Noticed my AFRs were in the 12s yesterday. Now its consistent every WOT pull its around 12.4. It was always around 11.4 before i noticed this. I also noticed my idle is a little jumpy now.. no boost leaks. Any ideas? High volt fuel pump relay??

 

Could be a number of things, have you datalogged the car with EvoScan if you have it? I know if the MIVEC starts going haywire where Intake goes full advanced and exhaust goes full retarded you can get some very strange behaviour.

Definitely check your fuel system too and I wouldn't keep going WOT if it's doing mid 12's at more than 15 psi because you will likely start to get some knock and potentially do damage over the long term.

 

Well... my thoughts are that after i got tuned i fixed a small boost leak. Im tuned on high boost and i think me fixing my boos leak caused my car to run lean because it is now getting more boost and not enough fuel. Is this a possibility?