Strange Intermittent Commanded AFR Error/Issue

[4.great_cobra]

Hi all,

Running a 3Bar COS P59 ecu (DBW Throttle) on my turbo 4.8, and I'm getting an intermittent issue in which sometimes during a pull my computer will command an AFR that is either very low (like 8.4:1, and the engine essentially 2-steps) or approaches 0:1 and the engine will cut out for a second. Have any of you come across this issue before? I will attach the a couple logs with timestamps and the tune file.

To elaborate on my experience with the problem, the 8.4:1 AFR Cmd issue usually happens when rolling into the throttle and it stops the engine from accelerating any faster, almost like I'm hitting a 2-step rev limiter.

The issue where it commands 0.5:1 AFR is new, just experienced it today, and it happened mid-pull at WOT and essentially shut the engine off for about 2 seconds at 4500-ish RPM.

If anyone has any experience with this or any input on the matter I would greatly appreciate the help! Thanks in advance


Cobra 12-18-21 7875C Good Log Finally Except Electrical Gremlin.hpl Timestamps: 8:50, 9:07 & 9:13 (Commands 8.4:1 trying to roll into the throttle)

Cobra 12-19-21 7875C Log 3 Turned Up Cuts Out.hpl Timestamps: 15:21 & 21:08 (Commands 0.46:1 during pulls)

Cobra 12-11-21 Idle VE1 7875C-68.hpt (This is the current tune on the car for both of those logs, but it's been having some form of this issue for longer than I can remember, separated by tens of tune revisions)

[blindsquirrel]

This is a swap vehicle, right?

Looks like you have some stuff overlooked in the DTC list to clean up. Like, O2s are all disabled except for P1134/1154; P2119 is 'No Error Reported'? Why?; and there are a bunch of U codes for modules I suspect are no longer there but have been left at 'No MIL Light'. Also forgot to turn off BrakeTqMgt in System Options.

[4.great_cobra]

This is a swap vehicle, right?

Looks like you have some stuff overlooked in the DTC list to clean up. Like, O2s are all disabled except for P1134/1154; P2119 is 'No Error Reported'? Why?; and there are a bunch of U codes for modules I suspect are no longer there but have been left at 'No MIL Light'. Also forgot to turn off BrakeTqMgt in System Options.

Thanks for the heads up, this is a swap vehicle, I'll fix those things right away. I don't know a ton about what all I need to disable in the system options, just the basics for running in speed density with no narrow bands, I suppose I ought to look for a thread about those on the forums and do a once-over on my settings.