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Hey guys, I'm at my wits end figuring out the issues of my car running lean... I should've made a video of a cold start, but this sums up the issue just as well. Cold start: Car runs around 10-11 AFR, then, after maybe 10 seconds goes far lean, 17-18. It usually comes back up when the car has been running for awhile. New o2 sensors, checked the CAS pin and timing, all injectors ohm perfect (1 year old Nismo 740cc), fuel pressure is good. Spark plugs are fouled but I wouldn't think that would matter, gapped to .035. New (updated version) Selin with 2 NEW N62 MAFs. New EFI harness. No codes, no boost leaks. Specialty Z off the shelf tune for e85. Now this might be a different issue, but it sure seems related to me: Under normal cruising speeds everything follows around 14.7 or so like it should. Under hard pulls and boost everything is pig rich (10-11 or so). BUT, if I creep into boost under about 3k rpms, the car fully leans out - As I get into boost, the a/f leans out more and more, directly following boost numbers. Obviously I back off as soon as I can. I asked Greg at SZ and he said it sounds like a leak before turbo or bad injectors, but I have ruled those out. Is there anything else? Electrical? Please help! video: https://youtu.be/xicMyEKmwlw
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