Experienced a very rich idle yesterday. 10-11:1 AFR. I'm tuned MAF only. The MAF activates at 400rpm. Is it switching from open and closed loop? How do I tell? I'm new to this and pretty much only adjust the MAF curve, mess with timing, and PE. Log and tune included. Current mods in sig for my Corvette.
2014 ZL1. Manual trans.
2011 Silverado 2500HD 6.0 gasser, 6 speed auto
I'm not an expert, and I can't see too much with the way my scanner is set up, but it looks like your STFTs are going way negative at some points. I'm thinking that MAF curve could use some work, but that's just a guess. I've gotten mine to where the STFT + LTFT average is very close to zero at pretty much all times.
If you haven't done this, you might want to set up a histogram for STFT vs. MAF frequency to see how close you are in certain ranges of the curve. I chose to keep my LTFTs enabled, and used STFT + LTFT (average) vs. MAF frequency to help dial mine in. Works great.
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