[eds2150]

Here what i have 2000 ford powerstroke.
I replaced #5 and 7 injectors because
it began to smoke heavy. Ford did a cyl compinsation test and 5 and 7 were low.
I replace 5 and 7 injectors. number 7 has a knock when it fires. So I took the valve cover off and started it. When i was running I disconected #7 injector ran with no knock. plug in back in and it knocks. It did not knock before i replaced the injectors. The #7 injector is fireing i even replaced the injectors it and when you plug it in the trucks rpm will increase. YOU can only hear the knock at low rpm or at a idle. runs good at high rpm. Sound omost like a knock when you fire a diesel engine up on starting Fluid and you used to much. Only on the number 7 cyl all the rest run great.
Fuel knock.

I just got the truck about a mouth ago, was the injector just not fireing when i got it so i never heard it?

If any one thinks they can help call me at 716 867 4031. I play with alot of engine. No one around hear can figure it out.