Thank you Noobz for the analysis of the logs. My initial response;
1. I'll keep the current NA tune unchanged pending any discovery of the fuel trim imbalance.
2. Wideband gauge in car and value displayed on log screen are not identical but average a difference of about .1 with the gauge in the car reading .1 richer. The gauge and the log parameter are both set for gas.
3. O2's were replaced as a new pair in 2014 and approximately 20k miles ago. Bosch 13942 is the part number.
4. I will check O2 wiring for any concerns and correct if needed.
5. I will check for exhaust leaks at the noted locations and correct if needed. (none known at the time of this writing)
6. I will check for vacuum leaks and correct if needed. (none known at the time of this writing)
7. I will check ignition components and spark plugs. I'll photograph plug coloration and post pictures. Plugs are new 3923's
8. I will monitor the bank difference for any future changes and compare to existing log data.
9. If I dont find any intake or exhaust leaks, the first thing I might do is swap the O2's side to side and see if the imbalance follows.
10. If all else does not identify a condition that would explain the imbalance, I will send the injectors out for servicing.
One question at this point. Is it possible that the combo under this new tune needs some additional time to settle in where it may report more balanced fuel trims after adequate time?
Thanks, John D
1. I'll keep the current NA tune unchanged pending any discovery of the fuel trim imbalance.
2. Wideband gauge in car and value displayed on log screen are not identical but average a difference of about .1 with the gauge in the car reading .1 richer. The gauge and the log parameter are both set for gas.
3. O2's were replaced as a new pair in 2014 and approximately 20k miles ago. Bosch 13942 is the part number.
4. I will check O2 wiring for any concerns and correct if needed.
5. I will check for exhaust leaks at the noted locations and correct if needed. (none known at the time of this writing)
6. I will check for vacuum leaks and correct if needed. (none known at the time of this writing)
7. I will check ignition components and spark plugs. I'll photograph plug coloration and post pictures. Plugs are new 3923's
8. I will monitor the bank difference for any future changes and compare to existing log data.
9. If I dont find any intake or exhaust leaks, the first thing I might do is swap the O2's side to side and see if the imbalance follows.
10. If all else does not identify a condition that would explain the imbalance, I will send the injectors out for servicing.
One question at this point. Is it possible that the combo under this new tune needs some additional time to settle in where it may report more balanced fuel trims after adequate time?
Thanks, John D
