- The car used to have a turbo,
- The greddy turbo was removed and taken back to NA, The car was retuned to NA, still had larger injectors, Greddy MAP sensor.
- Car ran fine for 2 + years,
- After track day had a short in the electrical system ( the accessory plug) that was repaired.
- Car ran fine for some time,
- Much later, the car began to buck under steady throttle at speeds around 60 mph
- Changed plugs, coil packs, fuel injectors.
- retuned the car, Still bucking.
- reloaded Kpro software, updated the base tune, retuned,
- THe bucking stopped but it developed an unsteady AFR with broad swings in AFR.
- Also developed a low throttle low RPM flutter and fluctuating AFR.
- Changed the MAP back to stock and retuned the car.
- Ran okay initially, however, the Broad swings in AFR redevelop and causes problems/ low AFR readings when starting from a standing start.
So, since it started bucking, several things have changed, to the best of my memory, the AFR issue began when the new base map tune was down loaded.
I have two theories,
1) The short damaged the KPRO and it needs to get fixed,
2) there is a a bad sensor somewhere causing swings in AFRs.
Three trips to the tuner and several parts later, its not yet fixed.......
1) I am not able to download the calibration from the ECU. I did not tune the car. I am not able to find the instructions that allow me to download from the ECU.
2) The current log I have is too large to upload,
3) the screen shot for the datalog that shows the problem is in my first post,
