I had the O2 injection hose shortened so it would run straight up the side of the can to the quick disconnect. I added a 90 degree elbow so the hose wouldn't bow out like it does from the factory and I figure that when the new end was crimped on the small shaving was stuck inside the hose and it finally worked it's way out.
Here's a picture of the mod I did to the O2 QD.
