hate to start a thread for a simple question. but what size is the stud that the pcm ground connects to the block. i dont have the nut that came off it and need to get one, none of my bolts laying around the house fit so i'm guessing its metric. anyone know?

 

Everything else is SAE so I'm in doubt the nut you need is metric. Gently try a 5/16, 3/8 and maybe a 7/16". I think the stud is coarse thread so it would be 18, 16 or 14 respectively on the pitch. I'll go out and check later today and report back if no one gives you a definitive answer.

 

ok ill try again maybe i had a fine thread nut in the wrong spot or something. right now i have it on my starter bolt