Okay guys. My 02 is giving me the run around with a knocking sound. Everyone swears it is an injector stuck open and what I was hearing was fuel knock (loud). I have done a lot looking to fix this sound. I can unplug the #3 injector and the knock goes 70% away. Unable to really hear if from an open valve cover or the top of the motor. Plug it back in and the sound comes back to full volume. It seems like I have narrowed to cyl #3 but NOT the injector (replaced it anyway...twice). It isn't loud enough to be a rod knock (doesn't sound like someone hitting the engine with a hammer...) What can be my problem when there is combustion the noise is louder than when there is no fuel being added to that cyl???? Anything will help. Probably have tried it but?