Having a hard time tuning off of the LT & ST fuel trims. I am not well versed in Dodge tuning, but have experience with GM & Ford. It seems like trying to tune using the narrowbands in this car is about pointless, there are random bank to bank discrepancies, in addition to the two biggest issues I'm facing below:
Issue 1: At idle the NB sensors are pinned rich, yet the trims are holding a positive value. Why are the NB sensors not responding to the rich condition and trimming fuel out to get to the switch point? In the snip below the total trim is +10% and the NB voltages are 882 & 822mv - and it will hang this way for as long as 10 minutes (at which point I give up).
Rich with Positive Trims.jpg
Issue 2: Somewhere around P Ratio .8 to 1.0 at part throttle the LTFT start swinging 30% or more. For example, if they are holding a +15% they will start radically swinging as far as -20% and back to +15% over and over and over. It is so dramatic you can feel it in the car big time.
LTFT Swinging.jpg
This is a customer car:
2005 Dodge Magnum
5.7 w/ Procharger & blower cam
Headers & full exhaust
80# injectors
1018-5 1.08.hpt