3rd pin from the top right on one side looks to be marked as 4Y to me. On the other side, it is correctly marked as 4U. Anyone else have this problem on their board?
INJ2 should have been wired to 4Y and ended up at 4U.
INJ1 (cyl3, problem cyl) should have been wired to 4U and ended up at 4O (which looks like 4U when cut off) because I read "The injector at cylinder #1 is 4U" and thought INJ1 was 4U.
It was a perfect storm of events that made sense at the time. I can't believe it ran as well as it did. INJ1 must have been open or partially open and running super rich. I'm surprised the other cylinders aren't hosed from running so lean...
I found this problem by using the DIYPNP test mode with a multimeter (UniTrend UT61E) in duty cycle mode.
The timing mark no longer jumps around either. I think I will rewire the wideband since VBatt still wiggles when it's connected.
Made a quick run tonight and it was great, can't wait to dive into the details.
Thank you all for following.