Location: SE Texas
Posts: 4,171
Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.Johnny Langton has a great reputation on FTE.
Quote:
Originally Posted by Jayme Duty View Post
and since i am not very motor literate what is the IAC valve and where does it go and how much should one cost
Idle Air Control solenoid. It's on the upper part of the intake manifold,and replacements usually run around $35.
JL
__________________
2005 F250 Crewcab 3V V10/Torqshift/4.10LS
2001 F150 Supercab 4.6L/4R70W/3.55
1997 Thunderbird LX 4.6L/4R70W 12.16@111.78
2010 Lincoln MKT Elite-3.5L EcoBoost/AWD 14.41@96.27
Reply With Quote
  #7 (permalink)  
Old 08-06-2010, 09:43 PM
Spaceman Spiff Spaceman Spiff is offline
Junior User
Garage is empty, add now
 
Join Date: Aug 2006
Posts: 68
Spaceman Spiff is starting off with a positive reputation.
Maybe this thread will help:

http://www.ford-trucks.com/forums/94...4-buzzing.html
Reply With Quote
  #8 (permalink)  
Old 08-07-2010, 01:45 AM
Podaso Podaso is offline
Senior User
Garage is empty, add now
 
Join Date: Jan 2010
Posts: 210
Podaso is starting off with a positive reputation.
Quote:
Originally Posted by Jayme Duty View Post
Also while i was under there i noticed that the cable that is right next to the throttle cable is very loose, i am not sure what this cable goes to
Sounds like your mystery cable is for the cruise control. Someone correct me if I'm wrong.
Reply With Quote
  #9 (permalink)  
Old 08-08-2010, 09:35 AM
Dave G. Dave G. is offline
Elder User
Garage is empty, add now
 
Join Date: Mar 2010
Posts: 599
Dave G. is gaining momentum as a positive member of FTE.
Jayme

In the last 6 years, I've put 5 IAC valves on my 4.6, just to keep it starting up. Curiously, the most recent IAC had an assist spring located behind the piston. None of the previous valves had this.

Now, with the new valve, I get the loud humming that I think you have. I know it's the IAC, because after starting the truck, I can unplug the little 2 wire harness to the valve, and the humming stops immediately.

And, by the way, the last few valves I've picked up were $85.00 ea.

Dave
Reply With Quote
  #10 (permalink)  
Old 08-08-2010, 03:56 PM
Podaso Podaso is offline
Senior User
Garage is empty, add now
 
Join Date: Jan 2010
Posts: 210
Podaso is starting off with a positive reputation.
My original IACV had the spring you're speaking of. The new one I installed from Napa Auto Parts doesn't have a spring. No humming sound from either one of them.
Reply With Quote
  #11 (permalink)  
Old 08-08-2010, 10:59 PM
eallanboggs eallanboggs is offline
Elder User
Garage is empty, add now
 
Join Date: Jan 2008
Posts: 605
eallanboggs is starting off with a positive reputation.
Bird nest or cat in plenum..
Reply With Quote
  #12 (permalink)  
Old 08-08-2010, 11:04 PM
DLP Performance DLP Performance is offline
Senior User
1972 Ford F-100
 
Join Date: Oct 2009
Posts: 288
DLP Performance is starting off with a positive reputation.
Yes, IAC, Idle air control valve. I like the Motorcraft brand. Costs about the same as the Taiwan stuff in the aftermarket.
Reply With Quote
  #13 (permalink)  
Old 09-22-2010, 12:48 AM
pdyeager pdyeager is offline
New User
Garage is empty, add now
 
Join Date: Sep 2010
Posts: 3
pdyeager is starting off with a positive reputation.
my f250 intake humming goes away if i remove the hose that goes to the valve cover from the intake. it creates a vacuum slowly and sucks air out of the intake into the valve cover. will the iac valve fix this or might i have bigger issues internally? the hose i am talking about is on the top of the drivers side valve cover and is attached to the lower nipple on the air intake toward the throttle body end of the assembly.
Reply With Quote
  #14 (permalink)  
Old 09-22-2010, 03:56 AM
Dave G. Dave G. is offline
Elder User
Garage is empty, add now
 
Join Date: Mar 2010
Posts: 599
Dave G. is gaining momentum as a positive member of FTE.
How snug did that hose fit the rubber boot on the intake duct work ? Maybe it's loose enough to have a air leak which may cause the noise. Possibly a small hose clamp can work, if you can get one on there.

Mine is pretty well gone. I did change back to the OEM filter instead of a K & N.

Dave
Reply With Quote
  #15 (permalink)  
Old 09-22-2010, 05:43 AM
pdyeager pdyeager is offline
New User
Garage is empty, add now
 
Join Date: Sep 2010
Posts: 3
pdyeager is starting off with a positive reputation.
the hose fits very snug and is still very pliable. it is the stock intake with no modifications. i just don't understand why it creates a vacuum into the valve cover.
Reply With Quote
Old 09-22-2010, 05:43 AM
Reply

Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150

Tags
40, coming, diesel, engine, explorer, f150, f250, ford, hum, hummimg, humming, intake, lightning, loud, sound

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 09:08 PM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.5.2 ©2010, Crawlability, Inc.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.



 
vbulletin Admin Backup