I just picked up a 02 f350 and it wont start in the cold unless I plug it in. and when it does start it has no power and a real rough idle and some time lopes. I was gonna put new glow plugs and relay. how can I check my injectors?
Check voltage on your Glow Plug Relay to make sure it's functioning properly. You can ohm out your glow plugs. How cold is it where you are at? If you run synthetic oil in it, it will run a lot smoother on start ups in cold weather. The synthetic oil made a huge difference in my truck in the winter months. Also how many miles on your injectors?
"C" is just a common wire for the injectors and yes the "I" is for the injector. The pin is exactly as shown in the little "G" "I" "C" diagram, all the letters are for is so you know which wire does what. And in case you didn't know, the valve cover gaskets are reusable on our trucks, unless they're just completely visually destroyed.
Also inspect the undervalve cover harness for melted and/or frayed wires, that can also cause similar issues. While you've got the covers off, you may as well check the glow plugs too.
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