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      09-27-2022, 01:22 AM   #1
F06killa12
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F90 running lean?

Hey guys,

Recently my car has been running lean for some time on bank 2. i have eventuri intake, catless downpipes and csf charge coolers installed along with bm3 ots tune. However Since these cars don’t have MAF sensors, what could be the cause of this issue? My o2 sensor are operational, i check all possible air leak spots and tightened all clamps (intake and charge coolers) but i still keep getting the code every time i clear it. Any advice?
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      09-28-2022, 02:43 AM   #2
Hachima
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It may not have the best information, but if you haven't seen it yet https://f90.bimmerpost.com/forums/sh...=1679064sounds like the same issue.
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      09-28-2022, 06:26 AM   #3
pbonsalb
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Do you have the O2 feature engaged in the optional features in the BM3 tune? Might be automatic with Stage 2 tunes but I am not sure.
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      09-28-2022, 08:00 AM   #4
M5KEITH
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Is your car not tuned? If you add airflow to your motor without a tune could be your issue.
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      09-28-2022, 08:18 AM   #5
pbonsalb
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Quote:
Originally Posted by M5KEITH View Post
Is your car not tuned? If you add airflow to your motor without a tune could be your issue.
OP’s post says tuned with BM3 OTS tune.
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      09-30-2022, 05:41 PM   #6
F06killa12
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Quote:
Originally Posted by pbonsalb View Post
Do you have the O2 feature engaged in the optional features in the BM3 tune? Might be automatic with Stage 2 tunes but I am not sure.
I put the stock tune back but still smh
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      09-30-2022, 05:42 PM   #7
F06killa12
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Quote:
Originally Posted by M5KEITH View Post
Is your car not tuned? If you add airflow to your motor without a tune could be your issue.
It’s bm3 tuned
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      09-30-2022, 05:46 PM   #8
F06killa12
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I removed my exhaust to instal an xpipe. However i look inside the downpipes from underneath and I noticed bank 1 downpipe is black from inside but bank 2 downpipe is more like white, or i would say clean unlike bank 1. So clearly there’s something different between the 2 banks.
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      10-22-2022, 03:00 PM   #9
F06killa12
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The issue is fixed. My downpipe was loose from the turbo side and it was leaking.
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