Just looking for suggestions on this engine noise. This is from cold start. This is fully warmed up.   This noise has me fully baffled. The truck has always been a little noisy. Just looking for thoughts of what I might be missing.  Backstory: The truck has always been a little noisy. Sometimes the noise will almost go completely away. Sometimes it sounds like something is trying to escape. With a mechanics stethoscope you can hear a tick everywhere o