Question about 2001 Ford Mustang

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My 2001 Mustang 3.8 makes a lot of noise at high speeds. Even at an idle, the noise is noticeable and seems to be coming from the alternator/pully area. I have replaced both items and the belt itsel

Replaced serpentine belt, replaced pulley next to alternator, and replaced the alternator

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  • Timllfixit Nov 18, 2014

    You just said its there at high speed and idle? How can it not be rpm related unless you mean you are still rolling along at idle and you can hear it? In which case listen under the hood when stationary, then try and determine if its speed related. Does it sound like worn out brakes/ something rubbing in the front end, wheel bearing etc. You have to think logically and check things in sequence. Get a buddy with car knowledge to have a listen. If its there when parked then its not speed related.

  • Sean Thomas
    Sean Thomas Nov 18, 2014

    The sound exists at idle, but it is not very loud. At high speed (50mph+) the noise sounds like you're in an airplane. It is not RPM oriented, because when I put the car in neutral at a high speed, the noise continues. The slower I get, the less noise I get.

  • Timllfixit Nov 18, 2014

    Therefore go back through my previous reply and look carefully at brakes, driveline etc. With reasonable care and 2 jackstands on the rear axle you could drive the car to some speed while listening for the noise. If its not there through the gears to 50+ then it must be in the front end. Back to my previous about bearings, brakes etc. Lift each front wheel in turn, spin by hand and see if that determines anything. Check the track rods, bearings, brake noise while you are there.

  • Timllfixit Nov 18, 2014

    If that doesn't get to the bottom of it then its down to something making a noise purely by passing through the air, like bodywork, electric cooling fan if it has one, some item that wind resistance is causing.



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You've looked at 2 things it drives, follow that round all units driven by the drive belt. Is it engine speed related? If so what can you hear under the hood when you rev up? If its not too difficult can you run the engine for a minute without the belt fitted. Don't run for long because of overheating. Listen then without all the bits rotating.

Posted on Nov 18, 2014

Testimonial: "It is not engine speed/RPM related. I will try it with the belt off. Thanks."


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