Air/Fuel problem

[mistamacadamian]

My s13 is running very lean, 16-18 all through rpms. ITS NA, Im running it off a auto ECU and it is a 5speed, nismo exhuast no cats, apexi safc, eugo wide band, and short ram intake. Im wondering if anyone has had this problem and what to do? I have a manual ecu but my car was running like **** when i first swapped it to manual and the rpm gauge didnt work with the manual ecu in, so i left the auto one in. i will switch it again tomorrow to look for a difference, any help?

[Ligouri Rd]

Bad o2 sensor mabye driving the ecu to run the engine lean. What are your in/out settings on the SAFC, are you running any correction?

[neverlift]

what are your afc settings? make sure you dont have them negative..... most stock ka run RICH. Have you checked the ecu for codes?

[mistamacadamian]

only correction is on low throttle 1000rpms is at -6 just for idle. could it really be the auto ecu?? i dk what the diff is between the 2 ecu's, and no codes show up or anything. ill be plugging the manual ecu in today, only problem is i wasnt getting rpms, it wouldnt work. ill let you guys know thanks