N54 idle surge / lean out

[bostons335i]

Hey guys ,

Had a fast question to see if anyone has had this issue happen to them. Intermittently my car will be idling fine then all of a sudden hiccup like a misfire , afr goes lean (up to 18s) runs a bit rough then all of a sudden a couple moments later fix itself and run like nothing ever happened. All the logs with my tuning on WOT are completely fine . I’m going to attach a log where I caught it , the only thing I see that’s off is that fuel trims get maxed out while it happens. I did see in some options of MHD that it has a “AFR oscillation fix” I’ve been trying to figure out what that actually fixes but cant really find anyone using it . Thank you in advanced !

Ryan

 

[bostons335i]

Additional information

Firmware	Interface	JB4_MAC_Address	TMAP_V	Learned_Ign	DWP	MethTriggerMode	FF	MethSafeMode	MethAdd	MethScale	MethPSI	E85_Setup	VFF_Offset	fuel_30	fuel_35	fuel_40	fuel_45	fuel_50	fuel_55	fuel_60	fuel_65	fuel_70	map6_15	map6_20	map6_25	map6_30	map6_35	map6_40	map6_45	map6_50	map6_55	map6_60	map6_65	map6_70
30/139//2	JB4 iOS 9915	3cc72d627a58	2.0	20.1	75	0	30	0	0	99	0.0	1	132	75	75	75	75	78	80	80	80	80	15.0	14.1	15.0	16.0	17.0	18.0	19.0	19.0	19.0	18.0	17.0	16.0

BoostSafety	PID Gain	AutoShiftRed	Fuel_OL	FUA	1st_limiter	2nd_limiter	3rd_limiter	Options	N20_TMAP	6CylMode	LastSafety	duty_15	duty_20	duty_25	duty_30	duty_35	duty_40	duty_45	duty_50	duty_55	duty_60	duty_65	duty_70	et_enabled	et_n1minrpm	et_n1maxrpm	et_n1ramprate	et_n1mingear	et_n1minadv	et_n1minafr
26.0	25	0	70	0	0.0	0.0	0.0	0	1	5	2	50	50	50	50	50	50	50	50	50	50	50	50	0	0	0	0	0	0.0	0.0

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[bostons335i]

Bump

 

[martymil]

Judging by your log there is no electronic that is logged or a fuel related problem.

Looks like one of your sensors might be taking a dump which are not logged, you'd have to monitor all the sensors with one of the bmw tools
to work out the issue.

MHD is a great tool when everything is running right and to diagnose basic problems but that's about it.

 

[bostons335i]

Judging by your log there is no electronic that is logged or a fuel related problem.

Looks like one of your sensors might be taking a dump which are not logged, you'd have to monitor all the sensors with one of the bmw tools
to work out the issue.

MHD is a great tool when everything is running right and to diagnose basic problems but that's about it.

Hey , any idea what sensor could be going bad? Going through the forums I’ve seen some similar symptoms be caused by a bad /weak throttle body .

Also which bmw program is most used to see everything ?

 

[martymil]

Insta or inpa,