2007 Sport Trac High Pitched Noise

[2007blacksporttrac]

Hello,

My 2007 Sport trac has this high pitched whistle at approximately 40mph. Sounds like a dog whistle. It sounds like it is coming from the right read but it’s hard to tell. Some history on the truck: new jasper tranny, new driveshaft, new rear diff, new rear cv axles, and more wonderful parts. The noise is brought on by cold weather. I don’t hear this noise during the summer months. The noise begins at 40mph and get louder and higher in tone until it is like someone flips and switch and I don’t hear it. It does not change with RPM, braking, weight transfer, or tranny in neutral. It is driving me absolutely nuts. Has anyone ran into this problem and know a solution?

 

[swshawaii]

Possibly the vacuum control valve? (Motorcraft YG360)

hissing sound

Started hearing a hiss/"shhh" sound coming from what sounded like the passenger side everytime I pushed the accelerator with light to medium pressure today. The more I press on the pedal, the louder it became until enough pressure was applied and the sound went away. It is loud enough to hear...

www.explorerforum.com

 

[BrooklynBay]

Welcome to this forum! Are any gaskets ripped by the windows, doors or the sunroof?

 

[2007blacksporttrac]

Possibly the vacuum control valve? (Motorcraft YG360)

hissing sound

Started hearing a hiss/"shhh" sound coming from what sounded like the passenger side everytime I pushed the accelerator with light to medium pressure today. The more I press on the pedal, the louder it became until enough pressure was applied and the sound went away. It is loud enough to hear...

www.explorerforum.com

Climate control - vacuum reservoir

Having a little issue with my climate control - everything works just fine but I'm getting a vacuum leak from under the dash when I load the engine. In neutral, I can rev the engine and no sound. Going down the road, when I give it gas I get a hiss. Was looking this morning and I noticed that...

www.explorerforum.com

Possible Air Leak on Passenger Front Window

Is this happening to anyone else? While I'm driving my passengers can hear what they describe as air coming in the window. I have ridden in the passenger seat and can hear the same thing. When it rains there's no water leak so I'm not sure what it could be. Does anyone know how to fix this...

www.explorerforum.com

I don’t believe so because the noise is coming from the rear of the truck and does not changed with rpm. Only wheel speed.

 

[swshawaii]

I don’t believe so because the noise in coming from the rear of wheel and does changed with rpm. Only wheel speed.

Sounds like it's "rotational noise" coming from the rear that changes pitch with speed. Having wheel bearings serviced or replaced was not mentioned in your original post. 2007-10 Sport Tracs have known past issues with front and rear wheel hub bearing failures.

 

[2007blacksporttrac]

Sounds like it's "rotational noise" coming from the rear that changes pitch with speed. Having wheel bearings serviced or replaced was not mentioned in your original post. 2007-10 Sport Tracs have known past issues with front and rear wheel hub bearing failures.

That’s funny you mention the bearings because I have replaced the front bearings and one rear hub/knuckle assy. I have not replaced the right rear hub/knuckle assy. I think that is the cause of the noise but I wanted to be sure before spending more money on this truck.