DFSO problems
Posted: 2021 May 01, 12:00
Hello,
I've been chasing a stalling issue after using the latest CBAZA file. When I push the clutch in sometimes the engine would just die. I started logging to see if it was something obvious and I noticed that the LAMBSE would climb to 2.000 when I let off the gas and the car also felt like it was slowing down much faster. If I push in the clutch while the LAMBSE are at 2.000 the engine would die, if I push in the clutch while the LAMBSE are some normal value, the engine would return to idle. I compare the DFSO values to the ones on the previous CBAZA file and I noticed that there are two parameters that are different
- DFSO Lambse Commanded (LAMBDA) - DFSLAM (Decel Fuel Error), was 1.000 now it's 2.000
- DFSO Lambse Commanded - DFSLAM, was 0.000 now is 1.000
I also noticed that the car is really slow to recover from the DFSO and it almost feels like a have a dead pedal for a couple of seconds, sometimes the engine even pops. This is very pronounced when letting off to enter a turn and trying to apply gas for the exit. There is a distinct delay of when the power comes back on. This issue is not present if the LAMBSE values are somewhat normal (closer to 1.000).
Would returning the values to the previous tune eliminate this behavior?
I understand that DFSO is used to save fuel, and my car could use all the help it can get. I can barely muster 230 miles a tank driving like a normal human being. What would you recommend I try to keep DFSO active and improve the drivability?
Lastly, do I need to make sure DFSO is turned off when I'm logging to exclude false lean data? I know this is done in the GM world. - EDIT, I just looked at the OL/CL flag and I see that it's set at OL so I believe from the right ups that it should not affect the MAF logging.
I've been chasing a stalling issue after using the latest CBAZA file. When I push the clutch in sometimes the engine would just die. I started logging to see if it was something obvious and I noticed that the LAMBSE would climb to 2.000 when I let off the gas and the car also felt like it was slowing down much faster. If I push in the clutch while the LAMBSE are at 2.000 the engine would die, if I push in the clutch while the LAMBSE are some normal value, the engine would return to idle. I compare the DFSO values to the ones on the previous CBAZA file and I noticed that there are two parameters that are different
- DFSO Lambse Commanded (LAMBDA) - DFSLAM (Decel Fuel Error), was 1.000 now it's 2.000
- DFSO Lambse Commanded - DFSLAM, was 0.000 now is 1.000
I also noticed that the car is really slow to recover from the DFSO and it almost feels like a have a dead pedal for a couple of seconds, sometimes the engine even pops. This is very pronounced when letting off to enter a turn and trying to apply gas for the exit. There is a distinct delay of when the power comes back on. This issue is not present if the LAMBSE values are somewhat normal (closer to 1.000).
Would returning the values to the previous tune eliminate this behavior?
I understand that DFSO is used to save fuel, and my car could use all the help it can get. I can barely muster 230 miles a tank driving like a normal human being. What would you recommend I try to keep DFSO active and improve the drivability?
Lastly, do I need to make sure DFSO is turned off when I'm logging to exclude false lean data? I know this is done in the GM world. - EDIT, I just looked at the OL/CL flag and I see that it's set at OL so I believe from the right ups that it should not affect the MAF logging.