I have a 4WD 4Runner with 160K miles. Ever since about 40K miles, it's been making a high-pitched noise, and I'm interested in finding if anyone else has experienced the same problem. Here are some details about the noise:
* The noise seems to come from beneath the truck, possibly the transaxle area, or from the right front or rear wheel. It's difficult to localize.
* The noise only comes on when the car is moving at about 30 MPH or faster. Sometimes, the noise can only be heard when the car is coasting, at other times it can be heard continuously.
* However, the noise doesn't come on all the time. Sometimes, the car can go for days or weeks without the noise, and sometimes, the noise comes up right away. The weird thing is, sometimes, the noise would not be heard for a while. Then I would stop at a red light, and when the light turns green, the noise comes up when I start driving! There doesn't seem to be any rhyme or reason.
* The noise can be soft, like a bird chirping, or it can be howling very loud. Again, no rhyme or reason.
* External temperature or humidity doesn't seem to be a factor. The noise can come and go whenever it feels.
If you have run into the same phenomenon, please let me know if you have found out what the problem was, and how it was fixed. Thanks!
Thanks, Matt! I'm glad that I've finally found someone who had the same problem! I'll check out your suggestion right away!
If anyone else had the same issue but found a different source for the problem, I would appreciate any additional input as well! Thanks again, Matt!
* The noise seems to come from beneath the truck, possibly the transaxle area, or from the right front or rear wheel. It's difficult to localize.
* The noise only comes on when the car is moving at about 30 MPH or faster. Sometimes, the noise can only be heard when the car is coasting, at other times it can be heard continuously.
* However, the noise doesn't come on all the time. Sometimes, the car can go for days or weeks without the noise, and sometimes, the noise comes up right away. The weird thing is, sometimes, the noise would not be heard for a while. Then I would stop at a red light, and when the light turns green, the noise comes up when I start driving! There doesn't seem to be any rhyme or reason.
* The noise can be soft, like a bird chirping, or it can be howling very loud. Again, no rhyme or reason.
* External temperature or humidity doesn't seem to be a factor. The noise can come and go whenever it feels.
If you have run into the same phenomenon, please let me know if you have found out what the problem was, and how it was fixed. Thanks!
Thanks, Matt! I'm glad that I've finally found someone who had the same problem! I'll check out your suggestion right away!
If anyone else had the same issue but found a different source for the problem, I would appreciate any additional input as well! Thanks again, Matt!