Need Help Identifying Noise

https://youtu.be/duvlZpzHlrc
Attached is a YouTube video of the issue, this noise just started yesterday (09172022), i contacted my father who is a life long mechanic and currently works at a dealership and he says it might be either the timing belt/serpentine belt, pully. In the video I am parked and just revving the engine in the beginning and at the end it is a constant rev. Any ideas or experiences with this issue?

Information with my vehicle- 2018 TRD Off Road 4x4, bought it less than 20 days ago w/ 65K miles, I take it off a few times a week nothing crazy just a few sand trails and dunes.

 

I agree with Dad. That sounds like a belt or pulley.

 

^

 

spray some water on the belt while its running. does the sound go away?

mine sounded simlar. a belt change fixed it. super easy too.

 

Your 2018 Tacoma has a timing chain (not a timing belt).

https://support.toyota.com/s/article/Does-my-vehicle-have-7690?language=en_US

What I do is put a long PVC pipe around areas I think the noise is coming from (with my ear at the other end) to see if I can isolate the location. Keep the PVC pipe from touching any moving parts like belts or pulleys.

 

I would bet all of my Star Wars collection that it's a bad/loose belt. Except for Boba Fett. No matter how right I am, I never bet the Fett-man.

 

If you determine it is the Serpentine Belt, here is a video of a guy changing the belt on a 3rd Gen. He leaves the video running in real-time so you can see how long it took him to change the belt.

https://www.youtube.com/watch?v=sv5fAcT0JAY&t=11s

 

yep, definitely a task anybody can tackle. I am no mechanic and I was able to do it in 35mins. Getting the belt around the fan blades was the 'hardest' part for me. I kept my old belt as an emergency spare to keep in the truck.