fuel system gurus needed

[coryf1233]

So my wideband reads really rich, like below 10 at wot,
at idle it reads 18 really lean, I figure i have a boost leak..

however my fuel trims read lean all the time

whats this all about?

 

[JayRolla]

Well first off stock AFR for wot on a dsm is around 9.5:1 so that is fine.

Now dont figure you have a boost leak because if you dont know than you most likely do. Do a test and fix all leaks. Make sure you o2 is ok because when you get stuck into open loop it will run lean at idle and rich during cruise.

 

[coryf1233]

well my o2 voltage seems to fluctuate alot, i thought it was suppose to cycle , but it drastically changes, and the other day one of my fuel trims was 199???? whats the deal with that, obviously its wrong but why