Can anyone explain these waves in my AFR/STFT's? Steady state conditions....... Because the problem is they carry over to PE ..... 5-15% out on PE ...... Crazy.
I've tried setting the car back to stock using MAF/VE.... They are still there. Only really happened after Hi-Flow Cats. Tried everything to tune this out...... I'm stumped.
eg. Highway perfectly stable steady state condition (any tune, maf, mafless, stock transients, multiplied transients -impact factor only-...... stock throttle vs full response same deal)........ See pictures.... the waves are like 7-9% on average, complete steady throttle with no map movement etc.
You can see my VE is smooth, timing is smooth......... trims on a histogram are all within average +-3.... the cells beside the spikes on the photo are perfect virtually +-1 ...... but with the spikes the min maxes are quite massive. I'm wondering if it's like Idle airflow but it has a stock cam....
It has me stumped.... What am I missing here? Where do I need to look? I would have uploaded a scan but there's a file size limit on here.... I'll post my tune if necessary.