Breakup with light throttle + light load

[markoshust]

Things are running good, but it seems that when I am at light load (~2k) and light throttle, there is some slight breakup (I hear a 'pop' like its misfiring) and my a/f gauge reads lean. What could cause this? I tried switching various parameters but it appears nothing is helping.

Thanks,
Mark

[Matt]

Sounds potentially AFM related

Need more info... what car/engine, what AFM are you using, when did the problem start occurring, do you have log files with the injection time, rpm, AFRs etc

[markoshust]

240SX with KA24DE, PT5858E turbo, Ford Lightning 4" MAF, 75# Delphi injectors.

Runs great under boost. Has been happening since I got the turbo setup up and running.

Here is a log of the car at idle and slight cruising
http://shust.com/240sx/log_2011-08-06_2158_23.csv