willie59
Administrator
If you still see the temp stay down at all on that rear cylinder, swap the injector with the front and see if it follows. Could just be a bad new/reman injector putting you through this.
I agree, that's the next thing I'd do. If it remains the same I suppose I'd next swap injection pump units. After that, with no compression test, I see head removal, could be a bent connecting rod, I've seen that happen on a 4-53 Detroit before