Strange sound coming from under car? 2001 Mustang GT


New Member
Dec 17, 2019
So been having this strange "soft screeching" and scratchy sound (not the belt) coming from what it seems to be the underside, towards the middle of the car.

Not sure what can be causing this but it's just a constant sound that never changes in pitch or speed, and it's quite audible. It's driving me crazy. At first I thought maybe it
was something with the cats but car runs fine and doesn't have any CEL light/codes. Car only has 87K miles and is bone stock other than flowmaster mufflers.

You can hear the sound very clearly, it's almost like a "tssss...... TSSSSS..... tzzzz..... TZZZZZZ."

The video to the sound is down below.
Any help/feedback would be appreciated. Thanks.

Weird Sound coming from 2001 Mustang GT
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Active Member
Jun 17, 2018
Hard to say from the video, but I'd start by being suspicious of an exhaust leak, then the throw out bearing if a stick. Get a piece of garden hose or 3/4" heater hose as long as your arm plus four or so inches...hold one end to your ear and slowly move the other around all the exhaust pipe connections, transmission, and also do under the hood...sound radiates---the hose will conduct the sound to your ear helping you locate it. You can do a similar check with a long screwdriver, breaker bar, etc when looking for mechanical noises---touch one end to your ear or temple and the other to the mechanical item you wish to check---I do this for rocker arms, water pump, alternator, ac comp, ps pump, etc.

Other thoughts...since the car is stationary, it pretty much rules out anything aft of the spinning pieces in the transmission except exhaust...the input shaft on a manual shift, and the torque converter/input on an auto spin while in neutral, so give that area a listen. If the shield is off the lower front of the trans bellhousing, you may have picked up a piece of trash that is making the sound (remote, but possible) should be able to hear it with the hose. Additionally, if a manual shift, your throwout bearing may be getting noisy...make sure brakes are set and have someone push in and let out on the clutch pedal to see if it changes the sound (do not put it in gear while you are under it).

Oh, and listen to the fuel pump as well. Happy hunting!
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