So I've been trying to tune this for a while on my LT1. My long term fuel trims are split and my short term fuel trims are fine at +/-5% of 128. My LTFTs are lean on the drivers side 130-145 range while the passenger side is rich at 115-120 range.

The splits were worse but I sent my injectors to get cleaned and now I'm at the above ranges. I've tried playing with all kinds of different things but I haven't really been able to get this problem fixed. I'm going to seafoam the car to see if I have any leaks which I'm not hearing or seeing. Anybody have any ideas of what else I can do to try to get this corrected?

 

I attached a graph of the trims so anyone who wants to check out what they look like can see.

 

How old are the O2s? Do you have access to a wideband to verify the narrowband O2s are reading properly?

 

O2s are only a few months old. that was one of the first things i changed when trying to fix this. I do have a wideband mounted in my y pipe.

 

Anybody else got any ideas?

 

exhaust leak before o2 sensors, inlet manifold leak on one bank, misfire on one bank (plug or leads),uneven flow rates on injectors.