Unstable AFR at cruise

rvtrcr · 10-23-2024, 11:57 AM

08 335i , MHD & JB4 - car just started this a few days ago. At cruise/constant throttle the AFR will swing a point, sometimes 1.5. No misfire or CEL. Anyone else seen this? Possibly a failing O2?

ChuckW · 10-24-2024, 06:05 PM

Is that the only thing changing? Watch your wastegate position when that happens. Maybe you have the JB4 menu 12 outside of it's suggested parameters?

dmckmc · 10-24-2024, 07:40 PM

Does the throttle oscillate with AFR swing?

10-23-2024, 11:57 AM	#1
rvtrcr Private 5 Rep 92 Posts Drives: '09 M3 Sedan Join Date: Sep 2015 Location: Dallas iTrader: (0)	Unstable AFR at cruise 08 335i , MHD & JB4 - car just started this a few days ago. At cruise/constant throttle the AFR will swing a point, sometimes 1.5. No misfire or CEL. Anyone else seen this? Possibly a failing O2?
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10-24-2024, 06:05 PM	#2
ChuckW New Member 12 Rep 17 Posts Drives: 2008 335xi Join Date: Sep 2022 Location: Jersey iTrader: (0)	Is that the only thing changing? Watch your wastegate position when that happens. Maybe you have the JB4 menu 12 outside of it's suggested parameters?
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10-24-2024, 07:40 PM	#3
dmckmc Private 57 Rep 94 Posts Drives: BMW 535i E60 (2008) Join Date: Dec 2021 Location: USA iTrader: (0)	Does the throttle oscillate with AFR swing?
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