OK so I set up this account and am new to ecf mainly because of an odd issue with the TFV4 mini that has been bugging me, and I saw no comments that seem to help surfing other posts. I tried the atty on multiple different devices and the all threw some sort of error code relating to low ohms or shorting. So I did what you normally would do by pulling pins checking threaded connections, worn seals, ect.. still boned. Finally after pulling everything apart I got it to work. This happened on multiple coils from the tfv4 lineup so that's why I never looked over the coils to close, but the top lead on them was shorting to the threaded neck that enters the top of the coil. I'm not sure how many people have had this issue but with as many coil variations as the TFV4 no wonder. I bent the lead off the coil in towards the center and pushed it down some no issues now. This happened with multiple stock coils I freshly installed otherwise it wouldn't have confused me like this, hopefully it can help similar issues with Tfv4 coil defects.