2009 chevy silverado 4.8l v8 crew cab 4x4
Got in my truck after work and started hearing a knocking noise. The noise seems to be every second and as the motor warmed up it wasn’t as loud at first.
I live about 4 min from work. By the time I was home it wasn’t loud. While trying to find the location of the noise with a stethoscope i noticed it louder on the passenger side near the top of the engine on the front coil pack. Also just noticed and it may have always been their but the intake makes a “poof” sound when the truck is turned off.