jmac96

I have a 2005 F-150 with 39000 miles. In the last couple of months it makes a whistling noise at about 2000 rpms when going down the highway. I don't think it is affecting performance, just annoying. Does anyone know what might be causing this?

 

Big Block Ford

Is this a turbocharged model as a turbo charger can make a whistling sound at certain rev's with the engine under slight load and if it is tubo'ed and you have not noticed it before then maybe you should have it checked.

__________________
Lance
71 429SCJ Mustang
BA Falcon XR6 Turbo
88 Ford Courier 4X4

jmac96

No I don't believe it is turbo charged. It is a 5.4 v8. How do I check if it is turbocharged?

Irish FX4

Its the alternator from what i have found out. Mine also does it when its cold out and like you it around 2000 rpm's when it does it.

Big Block Ford

Ok it wont be turbo'd. I wasn't sure if it was a diesel engine.

Irish may have the answer. Perhaps alternator or even the alternator drive belt maybe.

__________________
Lance
71 429SCJ Mustang
BA Falcon XR6 Turbo
88 Ford Courier 4X4

drifter28

it could be a rear wheel bearing.

Toba 2700

I have a 2004 SuperCrew with a 4.6l engine. The whistling noise happens usually when the temperature is below -6deg Celsius. I brought it into a Ford Dealer and they said it was a problem with the valve design and there was nothing he could do about it. Hardly a suitable answer. Has anyone gone to FORD directly with this?

bt11

i have a 04 5.4 new style and mine doesnt whistle. I live in Montana btw. Gets about -20 degrees out... At least I have never heard it. Maybe its just trucks made at a certain plant?

67roadwhale

My '01 whistles down the highway. It's the radio antenna.