05 expedition whistle
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Joined: Feb 2003
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From: Portage, MI
05 expedition whistle
I have a 2005 Expedition xlt 4x4 with 3V 5.4. When outside temp drops (as it does this time of year) I get a high pitched whistle from the engine while driving down the road maintaining speed. If I get off the gas pedal or stomp it the whistle goes away then comes back a few seconds later. I have to do this several times to get it to stop whistling. Any ideas?
Logistics Pro
Joined: Jan 2001
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From: Central NYS
I had this happen a couple of times last winter on my '02 Navi.
Usually stops immediately upon getting off the gas pedal, but one time it started doing it while it was idleing and I was still in the driveway. I jumped out and quickly opened the hood - the "whistle" was definetly coming from under the hood. I rested my hand on the air intake tube and it was doing this high frequency vibration thing that seemed to be in sync with the "whistle/noise". Just as I figured it might be in the air intake tube (between the air filter and the throttle body), it stopped making the noise and the vibration stopped.
I don't t-h-i-n-k the IAT or the MAF could cause a high frequency vibration, but it seemed to be almost like a relay was cycling extreamly fast, causing the high pitched frequency noise/whistle.
I'll have to wait until <20*F temps to see if its gonna do it again this winter.
Anyone else experience this ? ?
Usually stops immediately upon getting off the gas pedal, but one time it started doing it while it was idleing and I was still in the driveway. I jumped out and quickly opened the hood - the "whistle" was definetly coming from under the hood. I rested my hand on the air intake tube and it was doing this high frequency vibration thing that seemed to be in sync with the "whistle/noise". Just as I figured it might be in the air intake tube (between the air filter and the throttle body), it stopped making the noise and the vibration stopped.
I don't t-h-i-n-k the IAT or the MAF could cause a high frequency vibration, but it seemed to be almost like a relay was cycling extreamly fast, causing the high pitched frequency noise/whistle.
I'll have to wait until <20*F temps to see if its gonna do it again this winter.
Anyone else experience this ? ?
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New User
Joined: Feb 2003
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From: Portage, MI
I asked the dealership once and they said I'd have to bring it in for them to look at. (Like that'll ever happen with their ridiculous labor rates.) What it sounds like to me is an airflow issue of some sort. I thought maybe something to do with throttle body. I'm wondering if the throttle by wire throttle body design or the plastic intake manifold might have something to do with it.
Postmaster
Joined: Jan 2009
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From: Chesapeake, Va.
I asked the dealership once and they said I'd have to bring it in for them to look at. (Like that'll ever happen with their ridiculous labor rates.) What it sounds like to me is an airflow issue of some sort. I thought maybe something to do with throttle body. I'm wondering if the throttle by wire throttle body design or the plastic intake manifold might have something to do with it.
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Joined: Nov 2004
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Again, you need to check for vacuum leaks. The fastest, safest and easiest way to do a general check is to have the engine revving just above an idle and spray all of the seams and hose connections with WD40 while listening for a change in the rpm. When you hear a change you have found your leak.
I had a strange noise on a Ford Ranger that turned out to be a slight leak at the throttle body to intake manifold gasket. It was a hard plastic gasket that resonated like an instrument reed only at certain throttle positions.
Logistics Pro
Joined: Jan 2001
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From: Central NYS
Did it again!
Had just pulled into the restaurant parking lot when this wierd noise came from under the hood. Maybe its not a whistle, but maybe sounds more like a very weak stuck horn, sort of moaning sound. Temp outside was 32 degrees.
I popped the hood and jumped out to see if I could figure out where "the noise" was coming from before it stopped. It was coming from the square box thing in the intake tract between the MAF and the throttle body. It was a vibrating like a son-of-a-gun. Put my hand on the 'square box' to try and calm it down but it just kept on vibrating, very forcefully.
Soon as I turned the ignition key off it stopped instantaneously.
This is on my '02 Navigator 5.4 Inteck. I think it's intake tract is different from the 4.6's, which is also different from the 5.4 Triton.
Anyone else ever experience this?
Had just pulled into the restaurant parking lot when this wierd noise came from under the hood. Maybe its not a whistle, but maybe sounds more like a very weak stuck horn, sort of moaning sound. Temp outside was 32 degrees.
I popped the hood and jumped out to see if I could figure out where "the noise" was coming from before it stopped. It was coming from the square box thing in the intake tract between the MAF and the throttle body. It was a vibrating like a son-of-a-gun. Put my hand on the 'square box' to try and calm it down but it just kept on vibrating, very forcefully.
Soon as I turned the ignition key off it stopped instantaneously.
This is on my '02 Navigator 5.4 Inteck. I think it's intake tract is different from the 4.6's, which is also different from the 5.4 Triton.
Anyone else ever experience this?
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Fleet Owner
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How old is the air filter? If it's old, dirty, and clogging up, the airflow resistance is increasing. This could cause air to enter though other crevices and cause the whistling.
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Logistics Pro
Joined: Jan 2001
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From: Central NYS
Just as a way of clarification, I don't think of the sound as a whistle, but more like a weak horn. And the 'square box' is, well, maybe I should call it a 'buzzing' sound, and it vibrates like an old Model T coil (there I go, showing my age again!)
When I check the air filter I'll have to pull the intake tract off and see if there is something attached to it that would vibrate like a relay or something. Or see if I can find a pin hole or crevice that is letting air in.
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