I have a 4.8 sierra and want to go single turbo (ideally closed loop) by my state (Maryland) has a OBD based emissions. Is anyone runing MAF or closed loop SD with with emissions readiness working? Or are their certain MILs I can disable but still pass?
Leave the MAF installed when you run through emissions and it should be just fine. If you failed the MAF within the tune and have it removed it's always going to trip at least 1 DTC code and you likely won't pass.
If you still have the rest of the emission stuff installed like the EVAP and primary o2 senors it should pass. The rear o2 sensor codes can be turned off and the cat test and rear o2 sensor test can be disabled within the tune. Would be something you'd likely have to get a few drive cycles in so the readiness monitors can get to ready.
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.
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