I'm stumped.. Bad IAC? Case learn? Checked for vacuum leaks with carb spray and there appear to be none.
I'm stumped.. Bad IAC? Case learn? Checked for vacuum leaks with carb spray and there appear to be none.
Seems like you have an o2 sensor issue on your hands.
Bank 1 is constantly rich and it's trying to yank fuel away while bank 2 shows that it's way lean and doing the opposite. Having one stuck at 900mv and the other at 50-100mv all the time is going to give you problems.
Swap sensors side to side, see if the problem switches sides. Check wiring.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
Yep..you were right...O2 sensors cross-wired. Bank 1 O2 reading bank 2 and Bank 2 O2 reading bank 1. I figured that was the problem..guess I should have checked it. My engine came with the PCM connectors chopped off the harness and I had to reconstruct the whole thing.
Also had a bad IAC valve, replaced that and rewired the O2 sensors and runs 4.0.
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