So I'm hanging a chandelier at a friends house yesterday and he has a C7. After hanging it, he asks me to take a look at his tune because he keeps going into limp mode( 416 with a YSi-v7, large VT cam, headers,meth) so I'm thinking P0068 which was one of the codes and needed to be set higher. Has a ton of other codes in it. Come to find out some of his wiring was damaged by a header install.
Anyways got that taken care of. Now I have never messed with or tuned a car on meth injection so I was curious to see what the tune looks like. Is it normal for your fuel trims, at idle to be a constant ~12+ with your LTFT's tuned out?
Sat there idling for 20 minutes and that's where they sat the whole entire time. His O2's are working but sluggish( location), he has all 4. His trims at idle never went below 10+.