Injector louder than others
In my cold start thread I posted a vid of a clicking/clacking/knocking/tapping noise I was hearing in the cab. The noise was most noticable at crusie with no load on the engine.
I listened with a stethoscope and it seemed to be coming from the passenger side valve cover near the back. When I had the VC off to replace GPs I used the stethoscope with the engine running. The sound was heard the most on top of the back fuel injector. I unplugged the injector and the sound stopped. Now this injector is different from the others, the other 3 are black with Ford numbers, the back injector is Orange with a big R on it.
What do you guys think? Is this injector bad? Is something mechanically wrong in this cylinder? Or is this injector just really loud?