Datalog Massive variance in STFT

Vtecnet

Lurker
Sep 20, 2021
14
7
0
Looking at older logs, mine used to do this on DCEL, ie the AFR shoots upto 234.95 which is normal on MHD.

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However, it now looks like this..

1656824731221.png



The question now is, where to start.
The AFR looks normal on logs but massive variance with STFT
At cruise the STFT and AFR looks normal.
 

wheela

Lieutenant
Jun 4, 2021
1,113
621
0
Twin Cities, MN
Ride
2015 e84 X1 35i Msport
Do you have any logs with ltft logged? On those deceleration pics, the second one doesn't look right to me? Everything i've read, and seen on my own car is that afr should shoot up to 235 on decel due to fuel cut. That's actually a way to check for leaky injectors - do a decl like that, and if afr doesn't go up to 235 it's an indicator of leaky injector(s).

But I haven't had any leaky injectors myself. Not sure if there are any scanarios where it shouldn't shoot up to 235? Do you have burbles enabled? I don't use burbles, so I don't know if that could be related or not.