Re: '03 E350 5.4 WTF is this noise? video included
well, here it is. This broken exhaust manifold bolt cam from the #1 cylinder top bolt. I put around 20 k miles on the truck since the noise started and I'm sure the bolt broke when the noise started. I put a wrench on the bolt and it was loose. After a few turns I pulled it out with my fingers. I immediately fired the truck up and the noise was GONE! After I narrowed it down to the exhaust manifold number one cylinder, but before I touched the bolt, I had a friend come over and listen to it. I told him what it was and he said I think you're going wrong with that and started talking about cams and junk. That's how much strange this noise sounded.