Finished my heads and cam swap about a week ago. I drove the car over to a friends house and all the afr's were looking good. I just did some minor tweaks to the ve table on the way and everything looked good. It was ideling for awile when all of a sudden the afr's started going lean. I tried adding more and more fuel and it was like it wasn't doing anything to the afr. I limped it home and started checking everything!

Here it is a week later and I have literally gone through it top to bottom. The car runs fine, idles fine, everything is good other then the fact that if I take it out of closed loop the thing just leans out and no matter how much I add to the ve table, it just wont correct it! Even in closed loop, the fuel trims are all over the place (lean). I have tried going into maf only mode and tried correcting the fuel that way to no success.

Im at a loss if solutions at this point and the only other thing I can think of is something in the ecu just let go if that's even possible for one to do this. I have searched and searched for vacuum leaks ect. And no dice.

Is there possibly a ground or something in the ecu that would cause this? any help is greatly appreciated! Has anyone else had a issue like this or am I in a boat by myself here? I have even tried putting the stock tune in and put it in openloop and same scenario.
Fuel pressure is rock solid at 58psi

 

Anyone?

 

If you were in SD mode and the IAT was really high that will cause it to go lean. It is caused by heatsoak on the IAT sensor.

 

No this happens no matter what IAT it's at.
A link to the log file and tune fiile can be seen here:
http://www.hptuners.com/forum/showthread.php?p=286644

 

Is it working now...?

 

dial in your MAF

In HP tuners histograms, set up your MAF to determine the commanded AFR and the percent you are off from the commanded.