AFR question- car suddenly rich?

[toomanytoys]

I have the PRP software and have been tuning my 03 Cobra with it. After reading Dons book and using his guide I have been able to write a nice tune for my car. In the wot section I have the car commanding 11.5 afr and was able to verify it with the wideband. I have been running it like this for almost a year now.
Lately I have noticed my afr at wot go as rich as 10.6. What could cause this? Adaptive learning is turned off and I don't get on the car hard very often. Any advice here would be great. Thanks for looking

 

[cj428mach]

PCV system leak post blower??

 

[toomanytoys]

That line in the back of the blower? I have eliminated the oem pcv from the car. I have a an10 fitting in each valvecover with a braided line that runs to a catch can with a breather on it that's down in the fender. I will start with the line though. Thanks

 

[blown98riored]

Has the weather changed such as hotter/colder temps, winter/summer since u wrote the tune? What was the issue that the adaptive learning is kept off?

 

[decipha]

thats not uncommon with fuel changes

even different gas stations can have significantly different grade fuels they regard as e10-premium

Ive seen up to a 10% global swing in my fuel trims from just different stations alone, Ive observed this in my camaro, harley truck, and a few of my supercoupes, one in particular up the street from me apparently sells e30 as e10

 

[toomanytoys]

Adaptive learning is turned off as suggested in LaSotas book. The tune has been in the car for almost a year so yes there have been some weather changes. This sudden rich condition is only about two weeks old. I checked over the motor and haven't found any leaks on any lines.

Any ideas?

 

[decipha]

adaptives should NEVER be disabled, they can ONLY benefit the tune

 

[toomanytoys]

Ok. That's a start. I will enable the adaptive learning again