Here’s 2 new videos. It sounds like it’s coming from underneath the truck.
https://youtube.com/shorts/0hN45UaUoT0?feature=share
https://youtube.com/shorts/6M78SHzp9sk?feature=share
I started it today and let it idle for a little while and I didn’t hear a thing. Reved the engine a little and still no noise. I changed my oil, and seen no discoloration or metal/shavings. I will check everything everyone said for sure.
I have 1997 GMC K1500 with about 260,000 miles. Today it started knocking, and I don’t know if it is the lifters or a piston slap. I don’t think it does it all the time, I heard it when I was stopped in traffic and when I took off I didn’t hear it anymore. Got home and parked it and I can hear...