Hondata

ive been having issues with my car stumbling at times, I was able to catch it on a datalog, the problem happens at the 2 minute mark through the 2:20 mark. the car is a 95 civic with a b20 swap, running the hondata b20 base map. can anyone tell me what might be causing this issue

It is the o2 sensor or something to do with the o2 sensor, like an air leak in the exhaust.
At the 2 minute mark you'll see the short term fuel trim goes to -29%. Without a wideband it is hard to say but I would think that is running lean at that point which causes the hesitation.

Thank you for the info, I was starting to plan towards that after looking at it a bit longer, could I get ride of the factory 02 sensor and just run a wideband?

Yes, you can replace the factory o2 sensor with a wideband and run closed loop from the wideband/

I had this same issue on my car today. Everything had been running good until I updated my smanager to the newest beta version and made changes to my launch control and uploaded the calibration. As I was driving, my short term fuel trim suddenly went down to like -20 and the car kept stumbling and not running correctly.

After looking over the calibration thoroughly, I noticed that my rev limit per gear had changed to 2500 across every cell. I had definitely not done this change myself. I think the calibration got corrupted or something of that sort had happened. What I did was opened a new calibration and copied over my ignition and fuel tables, etc. Gonna try it tomorrow and see if it fixes it.

You should try doing the same with a fresh calibration and see if it helps you. Good luck!

I've actually been having this problem for awhile, but recently it has gotten worse, when I went to hook my computer to my ecu is when smanger updated, but I will definitely look into what your talking about, originally I thought it was my aftermarket tps but I'm starting to think it's the 02 sensor like the admin suggested, I turned off the closed loop to see if that fixes the issue/eliminates 02 sensor

I ran on open loop for a week and didn't have an issue, then I changed it to closed loop and the issue came back